B406-4
EMERGENCY LOCATOR TRANSMITTER
Description, Operation, Installation and Maintenance Manual
This manual includes data for the equipment that follows:
Component
Emergency Locator Transmitter 453-5004 B406-4
Part No. Model No.
ACR ELECTRONICS, INC / ARTEX PRODUCTS
5757 Ravenswood Rd, Ft. Lauderdale, FL 33312
25-62-03
Cage Code: 18560
Page 1 of 87
570-5004 Rev. H
Initial Issue DEC 02/1999
ACR ELECTRONICS, INC / ARTEX PRODUCTS
DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
B406-4 (453-5004)
PROPRIETARY INFORMATION
This document contains proprietary information and such information may not be disclosed to others for any
purpose, nor used for manufacturing purposes without written permission from ACR Electronics.
Information in this manual is subject to change without notice. ACR Electronics makes no warranty, expressed
or implied, with regard to this manual, including but not limited to any implied warranties of merchantability,
fitness for a particular purpose, and non-infringement. In addition, ACR Electronics makes no warranty with
regard to the documentation or data contained herein. ACR Electronics is not liable in the event of incidentals,
special, consequential, or any other damages in connection with or arising from furnishing, performance, or
use of this manual.
Reproduction of this publication or any portion thereof by any means is prohibited. for further information contact Sales, ACR Electronics, 5757 Ravenswood Rd, Fort Lauderdale, FL 33312. Telephone (954) 981-3333
AIRWORTHINESS LIMITATIONS
The Airworthiness limitations section is FAA approved and specifies inspections and other maintenance
required under 14 CFR§ 43.16 and 91.403, unless an alternative program has been approved.
IMPORTANT NOTICE
ACR Electronics will be responsible for full distribution and revisions of ICA’s (Instructions for Continued
Airworthiness) For inquiries regarding the content and currency of this manual, contact ACR Electronics,
5757 Ravenswood Rd, Fort Lauderdale, FL 33312. Telephone (954) 981-3333
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B406-4 (453-5004)
RECORD OF REVISIONS
REV NO. DCN NO. DCN DATE REV NO. DCN NO. DCN DATE
- RELEASE Dec 02/1999
A ECO 1418 Jun 22/2000
B DCN 1641 Apr 11/2001
B DCN 1747 Jul 19/2001
B DCN 1965 Apr 04/2002
B DCN 2115 Dec 10/2002
B DCN 2356 Feb 11/2004
C DCN 2968 Mar 20/2007
C DCN 3174 Feb 26/2008
C DCN 3282 Aug 25/2008
D DCA W9414 Apr 06/2010
E ECO 14756 Jul 28/2011
F ECO 15177 Aug 27/2012
G ECO 15330 Mar 1/2013
H ECO 15410 Jun 20/2013
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SERVICE BULLETIN LIST
SERVICE
BULLETIN NO
ISSUE
DATE
SUBJECT
MANUAL
REV NO
MANUAL
REV DATE
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LIST OF EFFECTIVE PAGES
SUBJECT PAGE DATE SUBJECT PAGE DATE
Title Page 1 Aug 27/12 Description and Operation 30 Aug 27/12
Notices 2 Aug 27/12 (cont.) 31 Aug 27/12
Record of Revisions 3 Aug 27/12 32 Aug 27/12
4 BLANK 33 Aug 27/12
Service Bulletin List 5 Aug 27/12 34 Aug 27/12
6 BLANK 35 Aug 27/12
List of Effective Pages 7 Aug 27/12 36 BLANK
8 Mar 1/13 Test and Fault Isolation 37 Aug 27/12
Table of Contents 9 Aug 27/12 38 Aug 27/12
10 Aug 27/12 39 Aug 27/12
11 Aug 27/12 40 Aug 27/12
12 Aug 27/12 41 Aug 27/12
List of Figures 13 Aug 27/12 42 Aug 27/12
14 BLANK 43 Aug 27/12
Introduction 15 Aug 27/12 44 Aug 27/12
16 Aug 27/12 45 Aug 27/12
17 Aug 27/12 46 Aug 27/12
18 Aug 27/12 47 Aug 27/12
19 Aug 27/12 48 Aug 27/12
20 Aug 27/12 49 Aug 27/12
21 Aug 27/12 50 Aug 27/12
22 Aug 27/12 Removal 51 Aug 27/12
23 Aug 27/12 52 Aug 27/12
24 Aug 27/12 53 Aug 27/12
25 Aug 27/12 54 BLANK
26 BLANK Installation 55 Aug 27/12
Description and Operation 27 Aug 27/12 56 Aug 27/12
28 Aug 27/12 57 Aug 27/12
29 Aug 27/12 58 Aug 27/12
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SUBJECT PAGE DATE SUBJECT PAGE DATE
Installation 59 Aug 27/12 Appendix A 77 Aug 27/12
(cont.) 60 Jun 20/13 78 Aug 27/12
61 Aug 27/12 Illustrated Parts List 79 Aug 27/12
62 Aug 27/12 80 Aug 27/12
63 Aug 27/12 81 Aug 27/12
64 Aug 27/12 82 Aug 27/12
65 Aug 27/12 83 Aug 27/12
66 Aug 27/12 84 Aug 27/12
67 Aug 27/12 85 Aug 27/12
68 Aug 27/12 86 Aug 27/12
69 Aug 27/12 87 Aug 27/12
70 Aug 27/12
71 Aug 27/12
72 Aug 27/12
73 Aug 27/12
74 Aug 27/12
75 Aug 27/12
76 Aug 27/12
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TABLE OF CONTENTS
RECORD OF REVISIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
SERVICE BULLETIN LIST. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
LIST OF EFFECTIVE PAGES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
LIST OF FIGURES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
INTRODUCTION
1. Manual Usage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
A. General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
B. Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
2. Model Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
A. B406-4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
3. Approvals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
A. B406-4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
B. Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
C. RTCA DO-160D Compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Table 1 Environmental Categories Breakdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4. Frequency Allocations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
A. Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
B. Discussion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
5. List of Acronyms, Abbreviations, and Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
6. References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
A. Regulatory Documents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
B. Other Documents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
DESCRIPTION AND OPERATION
1. Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
A. Functional Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
B. Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
2. Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
A. Operational Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
B. Normal Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
C. Manual Activation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
D. ELT Reset. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
E. Functional Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
3. Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
A. Environmental and Physical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Table 2 Environmental and Physical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
B. Electrical. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Table 3 Electrical Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
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C. Antennas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Table 4 Antenna Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
TEST AND FAULT ISOLATION
1. Inspection and Test Regulatory Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
A. United States . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
B. Canada . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
C. Other Countries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
2. Inspection and Test Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
A. Checklist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Table 5 ELT Inspection and Test Checklist39
B. Preparation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
C. Coax Cables and Wiring Connections Inspection – Item 1 . . . . . . . . . . . . . . . . . . . . . . . . . . 39
D. Mounting Tray and Hardware Inspection – Item 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
E. Battery Pack Inspection – Item 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
F. G-Switch Functional Check – Item 4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
G. Performance Testing Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
H. 121.5 MHz Frequency Measurement – Item 5a . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
I. Audio Modulation Check – Item 5b . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
J. 121.5/243.0 MHz Power Output Measurement – Item 5c . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
K. 406 MHz Frequency Measurement – Item 5d . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
L. 406 MHz Power Output Measurement – Item 5e. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
M. Current Draw Test – Item 5f . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
N. Digital Message Verification – Item 5g . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
O. ELT Reset Check – Item 5h . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
P. Installed Transmitter Test – Item 6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Q. Antenna Test – Item 7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
R. Inspection and Test Documentation – Item 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
3. Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
A. Self-Test Error Troubleshooting Guidelines. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Table 6 ELT Self-Test Error Codes Troubleshooting Guide . . . . . . . . . . . . . . . . . . . . . . . . . 50
B. ELT Troubleshooting Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Table 7 ELT Troubleshooting Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
REMOVAL
1. ELT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
A. ELT Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
2. Battery. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
A. Battery Pack Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
3. Material or Equipment Return . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
A. Shipment Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
B. Return Material Authorization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
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B406-4 (453-5004)
INSTALLATION
1. Regulatory Requirements and Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
A. TSO C126, Paragraph D . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
B. FAA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
C. Canada. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
D. Other Countries. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
E. RTCA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
2. Mounting Tray. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
A. Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
B. Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
3. Antenna . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
A. Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
B. Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
C. Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
4. Remote Switch Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
A. Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
B. Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
5. Buzzer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
A. Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
B. Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
6. Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
A. General Considerations and Recommendations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
B. Remote Switch Panel Harness Fabrication and Installation . . . . . . . . . . . . . . . . . . . . . . . . . . 65
C. Buzzer Wiring Fabrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
D. ELT 12-Pin Receptacle Wiring Fabrication and Installation . . . . . . . . . . . . . . . . . . . . . . . . . . 68
E. Coax Cables Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
F. Antenna Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
G. Airframe Ground Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
H. Buzzer Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
I. Remote Switch Panel Final Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
7. ELT Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
A. Installation and Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
B. Harness ELT Receptacle Sealing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
C. Installation Documentation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
8. Battery Pack Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
A. Battery Reinstallation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
B. New Battery Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
APPENDIX A – ELT REGISTRATION
1. Background Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
A. Hex ID Code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
B. Reason for Registration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
C. Registration Information Resources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
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2. Registration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
A. Responsibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
B. Required Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
C. Where to Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
ILLUSTRATED PARTS LIST
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
A. Purpose . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
B. IPL Usage Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
2. Manufacturer Name and Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
A. Ordering Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
3. Explanation of Detailed Parts List Entries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
A. Fig # & Item Column. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
B. Part # Column . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
C. Nomenclature Column . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
D. UPA (Units Per Assembly) Column . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
4. Detailed Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
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LIST OF FIGURES
Figure 1. B406-4 ELT and Mounting Frame Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Figure 2. Remote Switch Panel Assembly Front View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Figure 3. Buzzer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Figure 4. Battery Pack Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Figure 5. Antennas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Figure 6. ELT Operational Flow Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Figure 7. Performance Testing Equipment Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Figure 8. Current Draw Test Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Figure 9. Short and Long 406 MHz Message Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Figure 10. ELT Removal Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Figure 11. Battery Pack Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Figure 12. B406-4 ELT Outline and Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Figure 13. Typical Mounting Tray Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Figure 14. Rod Antenna 110-320 and Blade Antenna 110-328-01 Outlines and Dimensions . . . . . . . . . . . 60
Figure 15. Blade Antennas 110-333 and 110-337 Outlines and Dimensions . . . . . . . . . . . . . . . . . . . . . . 61
Figure 16. Blade Antenna 110-337-11 Outline and Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
Figure 17. Remote Switch Panel Assembly Outline and Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
Figure 18. Buzzer Outline and Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
Figure 19. Remote Switch Panel Harness Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
Figure 20. Remote Switch Panel Harness Wiring at ELT End . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
Figure 21. ELT Installation Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
Figure 22. Battery Pack Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
Figure 23. Battery Pack Retaining Screw Tightening Pattern . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
ILLUSTRATED PARTS LIST
Figure 24. B406-4 ELT Main Assembly and Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
Figure 25. Electrical Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
Figure 26. Antennas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
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1. Manual Usage
SUBTASK 25-62-03-990-001
A. General
(1) This manual describes the operation, installation, and maintenance of the Model B406-4
emergency locator transmitter (ELT). The information is provided to ensure initial and
continued airworthiness. Information presented in this manual is accurate at time of printing,
but is subject to change. Refer to the Artex products web site at www.acrartexcom for the
latest information and any updates to this manual.
(2) Information on COSPAS-SARSAT emergency locator beacon registration requirements and
procedures is provided in Appendix A – ELT Registration on page 77.
B406-4 (453-5004)
INTRODUCTION
(3) Web links provided in this manual were accurate at time of printing but may be subject to
change.
(4) ACR Electronics reserves the right to add approved components to the ELT system; including,
but not limited to antennas, remote switch panels, and coaxial cables.
(5) Regulatory references contained herein are generally confined to United States and Canadian
requirements and, in any case, should not be considered all encompassing. Consult your
national aviation authority for applicable requirements.
SUBTASK 25-62-03-990-002
B. Application
(1) This manual constitutes supporting data/documentation for the B406-4 ELT, including:
(a) Description and Operation
(b) Test and Fault Isolation (includes inspection criteria)
(c) Removal
(d) Installation
(e) Registration
(f) Illustrated Parts List
(2) In the United States, the B406-4 ELT must be installed and maintained in accordance with the
requirements herein and 14 CFR, FAR Parts 43, and 91; and other airworthiness requirements,
as applicable.
(3) In Canada, the B406-4 ELT must be installed and maintained in accordance with the
requirements herein and Canadian Aviation Regulations (CAR), Part V, Paragraph 551.104 and
other CAR airworthiness requirements, as applicable.
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(4) B406-4 ELT installation and maintenance in all other countries must comply with the
requirements herein and applicable national airworthiness requirements.
(5) The accessories (i.e., remote switch panel and antennas) addressed in this manual are the
accessories most commonly associated with the B406-4 ELT. Other options, such as a
different remote switch panel configuration or an ELT/NAV Interface -B, should be installed
and maintained in accordance with the written instructions specific to the accessory.
NOTE
: Contact ACR Electronics for optional accessories approved for use with the B406-4
ELT.
(6) To ensure proper operation, only parts listed in the Illustrated Parts List of this manual or
those recommended by ACR Electronics may be used as replacement parts for the B406-4
ELT.
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2. Model Description
SUBTASK 25-62-03-990-001
A. B406-4
(1) The B406-4 is a type AF (Automatic Fixed) ELT, which transmits on 121.5, 243.0, and 406
MHz.
(2) The ELT is enclosed within a multi-piece mounting frame consisting of a mounting tray
assembly, protective top cover assembly and mounting frame cap assembly.
(3) When ordered as a system, an installation kit, cockpit remote switch panel, coax cables,
audible buzzer, and dual input antenna are provided.
B406-4 (453-5004)
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3. Approvals
SUBTASK 25-62-03-990-001
A. B406-4
(1) FAA TSO C126, Type AF
(a) The conditions and tests required for TSO approval of this article are minimum
performance standards. It is the responsibility of those installing this article either on or
within a specific type or class of aircraft to determine that the aircraft installation
conditions are within TSO standards. TSO articles must have separate approval for
installation in an aircraft. The article may be installed only if performed under 14 CFR
Part 43 or the applicable airworthiness requirements.
(2) Transport Canada - Type Certificate Data Sheet AP-47 Issue 2
(3) Industry Canada - Certification Number 1215873110AF
B406-4 (453-5004)
(4) JTSO-2C126
(5) COSPAS-SARSAT - Certificate No. 112 or 170
SUBTASK 25-62-03-990-002
B. Battery
CAUTION
SUBTASK 25-62-03-990-003
C. RTCA DO-160D Compliance
: LITHIUM BATTERY SAFETY CONCERNS INCLUDE THE POSSIBILITY OF FIRE, VENTING
VIOLENTLY, AND VENTING OF TOXIC GASES.
(1) The lithium battery pack used on the B406-4 ELT is certified under TSO C142.
(a) The conditions and tests required for TSO approval of this battery are minimum
performance standards. It is the responsibility of those desiring to install this battery in a
specific type or class of aircraft to determine that the aircraft installation conditions are
within the TSO standards. The battery may be installed only if further evaluation by
applicant documents an acceptable installation and is approved by the Administrator.
(1) DO-160D Environmental Categories: C1-BA204XRXXXXXZAZZ204BXXX
(2) The DO-160D environmental categories breakdown is detailed in Table 1 on page 19.
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Table 1 Environmental Categories Breakdown
CATEGORY SECTION DESCRIPTION
C1 4.0 Temperature/Altitude
- 4.5.4 In-Flight Loss of Cooling
B 5.0 Temperature Variation
A6.0 Humidity
204 7.0/8.0 Operational Shock and Crash Safety/Vibration
X 9.0 Explosion
R 10.0 Waterproofness
X 11.0 Fluids Susceptibility
X 12.0 Sand and Dust
X 13.0 Fungus
X 14.0 Salt Spray
X 15.0 Magnetic Effect
Z 16.0 Power Input
A 17.0 Voltage Spike
Z 18.0 Audio Frequency Susceptibility
Z 19.0 Induced Signal Susceptibility
204 20.0 Radio Frequency Susceptibility
B 21.0 Emission of RF Energy
X 22.0 Lightning
X 23.0 Lightning Direct Effects
X 24.0 Icing
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4. Frequency Allocations
SUBTASK 25-62-03-990-001
A. Application
(1) This section addresses the 406.0-406.1 MHz transmitter window and the specific frequency
band allocations residing above 406.025 MHz, beginning with 406.028 MHz, which are
assigned or reserved within the 406.0-406.1 MHz distress frequency window.
SUBTASK 25-62-03-990-002
B. Discussion
(1) The 406 MHz transmitter frequency of the B406-4 ELT was originally 406.025 MHz. In order to
comply with COSPAS-SARSAT frequency allocation requirements, changes to the 406 MHz
frequency may occur since the original release of this product.
(2) While the original B406-4 ELTs covered by this manual transmit on 406.025 MHz, current
B406-4 ELTs may not. The product identification label on each ELT specifies the transmitting
frequencies of the individual ELT. The 406 MHz component may be 406.025, 406.028,
406.037 MHz, etc. Allocation of frequencies, based on beacon population per specified
frequency band, is controlled by COSPAS-SARSAT.
B406-4 (453-5004)
(3) The frequency references throughout this manual for the 406 MHz component should be
considered the baseline and the specific frequency indicated on the ELT product label should
be substituted if it differs from 406.025 MHz.
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5. List of Acronyms, Abbreviations, and Definitions
SUBTASK 25-62-03-990-001
Term
AC Advisory Circular – A Federal Aviation Administration (USA) bulletin
AWG American Wire Gauge – An electrical wire diameter standard. Look for
BNC CONNECTOR A very common type of coax cable connector having a 50 imped-
CAR Canadian Aviation Regulations – The rules and regulations governing
CFR Code of Federal Regulations – The general and permanent rules pub-
CONTAINER The term “Container”, within the context of this document, refers to a
Definition
with special information. For the purposes of this document, the acronym AC does not refer to electrical alternating current.
this acronym in front of or following a wire size number.
ance and used for RF signal connections.
the manufacture, certification, operation, maintenance, and alteration
of aircraft in Canada.
lished in the Federal Register by the executive departments and
agencies of the Federal Government. Title 14, “Aeronautics and
Space” contains the FARs.
device designed to suppress RF signals, such that the broadcast of an
ELT placed in the container cannot reach the SAR satellite system.
COSPAS-SARSAT The international search and rescue consortium that governs the
international satellite-based search and rescue distress alert detection
and information distribution system. For a complete description go to
the official web site for the International COSPAS-SARSAT Program.
DER Designated Engineering Representative – An individual qualified and
designated by the FAA to approve, or recommend approval, of technical data to the FAA.
DRIP LOOP Extra wire length used to form a U-shaped bend in a wire or cable.
Water or other fluids will flow down to the bottom of the loop and
drip off. Electrical connections are made at the top of the loop.
ELT Emergency Locator Transmitter – ELTs are installed on aircraft and
used to send emergency signals to the SAR satellite system. The
word “Beacon” is associated with these devices.
EMI Electromagnetic Interference – An undesirable disturbance that
affects an electrical circuit due to either electromagnetic conduction
or electromagnetic radiation emitted from an external source. Also
called radio frequency interference or RFI.
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EUROCAE European Organization for Civil Aviation Equipment – EUROCAE docu-
ments are widely referenced as a means of compliance to European
Technical Standard Orders (ETSOs) and other regulatory documents.
FAA Federal Aviation Administration – The United States government
agency for aircraft safety and regulation.
FAR Federal Aviation Regulations – The rules and regulations governing
the manufacture, certification, operation, maintenance, repair, and
alteration of aircraft in the United States.
FORM 337 FAA Form 337 is required anytime a major repair and/or major alter-
ation is performed on an aircraft. Refer to FAR, Part 43, Appendix A
and the definitions of Major Repair/Alteration contained in FAR, Part 1
for guidance.
FSDO Flight Standards District Office – FAA district offices responsible for
aircraft certification, operation, maintenance, and modification issues,
approvals and enforcement.
G-SWITCH A velocity switch that detects sudden de-acceleration and is used to
automatically activate an ELT. May also be referred to as a “crash
sensor”.
LED Light Emitting Diode – Semiconductor device that emits light when
current is passed through it. Usually used as a status or warning indicator.
MIL The three-letter acronym that stands for “Military” and proceeds mili-
tary specifications and standards numbers (e.g., MIL-W-xxxx would
indicate a wire specification and MIL-STD-xxxx would indicate a standard).
P/N Part Number – Refers to an ACR Electronics part number, unless oth-
erwise noted. Part numbers are also indicated with parentheses (e.g.,
xxx-xxxx)
PLUG The term “Plug”, within the context of this document, refers to the
male half of an electrical connector.
RECEPTACLE The term “Receptacle”, within the context of this document, refers to
the female half of an electrical connector.
RF Radio Frequency – The range of electromagnetic radiation that con-
stitutes the radio spectrum and corresponds to the frequency of alternating current electrical signals used to produce and detect radio
waves.
RTCA Radio Technical Commission for Aeronautics – Organization that
makes recommendations for airworthiness. Refer to http://
www.rtca.org/aboutrtca.asp for more information.
RTV A rubbery silicon-based adhesive typically used to prevent vibration
problems and water intrusion.
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SAR Search and Rescue
SCREEN ROOM The term “Screen Room”, within the context of this document, refers
to a room designed to suppress RF signals, such that the broadcast of
an ELT placed in the screen room cannot reach the SAR satellite system.
SERVICE LOOP A length of wire or cable, at the connection point, of sufficient length
to allow a component to be withdrawn from its mounting position and
disconnected from its associated wiring.
TETHER A tether is a cord or similar device that anchors something movable
to a stationary point or anchors two items together, such that they
cannot become separated beyond the length of the tether.
TNC CONNECTOR A threaded version of a BNC connector.
TPS CONNECTOR A small, rugged, three-pin bayonet locking connector designed for
use when space and weight limitations are of primary concern.
TSO Technical Standard Order – A TSO is a minimum performance stan-
dard issued by the FAA for specified materials, parts, processes, and
appliances used on civil aircraft.
UTC Coordinated Universal Time – A time standard based on International
Atomic Time. UTC is the time system used in aviation and is often
associated with Greenwich Mean Time (GMT) and/or “Zulu” time.
VHF Very High Frequency – The 30 MHz to 300 MHz radio frequency band.
VSWR Voltage Standing Wave Ratio – Electrical signals will “echo” back on a
wire if load impedance is not matched to the impedance of the wire.
VSWR is a measurement of the amount of voltage being “echoed,”
compared to the original signal.
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6. References
SUBTASK 25-62-03-990-001
A. Regulatory Documents
(1) The following regulatory documents are referred to herein. When referring to such
documents, it is the manual user’s responsibility to ensure they are using the latest revision or
release of such documents. To that end, the revision designator of specific document numbers
has not been included, with the exception of the RTCA document listing, which reflects the
revision level of the documents at the time of TSO testing and certification.
(2) Except in the case of a printed manual, reference documents available on-line or source
locations are linked to applicable web sites.
(3) United States
(a) AC 43-9, “Maintenance Records”
B406-4 (453-5004)
(b) AC 43-210, “Standardized Procedures for Requesting Field Approval of Data, Major
Alterations, and Repairs”
(c) AC 43.9-1, “Instructions for Completion of FAA Form 337”
(d) AC 43-13-1, “Acceptable Methods, Techniques, and Practices – Aircraft Inspection and
Repair”
(e) AC 43.13-2, “Acceptable Methods, Techniques, and Practices - Aircraft Alterations”
(f) FAR, Part 43, “Maintenance, Preventive Maintenance, Rebuilding, and Alteration”
(g) FAR, Part 91, “General Operating and Flight Rules”
(4) Canada
(a) CAR, Part V, “Airworthiness”
(b) CAR, Part VI, “General Operating and Flight Rules”
(5) COSPAS-SARSAT
(a) C/S G.005, “Cospas-Sarsat Guidelines on 406 MHz Beacon Coding, Registration and
Type Approval”
(b) C/S S.007, “Handbook of Beacon Regulations”
(6) RTCA – The following documents are available for purchase at RTCA’s web site www.rtca.org,
or by mail:
(a) DO-160D, “Environmental Conditions and Test Procedures for Airborne Equipment”
(b) DO-178B, “Software Considerations in Airborne Systems and Equipment Certification”
(c) DO-182, “Emergency Locator Transmitter (ELT) Equipment Installation and
Performance”
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DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
(d) DO-183, “Minimal Operational Performance Standards for Emergency Locator
Transmitters - Automatic Fixed-ELT (AF), Automatic Portable-ELT (AP), Automatic
Deployable-ELT (AD), Survival-ELT (S) Operating on 121.5 and 243.0 MHz”
(e) DO-204, “Minimal Operational Performance Standards for 406 MHz Emergency Locator
Transmitters (ELT)”
SUBTASK 25-62-03-990-002
B. Other Documents
(1) The following documents are available on-line at the Artex products web site at
www.acrartexcom, or from ACR Electronics upon request.
(a) 570-1000, “ELT Test Set (ETS) Operation Manual”
(b) 570-6501, “ELT/NAV Interface -B Description, Operation, Installation and Maintenance
Manual”
B406-4 (453-5004)
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DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
B406-4 (453-5004)
THIS IS A BLANK PAGE
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DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
TASK 25-62-03-870-801
1. Description
SUBTASK 25-62-03-870-001
A. Functional Overview
(1) The ELT automatically activates during a crash and transmits the standard sweep tone on
121.5 and 243.0 MHz. Approximately every 50 seconds, for up to 520 milliseconds (long
message protocol), the 406 MHz transmitter turns on. During that time, an encoded digital
message is sent to the COSPAS-SARSAT Search and Rescue (SAR) satellite system.
(2) The information contained in the message includes:
(a) Serial number assigned to the ELT by the beacon manufacturer or the national beacon
registration authority, or
B406-4 (453-5004)
DESCRIPTION AND OPERATION
(b) Aircraft identification or registration number, and
(c) Country of registration and country code; plus
(d) Position coordinates, when coupled with an ELT/NAV Interface -B (453-6501). Refer to
the ELT/NAV Interface -B Description, Operation, Installation and Maintenance Manual
(570-6501) for a detailed discussion of the interaction between the ELT, ELT/NAV
Interface -B, and aircraft navigation system.
(3) The 406 MHz transmitter will operate for 24 hours and then shuts down automatically. The
121.5/243.0 transmitter will continue to operate until the batteries are exhausted, which is at
least 50 hours.
(4) The 406 MHz transmitter produces a much more accurate position, typically 3 kilometers as
compared with 15 to 20 kilometers for 121.5/243.0 MHz transmitters. When coupled to the
aircraft navigation system via the ELT/NAV Interface -B, the accuracy improves to
approximately 100 meters.
(5) The ELT transmits a digital message that allows search and rescue authorities to contact the
owner/operator of the aircraft through information contained in a database. Information
contained in the database includes:
(a) Type of aircraft and aircraft registration number,
(b) Owner address and telephone number, and
(c) Alternate emergency contact.
(6) After the ELT is activated and the 406 MHz signal is detected by the SAR satellite system and
a position is calculated, the 121.5/243.0 MHz transmissions are used to home in on the crash
site.
NOTE
: Effective February 1, 2009, COSPAS-SARSAT has terminated satellite processing of
distress signals from 121.5 and 243.0 MHz beacons.
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PROTECTIVE TOP
COVER ASSY
MOUNTING FRAME
CAP ASSY
ELT MAIN
ASSEMBLY
MOUNTING
TRAY ASSY
REMOTE
SWITCH
CONNECTOR
CONTROL
SWITCH
ANTENNA BNC
CONNECTOR
A
A
ANTENNA TPS
CONNECTOR
DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
(7) Aircraft communications transceivers are not capable of receiving 406 MHz transmissions;
therefore, the only methods of monitoring the ELT are:
(a) The cockpit remote switch panel light,
(b) The buzzer, or
(c) 121.5/243.0 MHz transmissions, which can be monitored using the aircraft
communications transceiver or an AM radio tuned to 121.5 MHz.
SUBTASK 25-62-03-870-002
B. Components
(1) The B406-4 ELT main assembly is housed in a high impact, fire resistant, polycarbonate plastic
case, which is enclosed in a protective mounting frame assembly made of similar material. See
Figure 1. B406-4 ELT and Mounting Frame Assembly.
NOTE
: The ELT main assembly and its mounting frame assembly are capable of
withstanding extremely harsh environments and have been subjected to the rigorous
environmental testing required by COSPAS-SARSAT for certification.
B406-4 (453-5004)
Figure 1. B406-4 ELT and Mounting Frame Assembly
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ON
ELT
ELT
ARM
DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
B406-4 (453-5004)
(2) The cockpit-mounted Control Panel G737 (remote switch panel assembly) is a backlit panel
comprised of an ELT status indicator light and a control switch, which allows an operator to
manually activate the ELT for testing and reset (i.e., deactivate) the ELT. See Figure 2.
Remote Switch Panel Assembly Front View.
NOTE
: The ELT CANNOT be disarmed or disabled from the cockpit. Cockpit operation is
limited to deactivating the ELT (i.e., reset) or manually activating the ELT.
Figure 2. Remote Switch Panel Assembly Front View
(3) The buzzer (i.e., horn) provides an audible alert when the ELT is active. See Figure 3.
Buzzer.
Figure 3. Buzzer
(4) The battery pack for the B406-4 ELT consists of four “D” size lithium manganese dioxide cells
connected in series. In an effort to increase the safety of the battery pack, a number of
features were designed into the battery pack. To prevent the cells from being charged, diodes
are connected across each cell and fuses are connected to the output. See Figure 4. Battery
Pack Assembly.
Figure 4. Battery Pack Assembly
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110-320
110-328-01
110-333
110-337 110-337-11
DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
B406-4 (453-5004)
(5) Five dual-input antennas are approved for use with the B406-4 ELT. Selection of the proper
antenna is dependent upon end use, aircraft configuration, speed, and other factors. See
Figure 5. Antennas.
Figure 5. Antennas
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ELT
“INACTIVE”
ELT “ACTIVE”
BUZZER “ON”
LED “ON”
ELT
SWITCH
“ON”
REMOTE
SWITCH
“ON”
G-SWITCH
“ON”
ELT OR
REMOTE SW
“RESET”
YES
YES
NO
NO
NO
YES
NO
YES
DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
TASK 25-62-03-870-803
2. Operation
SUBTASK 25-62-03-870-001
A. Operational Overview
(1) See Figure 6. ELT Operational Flow Diagram.
(2) A primary feature of the B406-4 ELT is its simplicity of operation. As long as the ELT is
connected to the remote switch panel harness ELT connector, such that pins 5 and 8 are
jumpered (G-switch loop), it will activate in the event of a crash.
NOTE
: Neither the cockpit remote panel switch or the ELT local switch can be positioned in
such a manner as to prevent automatic activation when the ELT is connected
properly.
B406-4 (453-5004)
Figure 6. ELT Operational Flow Diagram
(3) ELT operation is designed to prevent human error and misuse in regards to automatic
activation. The ELT cannot be activated by dropping, rough handling or during shipping.
(4) When the ELT is activated, the presence of the emergency sweep tone and the illuminated
cockpit remote switch panel light indicates an active ELT. The cockpit ELT remote panel light
must immediately illuminate upon ELT activation and stay on steady.
NOTE
: The local LED on the ELT flashes every 3-4 seconds when the ELT is activated.
(5) The ELT is considered to be either “ACTIVE” or “INACTIVE”. When “INACTIVE”, the ELT is in a
state of rest and performs no functions. Taking the ELT from the “INACTIVE” state to the
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DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
“ACTIVE” state requires a positive switch transition from either the cockpit remote switch, ELT
local switch, or G-switch.
NOTE
: It is possible the G-switch could activate the ELT as the result of severe maneuvers
or a very hard landing.
(6) To take the ELT from an “ACTIVE” state back to an “INACTIVE” state, a “RESET” must occur.
See SUBTASK 25-62-03-870-004.
(7) A warning buzzer is required under C126 TSO approval. The buzzer is powered by the aircraft
battery.
SUBTASK 25-62-03-870-002
B. Normal Operation
(1) The cockpit remote switch is in the “ARM” position (i.e., down).
(2) The local switch on the ELT is in the “OFF” position (i.e., down).
SUBTASK 25-62-03-870-003
B406-4 (453-5004)
C. Manual Activation
(1) The ELT may be manually activated by placing either switch in the “ON” position.
NOTE
: As long as the cockpit remote switch and the ELT local switch are in the ARM/OFF
positions respectively, the ELT will automatically activate on impact.
SUBTASK 25-62-03-870-004
D. ELT Reset
(1) If the ELT is activated accidently, it will need to be reset.
(2) Reset the ELT from the cockpit by moving the remote switch to the “ON” position, waiting
approximately one second, and then moving it back to the “ARM” position. If the switch is
already in the “ON” position, move it to the “ARM” position.
(3) Reset the ELT locally by moving the switch on the ELT to the “ON” position, waiting
approximately one second, and then moving it back to the “OFF” position. If the switch is
already in the “ON” position, move it to the “OFF” position.
NOTE
: The ELT cannot be reset if either the cockpit remote switch or the ELT local switch is
in the “ON” position.
SUBTASK 25-62-03-750-001
E. Functional Check
(1) A monthly functional check is recommended to verify operational status of the ELT.
(2) Perform this functional check in accordance with SUBTASK 25-62-03-750-011 on page 45.
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DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
TASK 25-62-03-870-803
3. Specifications
SUBTASK 25-62-03-870-001
A. Environmental and Physical
(1) Table 2 lists the environmental and physical specifications of the B406-4 ELT.
NOTE
: For automatic activation, the higher threshold of 4.5 ft/sec (2.3 g) is specified in
accordance with Eurocae ED-62. Use of the higher threshold crash sensor has been
approved by the FAA as a deviation to TSO C126 (FAA Reference #98-130S-108,
February 6, 1998).
Table 2 Environmental and Physical Specifications
CRITERIA PARAMETER CHARACTERISTIC
B406-4 (453-5004)
Storage -55° C to +85° C
Temperature
Operating -20° C to +70° C
10
g
Vibration
Shock 500
Crashworthiness 100
Mechanical
Automatic Activation G-Switch 4.5 ±0.5 ft/sec (2.3
Weight
Dimensions (LxHxW)
Software In accordance with RTCA/DO-178B, Level D
ELT Complete w/Battery Pack,
Mounting Tray, and Covers
ELT Complete w/Battery Pack,
Mounting Tray, and Covers
Humidity 95% for 240 hours
Penetration 55 lbs from 6 in. (25 kg from 15 cm)
Crush 1,000 lbs (454 kg)
Altitude 55,000 ft (16,764 m)
11.63 x 3.90 x 3.76 in.
(295 x 99 x 96 mm)
Sinusoidal
6.1 GRMS Random
g
for 4 ms
g
for 23 ms
4.25 lbs (1.9 kg)
g
)
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DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
SUBTASK 25-62-03-870-002
B. Electrical
(1) Table 3 lists the electrical specifications of the B406-4 ELT.
CRITERIA PARAMETER CHARACTERISTIC
Operating Frequencies
Modulation
B406-4 (453-5004)
Table 3 Electrical Specifications
± 2 KHz (Initial)
406.025 MHz
406.028 MHz, or higher ± 1 KHz
121.5 and 243.0 MHz ± 0.005%
406 MHz Bi-Phase L (G1D)
121.5 and 243.0 MHz Amplitude Modulation (A3X)
± 5 KHz (5 years)
2 parts/10E9 in 100 ms
Transmitter Duty Cycle
Peak Effective Radiated
Power (PERP)
Occupied Bandwidth
Spurious Emissions
Battery
440 ms (± 1%), or
406 MHz
121.5 and 243.0 MHz Continuous
406 MHz
Min. 50 mW (17 dBm) PERP for 50 hrs
121.5 and 243.0 MHz
(20 dBm) for 48 hrs @ -20° to +55° C
406 MHz 20 KHz max.
121.5 and 243.0 MHz 25 KHz max.
406 MHz Per RTCA/DO-204
121.5 and 243.0 MHz Per CFR Title 47 (FCC), Part 87
Type of Cell Lithium Manganese Dioxide
Voltage 12.0
Amp-Hour Rating 10.0
520 ms (± 1%), every
50 seconds (± 5%)
5 W (37 ± 2 dB) PERP or
EIRP for 24 hrs @ -20° to +55° C
@ -20° to +55° C or 100 mW EIRP
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DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
B406-4 (453-5004)
SUBTASK 25-62-03-870-003
C. Antennas
(1) Table 4 lists the specifications of the antennas approved for use with the B406-4 ELT.
Table 4 Antenna Specifications
CHARACTERISTIC
PARAMETERS
110-320 110-328-01 110-333 110-337 110-337-11
Style Rod Blade Blade Blade Blade
Frequencies 121.5, 243.0, 406 MHz
121.5 and 243.0
VSWR
MHz - 2.0:1 Max.
406 MHz - 1.5:1
Max.
121.5/243.0 MHz - 2.0:1 or better
406 MHz - 1.5:1 or better
121.5/243.0 MHz - 2.0:1 Max.
406 MHz - 1.5:1 Max.
Polarization Vertical Monopole
Radiation
Pattern
Impedance
(ohms)
Weight
Coax Cable RG-142
Connectors BNC Female (121.5/243.0 MHz) and TNC Female (406 MHz)
Dimensions
(Base-to-Tip)
0.45 lbs
(0.20 kg)
15.50 in.
(39.4 cm)
121.5/243 MHz - Omnidirectional
406 MHz - Hemispherical
50 Nominal
1.20 lbs
(0.54 kg)
9.00 in.
(22.9 cm)
0.76 lbs
(0.34 kg)
10.10 in.
(25.7 cm)
1.30 lbs
(0.59 kg)
7.75 in.
(19.7 cm)
1.60 lbs
(0.73 kg)
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DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
B406-4 (453-5004)
TEST AND FAULT ISOLATION
TASK 25-62-03-750-801
1. Inspection and Test Regulatory Requirements
SUBTASK 25-62-03-990-001
A. United States
(1) In accordance with FAR Part 91, Subpart C, § 91.207 (d), the ELT must be inspected within 12
calendar months after the last inspection for:
(a) Proper installation;
(b) Battery corrosion;
(c) Operation of controls and crash sensor; and
(d) The presence of a sufficient signal radiated from its antenna.
(2) All maintenance shall be performed in accordance with FAR Part 43, Appendix D, which
requires the following inspections at each annual or 100-hour inspection:
(a) ELT and mount for improper installation;
(b) Wiring and conduits for improper routing, insecure mounting, and obvious defects;
(c) Bonding and shielding for improper installation and poor condition; and
(d) Antenna, including trailing antenna, for poor condition, insecure mounting, and improper
operation.
SUBTASK 25-62-03-990-002
B. Canada
(1) CAR Part VI, Standard 625, Appendix C, requires the ELT to be inspected at intervals not
exceeding 12 months.
(2) All maintenance and testing shall be performed in accordance with the requirements of CAR
Part V, Standard 571, Appendix G, which requires:
(a) Corrosion inspection;
(b) Operational testing;
(c) Performance testing, including:
1
Measured peak power after 3 minutes of operation,
2
Measured frequency after 3 minutes of operation,
3
Audio modulation, which shall be recognizable as a typical ELT signal,
4
Measured current draw in the “OFF” (ARM) and in the “ON” position, as specified
by the manufacturer, and
5
The automatic activation system.
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DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
SUBTASK 25-62-03-990-003
C. Other Countries
(1) For all other countries, maintenance and testing shall be conducted in accordance with the
requirements of applicable national regulatory authorities and the requirements herein, as
applicable. Local regulations and requirements shall take precedence.
B406-4 (453-5004)
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DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
B406-4 (453-5004)
TASK 25-62-03-750-802
2. Inspection and Test Procedures
SUBTASK 25-62-03-990-001
A. Checklist
(1) Table 5 provides a list of the ELT inspection and testing requirements, a copy of which may be
used as a checklist to verify inspection and test completion. The item numbers in the table
correspond to the item identifiers for each task.
NOTE
: Items 5a through 5h are mandatory requirements only in Canada, in addition to
meeting the other inspection and test requirements listed in Table 5.
Table 5 ELT Inspection and Test Checklist
ITEM NO. DESCRIPTION BY
1 Coax Cable and Wiring Connections Inspection
2 ELT Mounting Tray and Hardware Inspection
3 ELT Battery Pack Inspection
4 G-Switch Functional Check
5a 121.5 MHz Frequency Measurement
5b Audio Modulation Check
5c 121.5/243.0 MHz Power Output Measurement
5d 406 MHz Frequency Measurement
5e 406 MHz Power Output Measurement
5f Current Draw Test
5g Digital Message Verification
5h ELT Reset Check
6 Installed Transmitter Test
7 Antenna Test
8 Inspection and Test Documentation
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DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
B406-4 (453-5004)
SUBTASK 25-62-03-000-001
B. Preparation
(1) Remove the ELT in accordance with SUBTASK 25-62-03-010-001 on page 51.
(2) Remove the battery pack in accordance with SUBTASK 25-62-03-050-001 on page 52.
SUBTASK 25-62-03-220-001
C. Coax Cables and Wiring Connections Inspection – Item 1
(1) Check remote panel harness connector for corrosion bent or broken pins and other damage.
(2) Check antenna coax cable connectors for corrosion, bent or broken center conductor, and
other damage.
NOTE
: Pay special attention to the center conductor, which is prone to retracting into the
connector housing.
SUBTASK 25-62-03-220-002
D. Mounting Tray and Hardware Inspection – Item 2
(1) Inspect mounting tray for cleanliness, cracks, and other damage.
(2) Check mounting tray hardware installation for security.
SUBTASK 25-62-03-220-003
E. Battery Pack Inspection – Item 3
CAUTION
CAUTION
(1) Check battery cells, components, and connectors for corrosion and other damage.
(2) Check wiring for breaks, damaged insulation, and improper or damaged connections.
(3) Check housing for cracks and other visual damage.
: THE BATTERY PACK CONTAINS ELECTROSTATIC DISCHARGE SENSITIVE (ESD)
COMPONENTS AND, AS SUCH, IT MUST BE HANDLED WITH CARE. IF POSSIBLE, WEAR
A GROUNDED WRIST STRAP WHEN HANDLING THE BATTERY PACK DURING
INSPECTION AND MAINTENANCE ACTIVITIES. TAKE PARTICULAR CARE TO AVOID
TOUCHING THE EXPOSED CIRCUIT BOARD AND CONNECTOR PINS ON THE BOARD.
: DO NOT USE CONTACT CLEANER ON ELT COMPONENTS. SUCH CHEMICAL AGENTS
CAN BE HIGHLY DESTRUCTIVE TO THE MOUNTING HARDWARE AND ELT HOUSING,
CAUSING CRACKING, FRACTURING AND OTHER DAMAGE.
(4) Remove any corrosion residue from the underside of the ELT.
(5) Check the battery pack expiration date.
(6) Replace the battery pack if any of the following conditions are true:
(a) After use in an emergency;
(b) After an inadvertent activation of unknown duration;
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DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
(c) When the total of all known transmissions exceeds one hour; or
(d) On or before battery replacement (expiration) date.
SUBTASK 25-62-03-750-001
F. G-Switch Functional Check – Item 4
B406-4 (453-5004)
CAUTION
(1) Reinstall the battery temporarily. See SUBTASK 25-62-03-450-001 on page 74.
(2) Perform this functional check within the first 5 minutes after the hour (UTC), as required by
(3) Notify any nearby control tower of your intentions.
(4) Install the 151-2012 test plug (receptacle) on the ELT plug or jumper ELT plug Pins 5 and 8.
(5) Verify the ELT switch is in the “OFF” position.
(6) Monitor 121.5 MHz on an AM receiver.
(7) Activate the ELT by using a rapid forward (i.e., throwing) motion in the direction of the arrow
: A JUMPER IS REQUIRED TO PERFORM THIS CHECK. DUE TO THE POTENTIAL OF
PHYSICAL DAMAGE IF THE JUMPER IS IMPROPERLY INSTALLED, THIS STEP SHOULD
ONLY BE PERFORMED BY AN EXPERIENCED TECHNICIAN/MECHANIC.
NOTE
: For the purposes of this and subsequent tests, it is suggested that the battery be
installed with only two screws, located diagonally from each other.
AC 43.13-1, Chapter 12, § 12-22, Note 3.
NOTE
: The ELT cannot be activated using this procedure unless Pins 5 and 8 on the ELT
plug are jumpered. See Figure 19. Remote Switch Panel Harness Wiring Diagram on
page 66.
on the ELT label, followed by a rapid reversing action.
(8) Verify activation by listening for the aural sweep tone on the receiver.
(9) Reset the ELT by toggling the control switch to the “ON” position and then back to the “OFF”
position.
SUBTASK 25-62-03-750-002
G. Performance Testing Setup
NOTE
: The ELT software routine logs battery life in 30-second increments. A minimum of 30
seconds is added to the battery usage total each time the ELT is activated and de-activated.
If the ELT is left activated beyond the first 30 seconds, additional time is added in 30second increments.
NOTE
: Careful planning of the performance tests is necessary to avoid activating the ELT more
than necessary. Plan the performance testing in a manner that allows tests to be run
concurrently and test equipment settings to be quickly switched from one test to another.
By doing so, the three-minute warm-up requirement can be eliminated from a number of
tests and battery run time minimized to a large extent.
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ELT ANTENNA
BNC CONNECTOR
(121.5/243.0 MHz)
TPS CONNECTOR
(406 MHz)
30 dB
ATTENUATOR
(if required)
MEASURING
DEVICE
DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
B406-4 (453-5004)
(1) Place the ELT in a container or screen room capable of substantially attenuating RF signals, or
the transmitter power output shall be connected to a suitable dummy load to minimize
radiation.
(2) Use the ELT’s own battery pack as the power source for these measurements. An alternate
power source can be used where lengthy servicing, other than the performance tests, is
anticipated.
(3) Ensure that adequate attenuation rated for 406 MHz is installed between the ELT antenna
output and the measurement equipment to prevent damaging input circuitry, if required. At a
minimum, the attenuator should be rated at 30 dB, and 5 watts for a ½-second duration. As
shown in Figure 7. Performance Testing Equipment Setup.
Figure 7. Performance Testing Equipment Setup
SUBTASK 25-62-03-750-003
H. 121.5 MHz Frequency Measurement – Item 5a
(1) Connect the measuring device, referring to SUBTASK 25-62-03-750-002 on page 40.
(2) Activate the ELT by placing the control switch in the “ON” position.
(3) Wait three minutes.
(4) Perform SUBTASK 25-62-03-750-004 during the three-minute waiting period.
(5) Measure the frequency after the three-minute waiting period. The frequency should be within
tolerance specified in Table 3 on page 34.
NOTE
: If the 121.5 MHz carrier frequency is within specified tolerance, the 243.0 MHz
frequency will also be within tolerance.
SUBTASK 25-62-03-750-004
I. Audio Modulation Check – Item 5b
(1) Perform this check in conjunction with SUBTASK 25-62-03-750-003.
(2) Monitor 121.5 MHz on an AM receiver.
(3) Listen for the aural sweep tone on the receiver. The audio should “sound” like an ELT.
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DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
B406-4 (453-5004)
SUBTASK 25-62-03-750-005
J. 121.5/243.0 MHz Power Output Measurement – Item 5c
(1) Connect the measuring device, referring to SUBTASK 25-62-03-750-002 on page 40.
(2) Activate the ELT, if necessary, by placing the control switch in the “ON” position.
(3) Wait three minutes.
(4) Read the displayed amplitude for 121.5 MHz. The amplitude must be within the minimum
specified for 121.5 MHz in Table 3 on page 34, at the terminal output.
(5) Change to 243.0 MHz and repeat the procedure for 243.0 MHz.
SUBTASK 25-62-03-750-006
K. 406 MHz Frequency Measurement – Item 5d
CAUTION
(1) Connect the measuring device, referring to SUBTASK 25-62-03-750-002 on page 40.
(2) Activate the ELT, if necessary, by placing the control switch in the “ON” position.
(3) Wait three minutes.
(4) Measure the frequency. Measure the frequency after the three-minute waiting period. The
SUBTASK 25-62-03-750-007
L. 406 MHz Power Output Measurement – Item 5e
CAUTION
(1) Connect the measuring device, referring to SUBTASK 25-62-03-750-002 on page 40.
(2) Activate the ELT, if necessary, by placing the control switch in the “ON” position.
: POWER OUTPUT IS APPROXIMATELY 37 DB (5 WATTS). BE SURE ADEQUATE
ATTENUATION IS INSERTED IN-LINE BETWEEN THE ELT ANTENNA OUTPUT AND THE
MEASURING DEVICE TO PROTECT THE INPUT CIRCUITS OF THE MEASURING DEVICE.
frequency must be within the tolerance specified in Table 3 on page 34.
NOTE
: The exact 406 MHz frequency used is printed on the ELT product label.
: POWER OUTPUT IS APPROXIMATELY 37 DB (5 WATTS). BE SURE ADEQUATE
ATTENUATION IS INSERTED IN-LINE BETWEEN THE ELT ANTENNA OUTPUT AND THE
MEASURING DEVICE TO PROTECT THE INPUT CIRCUITS OF THE MEASURING DEVICE.
(3) Wait three minutes.
(4) Read the displayed amplitude of the 406 MHz burst that follows the three-minute wait period.
The amplitude must be within the minium specified for 406 MHz in Table 3 on page 34, at the
output terminal.
(5) Deactivate the ELT by placing the control switch in the “OFF” position.
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+
A
—
CIRCUIT BOARD IN
BATTERY PACK
TO ELT
611-0024
TEST HARNESS
DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
SUBTASK 25-62-03-750-008
M. Current Draw Test – Item 5f
B406-4 (453-5004)
CAUTION
CAUTION
(1) Verify the ELT control switch is in the “OFF” position.
(2) Separate the battery pack from the ELT.
(3) Disconnect the 2-wire ELT power connector.
(4) Install test harness 611-0024, or equivalent, in the power circuit. See Figure 7. Performance
: EXERCISE EXTREME CAUTION TO AVOID CAUSING A SHORT CIRCUIT CONDITION,
WHICH WILL BLOW THE FUSES IN THE BATTERY PACK. THIS TEST SHOULD ONLY BE
PERFORMED BY AN EXPERIENCED TECHNICIAN/MECHANIC.
: ALL “ON” STATE CURRENT MEASUREMENTS MUST BE MADE WITH THE RF OUTPUT
(I.E., ELT ANTENNA CONNECTOR) LOADED WITH 50 OHMS RATED FOR 5 WATTS.
EITHER A RESISTIVE LOAD OR EQUIPMENT WITH 50 OHM IMPEDANCE PADDED WITH
10 DB/5 WATT ATTENUATOR. REFER TO SUBTASK 25-62-03-750-002 ON PAGE 40.
Testing Equipment Setup.
Figure 8. Current Draw Test Setup
(5) Read the current draw on the ammeter. Measured current should be 0 µA (micro-amps), and
must not be more than 6 µA.
(6) Verify the ammeter is set to accommodate a range of at least 3.5 amps.
(7) Activate the ELT by placing the control switch in the “ON” position.
Page 43 of 87
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ACR ELECTRONICS, INC / ARTEX PRODUCTS
Sarsat Beacon Reader
Beacon ID = ADDF8E345CD35D0
Message Type = Test, Short
Country = 366 USA
Aviation ELT S/N = 6521
Type Approval # = 112
Aux Locating Devices = No
121.5 MHz Beacon = Yes
Nov 13, 2009 11:39 am 55 sec
ClearDonePrint
DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
(8) Allow the ELT to stabilize for at least 30 seconds to avoid false readings.
(9) Read the current draw on the ammeter. Steady state current draw must not exceed 200 mA.
(10) Deactivate the ELT by placing the control switch in the “OFF” position.
(11) Remove the test harness.
(12) Reinstall the battery pack in accordance with SUBTASK 25-62-03-450-001 on page 74.
SUBTASK 25-62-03-750-009
N. Digital Message Verification – Item 5g
(1) Set the 453-1000 ELT Test Set (ETS) beacon reader to receive and decode the ELT digital
message. Refer to the ETS operating manual (570-1000) for ETS operating instructions and
additional details.
NOTE
: A beacon reader equivalent to the ETS may be used, provided it is capable of
receiving and decoding the 406 MHz digital message.
B406-4 (453-5004)
(2) Activate the ELT by placing the control switch in the “ON” position.
(3) Allow the ELT to transmit for approximately 5 seconds.
(4) Deactivate the ELT and read the test message broadcast at “turn-off”. Message examples are
shown in Figure 9. Short and Long 406 MHz Message Examples.
(a) The test message broadcast by the ELT at “turn-off” contains all the information in an
actual distress message, except there is a special digital prefix that informs COSPASSARSAT satellites to ignore the message.
(b) The left hand example in Figure 9. Short and Long 406 MHz Message Examples, is an
ELT programmed for “User Protocol ELT with Serial Number”, with a test Hex ID. The
right hand example is an ELT programmed for “Standard Location Protocol ELT with
Serial Number”.
(c) Actual messages will vary depending on the protocol and information programmed into
the ELT.
(d) If the ELT is programmed with a location (long message) protocol and disconnected
from the ELT/NAV Interface -B, the message will indicate “Position Invalid” in lieu of
position data, as shown in the right hand example in Figure 9. Short and Long 406 MHz
Message Examples.
Figure 9. Short and Long 406 MHz Message Examples
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DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
(5) Repeat the activation and deactivation cycle if the ETS fails to read the message on the initial
try. The 406 MHz oscillator may not be warmed up. If continued attempts to read the
message fail, check for self-test error codes and refer to Table 6 on page 48.
SUBTASK 25-62-03-750-010
O. ELT Reset Check – Item 5h
(1) Place the ELT control switch in the “ON” position.
(2) Return the switch to the “OFF” position.
(3) If the ELT is working properly, the LED will stay on for approximately 1 second and then turn
off. If a series of flashes are displayed, refer to Table 6 on page 48.
NOTE
: A 5-flash error indication will occur if the ELT is programmed with a location protocol,
since no navigation input data is present.
SUBTASK 25-62-03-750-011
P. Installed Transmitter Test – Item 6
B406-4 (453-5004)
CAUTION
(1) Reinstall the ELT battery pack. See SUBTASK 25-62-03-450-001 on page 74.
(2) Reinstall the ELT. See SUBTASK 25-62-03-410-001 on page 71.
(3) Perform the following functional check within the first 5 minutes after the hour (UTC), as
(4) Notify any nearby control tower of your intentions.
(5) Tune a receiver, usually the aircraft transceiver, to 121.5 MHz.
(6) Monitor the LED on the ELT during this test.
(7) Activate the ELT by placing the cockpit remote switch in the “ON” position. The panel light will
(8) Listen for 3 audible sweeps on the receiver, which takes about 1 second.
(9) Verify the buzzer sounds immediately upon activation.
: DO NOT ALLOW THE DURATION OF THIS TEST TO EXCEED 5 SECONDS. THE ELT
WILL TRANSMIT A 406 MHZ SIGNAL AFTER THE ELT IS ACTIVATED FOR
APPROXIMATELY 47 SECONDS. THE COSPAS-SARSAT SATELLITE SYSTEM WILL
CONSIDER THE 406 MHZ TRANSMISSION TO BE A VALID DISTRESS SIGNAL.
required by AC 43.13-1, Chapter 12, § 12-22, Note 3.
NOTE
: An AM radio may be used to receive the signal.
illuminate and stay on steady.
NOTE
: The LED on the ELT will begin flashing continuously when the ELT is activated.
(10) Return the remote switch to the “OFF” position while monitoring the ELT LED activity when
the ELT enters the “OFF” condition. If the ELT is working properly, the LED will stay on for
approximately 1 second and then turn off.
NOTE
: This test also completes the requirement to check ELT controls by verifying operation
of the remote switch.
(11) Refer to Table 6 on page 48 if the ELT LED displays a series of flashes.
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DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
SUBTASK 25-62-03-750-012
Q. Antenna Test – Item 7
B406-4 (453-5004)
CAUTION
(1) Tune a low quality AM receiver (i.e., radio) to 121.5 MHz.
(2) Place the radio approximately six inches from the antenna.
(3) Activate the ELT by placing the cockpit remote switch in the “ON” position.
(4) Listen for 3 audible sweeps on the radio, which takes about 1 second. An audible signal
(5) Reset the ELT by placing the cockpit remote switch in the “ARM” position.
SUBTASK 25-62-03-750-013
R. Inspection and Test Documentation – Item 8
(1) Make an appropriate entry in the aircraft maintenance records (i.e., logbook), including the
: DO NOT ALLOW THE DURATION OF THIS TEST TO EXCEED 5 SECONDS.
NOTE
: The aircraft transceiver is not recommended for this test, because it is too sensitive
to verify the integrity of the antenna system and it may pick up a weak signal even if
the antenna is disconnected from the ELT. An AM radio provides a better level of
confidence for this test.
NOTE
: Perform this test within the first five minutes after the hour UTC.
verifies energy is being transmitted by the antenna.
date the ELT inspection and testing was satisfactorily completed.
(2) In addition to the requirements of Step (1), for aircraft operating under Canadian authority
and following satisfactory completion of performance testing, the date on which the test was
performed shall be marked on the ELT external casing in a legible and permanent manner.
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DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
B406-4 (453-5004)
TASK 25-62-03-810-801
3. Troubleshooting
SUBTASK 25-62-03-810-001
A. Self-Test Error Troubleshooting Guidelines
(1) Table 6 describes the ELT self-test LED error codes (i.e., flash codes), their probable causes,
and possible solutions. The 5-flash error is not present when the ELT is programmed with a
serial user protocol (short message).
NOTE
: Upon activation, the LED will display a long single flash, which is normal. Any self-
test error codes will display following this initial flash. Do not confuse the initial flash
with a 1-flash error code. If there are multiple errors, there is a 0.5 to 1.0 second
pause between each error code.
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DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
B406-4 (453-5004)
Table 6 ELT Self-Test Error Codes Troubleshooting Guide
CODE PROBABLE CAUSE POSSIBLE SOLUTION
Indicates a G-switch loop open (Pins 5 and 8)
1-Flash
3-Flash
Remote switch harness connector loose or
disconnected at ELT
ELT connector pins bent or broken
Connector pins 5 and 8 jumper open
(internal to remote switch harness
connector at ELT end)
Indicates a 406 MHz transmission problem
Open or short condition on antenna
output or coax cable
Antenna or installation faulty
Impedance presented by antenna
Check connector and tighten as necessary
Check condition of connector pins and
repair or replace as necessary
Repair open jumper
Verify the coax cable/antenna is
connected and in good condition
Perform continuity check of center
conductor and shield
Check for a shorted cable
Check for intermittent connection in the
coax cable
Check with a VSWR meter. Check antenna
for opens, shorts, or a resistive ground
plane connection
Lengthen or shorten antenna coax cable
length by 4 to 6 inches
3-Flash
(cont.)
Insufficient ground plane
Upright metal structure obstructing
antenna causing re-radiation
Low power output
Improper programming Verify 406 MHz programming
Transmitter module faulty
Provide ground plane at least 12 inches in
diameter
Stay at least 10-12 inches away from
upright metal structures
Battery low
3A fuse on battery pack circuit board
faulty
Cannot be repaired in field - Return to
factory for servicing
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DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
B406-4 (453-5004)
CODE PROBABLE CAUSE POSSIBLE SOLUTION
Indicates there is no navigation position data present
Aircraft navigation system off Turn on navigation system
5-Flash
7-Flash
Faulty system interface wiring or
connections
No 453-6501 ELT/NAV Interface-B
installed
Indicates a battery problem
Operating time is >1 hour
Electrical circuits faulty
Check wiring and connections for
continuity and security
Install 453-6501 ELT/NAV Interface -B
Reprogram to short message
Replace battery pack
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DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
SUBTASK 25-62-03-810-002
B. ELT Troubleshooting Guidelines
(1) Table 7 provides ELT troubleshooting guidelines for installation and operational issues.
SYMPTOM PROBABLE CAUSE POSSIBLE SOLUTION
B406-4 (453-5004)
Table 7 ELT Troubleshooting Guide
Improper wiring Verify wiring
Remote panel status light always
on (steady)
ELT will not turn off
Check for frayed insulation
Short circuit
Battery too low to support 406
burst and causes circuit to reset
Turn off ELT using local switch - If ELT turns off:
Defective remote panel harness
reset circuit wiring
Defective remote switch Replace remote panel
If ELT does not turn off using local switch:
ELT defective
Verify integrity of all crimp and
solder connections
Remove battery pack to disable
ELT and replace battery pack
Check wiring continuity and
repair as necessary
Remove battery pack to disable
ELT and return ELT to factory for
servicing
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PROTECTIVE TOP
COVER ASSY
MOUNTING FRAME
CAP ASSY
ELT MAIN
ASSY
MOUNTING
TRAY ASSY
2
3
7
4
5
DISCONNECT COAX
CABLE
DISCONNECT HARNESS
1
LOOSEN THUMBSCREW
(2 PLCS)
6
DISCONNECT COAX
CABLE
NOTE: Coax cables and
wiring harness not
shown for clarity.
DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
TASK 25-62-03-010-801
1. ELT
SUBTASK 25-62-03-010-001
A. ELT Removal
(1) See Figure 10. ELT Removal Sequence.
B406-4 (453-5004)
REMOVAL
(2) Loosen the mounting frame cap thumbscrews.
(3) Slide the mounting frame cap back away from the ELT.
(4) Lift the protective top cover up, away from the ELT and set it aside.
(5) Disconnect the two antenna coax cables from the ELT.
(6) Disconnect the harness receptacle from the ELT, if necessary.
(7) Lift the ELT up from the connector end.
(8) Slide the ELT up and out, away from the mounting tray.
NOTE
NOTE
Figure 10. ELT Removal Sequence
: The receptacle may disconnect when the mounting frame cap is pulled back.
: Careful use of a flat blade screwdriver as a lever will make this step easier.
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ACR ELECTRONICS, INC / ARTEX PRODUCTS
NOTE: Plug is
recessed in
ELT Assembly
RTV puddle
ELT ASSEMBLY
BATTERY PACK
SCREW (4 PLCS)
DISCONNECT
DISCONNECT
DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
TASK 25-62-03-050-801
2. Battery
SUBTASK 25-62-03-050-001
A. Battery Pack Removal
B406-4 (453-5004)
CAUTION
: THE BATTERY PACK CONTAINS ELECTROSTATIC DISCHARGE SENSITIVE (ESD)
COMPONENTS AND IT MUST BE HANDLED WITH CARE. IF POSSIBLE, WEAR A
GROUNDED WRIST STRAP WHEN HANDLING THE BATTERY PACK DURING
INSTALLATION ACTIVITIES. TAKE PARTICULAR CARE TO AVOID TOUCHING THE
EXPOSED CIRCUIT BOARD AND CONNECTOR PINS ON THE BOARD
CAUTION
: THE BATTERY PACK IS CONNECTED TO THE ELT VIA SHORT INTERCONNECT
HARNESSES, WHICH LIMIT THE DISTANCE THE TWO COMPONENTS CAN BE
SEPARATED UNTIL THE HARNESSES ARE DISCONNECTED.
(1) See Figure 11. Battery Pack Removal.
Figure 11. Battery Pack Removal
(2) Turn the ELT upside down, such that the battery pack is bottom side up.
(3) Remove the four retaining screws.
(4) Lay the ELT on its side, while keeping the ELT and battery pack securely held together.
(5) Separate the battery pack from the ELT, taking care not to put strain on the short interconnect
harnesses.
(6) Disconnect the large harness from the 8-pin header on the small circuit board mounted in the
battery pack.
(7) Disconnect the battery pack 2-wire harness from the connector recessed in the ELT body.
Page 52 of 87
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DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
TASK 25-62-03-500-801
3. Material or Equipment Return
SUBTASK 25-62-03-510-001
A. Shipment Information
(1) If any material or equipment is to be returned to the factory, under warranty or otherwise,
ACR Electronics must be notified prior to shipment with the following information:
• Model and serial number of equipment being returned,
• Date purchased,
• Date placed in service,
• Number of hours in service,
• Nature and cause of failure, and
• Remarks, if any.
B406-4 (453-5004)
SUBTASK 25-62-03-580-001
B. Return Material Authorization
(1) Upon receipt of such notice, ACR Electronics will issue a Return Material Authorization (RMA)
number which then authorizes return of the material or equipment to the following address:
(a) Failure to obtain a RMA number and provide the details listed in SUBTASK 25-62-03-510-
001 may cause unnecessary delay and/or rejection of the returned material or
equipment.
(b) All material or equipment returned to the factory must be freight prepaid.
(c) Acceptable methods of shipment for international return are Airborne, Burlington Air,
DHL, Emery, Federal Express, UPS International, and World Wide only.
Repair and Overhaul
ACR Electronics
5757 Ravenswood Road
Fort Lauderdale, FL 33312 USA
Phone: (954) 981-3333
Fax: (954) 983-5087
NOTE
: Do not use “International Commercial Airlines”, such carriers may cause a loss
of returned material or equipment.
Page 53 of 87
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DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
B406-4 (453-5004)
INSTALLATION
TASK 25-62-03-410-801
1. Regulatory Requirements and Guidelines
SUBTASK 25-62-03-990-001
A. TSO C126, Paragraph D
(1) TSO approval of the ELT does not constitute installation approval. All ELT installations are
subject to field approval for a given airframe by either an approved FAA DER or FAA FSDO.
For installations outside the US, contact your local civil aviation regulatory agency for details.
(a) The remote switch is a requirement of TSO C126 and installation is not optional.
(b) The buzzer is a requirement of TSO C126 and installation is not optional.
SUBTASK 25-62-03-990-002
B. FAA
(1) This manual constitutes supporting data, as described in AC43.9-1, Paragraph 6.h.(2) and AC
43-210, Chapter 2, Paragraph 201(a)(6), and as such may be used as support for FAA field
approval of the ELT installation.
(2) In addition to the procedures outlined herein and in accordance with FAR Part 43, the installer
must adhere to the aircraft manufacturer’s instructions and recommendations and the
guidelines provided by FAA Advisory Circular AC 43.13-2 “Acceptable Methods, Techniques,
and Practices - Aircraft Alterations”, specifically Chapters 1 through 3, 11, and 13.
(3) By signing the aircraft logbook, and FAA Form 337, the installer is stating the installation has
been performed in accordance with current FAR requirements and the procedures outlined
herein. The completed Form 337 is provided to the FAA and also becomes a permanent part of
the aircraft maintenance records in accordance with AC43-9, Paragraph 17.
SUBTASK 25-62-03-990-003
C. Canada
(1) All installations must be performed in accordance with Canadian Aviation Regulations (CAR)
Part V, Chapter 551, Paragraph 551.104.
SUBTASK 25-62-03-990-004
D. Other Countries
(1) Installations in aircraft outside of the United States and Canada, must be performed in
accordance with applicable regulatory authority rules and regulations.
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DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
SUBTASK 25-62-03-990-005
E. RTCA
(1) DO-204, § 3.1.8 guidelines for mounting a ELT:
(a) The ELT shall be mounted to primary aircraft load carrying structures, such as trusses,
bulkheads, longerons, spars, or floor beams.
(b) The mounts shall have a maximum static local deflection no greater than 0.1 inches (2.5
mm) when a force of 100 lbs (450 newtons) is applied to the mount in the most flexible
direction. Deflection measurements shall be made with reference to another part of the
aircraft not less than 1 foot (0.3 meters) nor more than 3 feet (1.0 meters) from the
mounting location.
(2) DO-182, § 6.2.2.b recommends that:
(a) To maximize the probability of the ELT transmitting a detectable signal after a crash, all
ELT system components, which must survive a crash intact, e.g., transmitter and
external antenna, should be attached to the airframe in such a manner that the
attachment system can support a 100
100, etc.) applied through the center of gravity of the component (ELT, antenna, etc.) in
the plus and minus directions of the three principal axes of the aircraft.
B406-4 (453-5004)
g
load, (ELT weight x 100, ELT antenna weight x
(b) Post-crash critical components of the ELT system, e.g., transmitter and external
antenna, should be mounted as close to each other as possible.
(c) The antenna coax cable should not cross any production breaks, e.g., major structure
sections, such that the ELT and antenna are in the same section of the aircraft and as
close together as possible.
(d) If the ELT and external antenna are on opposite sides of an airframe production break,
the components should be secured to each other by a tether that can support a 100
load (ELT weight x 100). The interconnecting antenna-to-ELT coax cable should have
sufficient slack on both ends that it will not be subjected to any tensile load and should
be tied loosely to the tether.
g
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FLIGHT
5.21
(132)
1.71
(43)
11.63
(295)
5.50
(140)
3.42
(87)
2.00
(51)
3.76
(96)
3.90
(99)
0.17 (4) Ø MOUNTING
HOLES (4 PLCS)
Dimensions in inches (mm)
NOTE: Allow a minimum of
5 inches (127 mm) of clearance
in front of the mounting frame cap
to facilitate cap removal.
DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
TASK 25-62-03-450-801
2. Mounting Tray
SUBTASK 25-62-03-450-001
A. Location
B406-4 (453-5004)
CAUTION
: MANY ORIGINAL ELT INSTALLATIONS ARE INADEQUATE AS FAR AS UNIT LOCATION
AND SURFACE RIGIDITY ARE CONCERNED. BECAUSE OF THE CRITICAL FUNCTION AN
ELT PERFORMS, IT IS IMPORTANT THE INSTALLATION FOLLOWS THE INSTRUCTIONS
AND RECOMMENDATIONS HEREIN.
CAUTION
: THE MOUNTING SURFACE MUST BE EXTREMELY RIGID; THEREFORE, MOUNTING AN
ELT DIRECTLY TO THE AIRCRAFT SKIN IS UNACCEPTABLE. MOUNTING THE ELT
DIRECTLY TO THE AIRCRAFT SKIN INDUCES “CRASH HIDING” VIBRATIONS AND
PROVIDES A VERY POOR MOUNTING SURFACE.
CAUTION
: AVOID LOCATING THE ELT WHERE IT WILL BE SUBJECTED TO UNPROTECTED
EXPOSURE TO HARSH CHEMICAL FLUIDS SUCH AS DEICING COMPOUNDS. THESE
TYPES OF CHEMICAL FLUIDS CAN PROMOTE CRACKING AND FRACTURING OF THE
ELT MOUNTING FRAME AND HOUSING COMPONENTS BY DEGRADING THE
STRUCTURAL INTEGRITY OF THESE COMPONENTS. THESE SAME CHEMICAL AGENTS
MAY ALSO CAUSE CORROSION OF ELECTRICAL CONNECTIONS.
(1) Select a suitable location for the mounting tray. See Figure 12. B406-4 ELT Outline and
Dimensions. Refer to these dimensions when determining mounting location.
Figure 12. B406-4 ELT Outline and Dimensions
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8-32 x 5/8 SCREW
(4 PLCS)
#8 FLAT WASHER
(4 PLCS)
#8 LOCK WASHER
(4 PLCS)
8-32 X 1/4 HEX NUT
(4 PLCS)
AIRFRAME
STRUCTURE (REF.)
EQUIPMENT MOUNTING
PLATE (REF.)
MOUNTING
TRAY
DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
(2) Locate the mounting tray such that the ELT mounting frame cap has at least 5 inches (127
mm) of clearance for installation and removal.
(3) Mount the ELT as far aft as practical, but where it can be easily retrieved for maintenance.
NOTE
: Statistics show that the tail section of an airplane is likely to be less damaged during
a crash; therefore, providing a good mounting environment for the ELT.
(4) Additional installation guidance may be found in AC 43.13-2, Chapter 2, Paragraph 28, which
specifically addresses ELT installations.
SUBTASK 25-62-03-450-002
B. Installation
(1) See Figure 13. Typical Mounting Tray Installation.
B406-4 (453-5004)
Figure 13. Typical Mounting Tray Installation
(2) Install the necessary mounting structure as appropriate for the specific installation.
(3) Align the mounting tray (452-5050) on the mounting structure, such that the arrow on the
tray is within 10° of the longitudinal axis of the aircraft and pointing in the direction of flight.
(4) Mark the four holes needed for mounting the tray, using the tray as a pattern. The hole
pattern is also illustrated in Figure 12. B406-4 ELT Outline and Dimensions on page 56.
(5) Drill the four mounting holes with a #19 or 4.25 mm drill.
(6) Install the mounting tray with the 8-32 x 5/8” SS pan head phillips screws, flat washers, lock
washers, and nuts provided in the installation kit (455-7421), as shown in Figure 13. Typical
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DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
B406-4 (453-5004)
Mounting Tray Installation. Torque to 12 ±1 lb-in (136 ± 11 N•cm).
NOTE
: The use of substitute mounting hardware is acceptable provided the hardware used
meets or exceeds the strength and corrosion resistance of the original hardware.
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DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
TASK 25-62-03-450-802
3. Antenna
SUBTASK 25-62-03-990-001
A. Selection
(1) Use only antennas approved for use with the B406-4 ELT. The ELT will not work properly
without being connected to an antenna for which it was designed.
(2) Verify the antenna selected matches the requirements of the specific installation.
Considerations include aircraft maximum rated speed, location restrictions, and any other
considerations specific to the installation.
SUBTASK 25-62-03-450-001
B. Location
(1) Select a suitable location for the antenna.
B406-4 (453-5004)
(a) Place the antenna in a location where the antenna can be installed within 15° of vertical
and with at least 30 inches (762 mm) of clearance from other antennas, particularly
VHF, in accordance with RTCA/DO-204, § 3.1.10.2.
NOTE
: AC 43.13-2, Chapter 3 recommends a minimum distance of 36 inches (914
mm) clearance between antennas.
(b) Additional location guidance may be found in AC 43.13-2, Chapter 3, which deals
specifically with antenna installations.
SUBTASK 25-62-03-450-002
C. Installation
NOTE
: Refer to the airframe manufacturer’s written instructions and AC 43.13-2, Chapter 3 for antenna
installation practices and requirements.
(1) Install a doubler plate if necessary to meet rigidity requirements. A 20 lb (9.1 kg) force applied
to the antenna in all directions should not cause an appreciable distortion in the aircraft skin.
(2) Install a ground plane if necessary. In certain applications, particularly those where antennas
are installed on composite, fabric, or wood airframes, a ground plane is required.
(3) Drill the antenna mounting holes and coax connector holes referring to the appropriate
antenna illustration for hole patterns and hole sizes.
(a) See Figure 14. Rod Antenna 110-320 and Blade Antenna 110-328-01 Outlines and
Dimensions on page 60, Figure 15. Blade Antennas 110-333 and 110-337 Outlines and
Dimensions on page 61, and Figure 16. Blade Antenna 110-337-11 Outline and
Dimensions on page 62.
(4) Mount the antenna referring to the appropriate antenna illustration for hardware
requirements, torque, and other applicable installation requirements.
(5) Two coax cables, 6 feet (1.8 m) long, are provided as part of the ELT kit. The 121.5/243.0
MHz cable has BNC connectors and the 406 MHz cable has TNC (antenna) and TPS (ELT)
connectors.
25-62-03
Page 59 of 87
JUN 20/13
ACR ELECTRONICS, INC / ARTEX PRODUCTS
13.00
(330)
3.5
(89)
3.3
(84)
RF CONNECTOR
TNC FEMALE
15.50 MAX
(394)
2.70 MAX
(69)
1.625 (41.3)
0.812 (20.6)
0.750 (19.1)
0.90 (23)
1.750 (44.5)
4.40 MAX
(112)
RF CONNECTOR
BNC FEMALE
4 - 100° CSK HOLES
Ø 0.170 (4.3)
110-320
Dimensions in inches (mm)
C.G.
INSTALLATION NOTES:
1. MOUNT ANTENNA USING #8-32 SS 100° C’SK
MACHINE SCREWS AND ASSOCIATED
HARDWARE.
TORQUE TO 20 ±1 LB-IN (226 ±11 N•cm)
2. PROVIDE 0.625 (5/8”) (16 MM) Ø HOLE
BNC CONNECTOR AND 0.703 (45/64”)
(17.9 MM) Ø HOLE FOR TNC CONNECTOR.
3. PROVIDE 0.182 (4.6 MM) Ø HOLES (4 PLCS)
FOR ATTACHING SCREWS.
4. APPLY A LAYER OF ANTI-CORROSION BONDING
GREASE BETWEEN AICRAFT AND ANTENNA BASE.
5. GASKET NOT SUPPLIED AND USE OPTIONAL.
REQUEST P/N 280-0320 IF ONE IS DESIRED.
GASKET (OPTIONAL)
1.300 (33.0)
9.00 MAX
(229)
6.50
(165)
5.10
(130)
2.70
(69)
5.47
(139)
RF CONNECTOR
BNC FEMALE
RF CONNECTOR
TNC FEMALE
RUBBER AND CORK GASKET
0.062 (2) THICK
8.40 (213)
6.000 (152.4)
5.58 (142)
1.620 (41.1)
3.000 (76.2)
1.10 (28)
1.500 (38.1)
1.250 (31.8)
0.625 (15.9)
110-328-01Dimensions in inches (mm)
1.125 (28.6)
0.5625 (14.3)
INSTALLATION NOTES:
1. MOUNT ANTENNA USING #10-32 SS 100º C’SK
MACHINE SCREWS AND ASSOCIATED
HARDWARE.
2. PROVIDE 0.625 (5/8”) (16 MM) Ø HOLE FOR
BNC CONNECTOR AND 0.703 (45/64”) (17.9 MM)
∅ HOLE FOR TNC CONNECTOR.
3. PROVIDE 0.213 (5.4 MM) Ø HOLES (6 PLCS)
FOR ATTACHING SCREWS.
4. IF GASKET IS REMOVED, APPLY A LAYER OF ANTICORROSION GREASE BETWEEN AICRAFT
AND ANTENNA BASE.
DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
B406-4 (453-5004)
Figure 14. Rod Antenna 110-320 and Blade Antenna 110-328-01 Outlines and Dimensions
25-62-03
Page 60 of 87
JUN 20/13
DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
3.74 EST
(95)
3.8 MAX
(97)
10.1 MAX
(257)
4.90
(125)
2.381
(60.5)
0.900 (22.9)
1.189 (30.2)
1.380 (35.1)
1.060 (27.0)
2.05 MAX (52)
0.200 - 0.207 (5.1 - 5.3) Ø (6 PLCS)
SPOT FACED Ø 0.5 (13)
Dimensions in inches (mm)
110-333
3.07 EST
(80)
INSTALLATION NOTES:
1. MOUNT ANTENNA USING #10-32 SS MACHINE
SCREWS AND ASSOCIATED HARDWARE
72548(72/%,11FP
2. PROVIDE 0.625 (5/8”) (16 MM) Ø HOLE FOR
BNC CONNECTOR AND 0.703 (45/64”) (17.9 MM)
HOLE FOR TNC CONNECTOR.
3. PROVIDE 0.213 (5.4 MM) Ø HOLES (6 PLCS)
FOR ATTACHING SCREWS.
4. APPLY A LAYER OF ANTI-CORROSION BONDING
GREASE BETWEEN AICRAFT AND ANTENNA
BASE.
5. GASKET IS NOT SUPPLIED AND USE IS
OPTIONAL. CONTACT ARTEX AND REQUEST
P/N 183-1622 IF ONE IS DESIRED.
RF CONNECTOR TNC FEMALE
RF CONNECTOR BNC FEMALE
0.500 (12.7)
0.500 (12.7)
C.G.
7.75
(197)
30º
15º
2.70
(69)
2.89
(73)
2.25
(57)
0.562 (14.3)
8.25
(210)
6.000
(152.4)
3.000
(76.2)
1.620 (41.2)
1.500
(38.1)
0.750 (19.1)
1.25 (32)
0.625 (15.9)
0.201 (5.1) Ø (6 PLCS)
RF CONNECTOR BNC FEMALE
Dimensions in inches (mm)
C.G.
INSTALLATION NOTES:
1. MOUNT ANTENNA USING #10-32 SS MACHINE
SCREWS AND ASSOCIATED HARDWARE.
72548(72/%,11FP
2. PROVIDE 0.625 (5/8”) (16 MM) Ø HOLE FOR
BNC CONNECTOR AND 0.703 (45/64”) (17.9 MM)
HOLE FOR TNC CONNECTOR.
3. PROVIDE 0.213 (5.4 MM) Ø HOLES (6 PLCS)
FOR ATTACHING SCREWS.
4. BONDING THROUGH MOUNTING SCREWS
NOT REQUIRED.
5. APPLY A LAYER OF ANTI-CORROSION BONDING
GREASE BETWEEN AICRAFT AND ANTENNA BASE.
6. GASKET NOT SUPPLIED AND USE OPTIONAL.
REQUEST P/N 280-0340 IF ONE IS DESIRED.
1.160 (29.5)
5.580
(141.7)
RF CONNECTOR
TNC FEMALE
ACR ELECTRONICS, INC / ARTEX PRODUCTS
B406-4 (453-5004)
110-337
Figure 15. Blade Antennas 110-333 and 110-337 Outlines and Dimensions
25-62-03
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JUN 20/13
ACR ELECTRONICS, INC / ARTEX PRODUCTS
DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
B406-4 (453-5004)
INSTALLATION NOTES:
1. MOUNT ANTENNA USING #10-32 SS MACHINE SCREWS AND
ASSOCIATED HARDWARE AND TORQUE TO 20 IN/LBS.
2. PROVIDE A 5/8" (.625") DIAMETER HOLE FOR THE BNC CONNECTOR.
3. PROVIDE A 5/8" (.625") DIAMETER HOLE FOR THE TNC CONNECTOR.
4. A LAYER OF ANTI-CORROSION BOUNDING GREASE SHOULD BE
APPLIED BETWEEN THE AIRCRAFT AND THE BASE OF THE ANTENNA
5. THIS ANTENNA IS BOUNDED THRU THE MOUNTING SCREWS.
6. GASKET IS NOT SUPPLIED AND USE IS OPTIONAL.
CONTACT ACR/ARTEX AND REQUEST PART #280-0340 IF ONE IS DESIRED.
7.85
(199)
30º
15º
Dimensions in inches (mm)
Figure 16. Blade Antenna 110-337-11 Outline and Dimensions
TASK 25-62-03-450-803
4. Remote Switch Panel
SUBTASK 25-62-03-450-001
A. Location
NOTE
: In most cases, panel space and wiring have been pre-provisioned by the aircraft
manufacturer for the G737 control panel (remote switch panel assembly); however, location
and installation requirements are defined for installations in aircraft not pre-provisioned for
this remote switch panel.
RF CONNECTOR BNC FEMALE
1.25 (32)
0.750 (19.1)
1.500
(38.1)
1.620 (41.2)
1.160 (29.5)
0.625 (15.9)
3.000
(76.2)
5.580
(141.7)
6.000
(152.4)
8.25
(210)
RF CONNECTOR
TNC FEMALE
0.201 (5.1) Ø (6 PLCS)
0.562 (14.3)
2.25
(57)
110-337-11
(1) The Control Panel G737 (453-0161) must be mounted in the cockpit where the pilot can easily
reach the switch and see the status light.
(2) The panel assembly requires a space approximately 5.74 x 2.24 in. (146 x 57 mm) on the
panel or console surface, with a depth of 3.00 in. (77 mm), excluding room for the harness
Page 62 of 87
25-62-03
JUN 20/13
ACR ELECTRONICS, INC / ARTEX PRODUCTS
CONTROL PANEL
ARTEX AIRCRAFT SUPPLIES,INC
ON
ELT
ELT
ARM
5.74
(146)
5.365
(136.3)
0.185 (4.7)
0.555 (14.1)
1.125 (28.6)
2.24
(57)
4.969
+0.030
-0.000
(126.2 +0.8/-0.0)
3.000 ±0.015
(76.2 ±0.4)
1.13 (29) MAX.
0.69 (18) MAX.
0.37 (9) MIN.
0.06 (2) MIN.
2.094
+0.030
-0.000
(53.2+0.8/-0.0)
FRONT VIEW
TOP VIEW
BACK VIEW
453-0161
DIMENSIONS IN INCHES (MM)
FASTENERS (4)
280-0010
(DZUS PA35-38X1426)
DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
connection. See Figure 17. Remote Switch Panel Assembly Outline and Dimensions.
Figure 17. Remote Switch Panel Assembly Outline and Dimensions
SUBTASK 25-62-03-450-002
B. Installation
(1) Provide an opening in the instrument panel or other mounting location which meets the
dimensional requirements shown in Figure 17. Remote Switch Panel Assembly Outline and
Dimensions.
B406-4 (453-5004)
(2) Mount Dzus rails on the sides of the opening, if necessary. See Figure 17. Remote Switch
Panel Assembly Outline and Dimensions for rail center line dimensions.
(3) Install the remote switch panel assembly.
NOTE
: Step (3) may be completed after wiring is completed on the ELT end and the harness
plug has been plugged into the panel assembly, in accordance with the requirements
of SUBTASK 25-62-03-450-008 on page 70. If such is the case, perform a fit check at
this time.
(4) Apply a “For Aviation Emergency Use Only/Unauthorized Use Prohibited” placard as close to
the switch as practical, if required.
NOTE
: This placard is recommended for installations on aircraft that are not pre-placarded
for remote ELT control. If desired, the placard (591-0428) may be ordered from ACR
Electronics Division.
TASK 25-62-03-450-804
5. Buzzer
SUBTASK 25-62-03-450-001
A. Location
CAUTION
(1) Select a suitable location for the buzzer.
: PLACING THE BUZZER IN THE COCKPIT IS NOT RECOMMENDED DUE TO THE
POTENTIAL FOR DISTRACTION. THE BUZZER PRODUCES A LOUD, SIREN-TYPE
SOUND WHEN THE ELT IS ACTIVATED. SINCE THE BUZZER OPERATES IN TANDEM
WITH THE COCKPIT LED, IT WOULD ONLY SERVE AS A REDUNDANT WARNING
INDICATOR IN THE COCKPIT.
25-62-03
Page 63 of 87
JUN 20/13
ACR ELECTRONICS, INC / ARTEX PRODUCTS
1.68
(43)
1.75
(45)
1.115
(28.3)
PANEL MOUNTING NUT
0.445
(11.3)
FRONT VIEW
SIDE VIEW (Rotated 90°)
Dimensions are
reference only
130-4005
HORN MOD ELT BUZZER
í
+
BLUE
RED
YELLOW
BLACK
RTV
DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
: The buzzer may be located anywhere in the aircraft; however, the recommended
NOTE
location is near the ELT, as the buzzer is loud enough to be heard outside the aircraft
when the engine(s) is not running. When the engine(s) is running, the LED on the
cockpit remote switch panel will warn the pilot the ELT is active.
SUBTASK 25-62-03-450-002
B. Installation
(1) Fabricate a bracket suitable for supporting the buzzer. See Figure 18. Buzzer Outline and
Dimensions.
NOTE
: Refer to the aircraft manufacturer’s written instructions or AC 43.13-2, as applicable,
for approved bracket fabrication and installation methods.
B406-4 (453-5004)
Figure 18. Buzzer Outline and Dimensions
(2) Attach the bracket to the airframe such that the buzzer is adequately supported and does not
show any significant evidence of distorting the airframe skin.
(3) Install the buzzer in the bracket.
(a) Remove the panel mounting nut and insert the buzzer in the bracket.
(b) Install the panel mounting nut and tighten it securely.
25-62-03
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JUN 20/13
ACR ELECTRONICS, INC / ARTEX PRODUCTS
DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
B406-4 (453-5004)
TASK 25-62-03-450-805
6. Wiring
SUBTASK 25-62-03-990-001
A. General Considerations and Recommendations
CAUTION
CAUTION
CAUTION
(1) The following wiring and grounding considerations and recommendations are applicable:
: IF GROUND OR OTHER CONNECTIONS ARE BROKEN OR OTHERWISE DAMAGED, THE
ELT IS STILL CAPABLE OF AUTOMATIC ACTIVATION; HOWEVER, THE COCKPIT
REMOTE SWITCH MAY BE INCAPABLE OF RESETTING THE ELT AND OPERATION MAY
NOT BE INDICATED ON THE REMOTE SWITCH LED.
: INCORRECT TERMINATION OF THE WIRING IN THE CONNECTORS MAY DAMAGE THE
ELT, CAUSE TRANSMISSION ISSUES, OR RESULT IN A NON-FUNCTIONING REMOTE
SWITCH. VERIFY THE WIRING AGAINST THE WIRING DIAGRAM AND PERFORM A
CONTINUITY CHECK TO CONFIRM GOOD CONNECTIONS AND PROPER PIN
LOCATIONS.
: TO PREVENT INADVERTENT ELT ACTIVATION OR POSSIBLE COMPONENT DAMAGE,
DO NOT CONNECT THE HARNESS TO THE ELT OR COCKPIT REMOTE SWITCH PANEL
UNTIL ALL POWER AND GROUND WIRING CONNECTIONS ARE COMPLETED.
(a) Minimum 22 AWG wire size.
(b) Shielding is recommended to help prevent EMI and RF interference.
(c) Use high quality conductor meeting MIL-W-16878, M22759, M27500, or a commercial
equivalent acceptable for use in aircraft applications.
(d) Provide a “Drip Loop” in the remote switch harness connection to the ELT to divert
moisture from the connector. See TASK 25-62-03-990-805 on page 21 for a definition.
(e) Provide a “Service Loop” in the remote switch harness connection to the remote switch
panel, such that the assembly can be withdrawn from the panel far enough to easily
disconnect the harness plug. See TASK 25-62-03-990-805 on page 21 for a definition.
(f) ELT and remote switch panel grounds must be common to aircraft ground.
SUBTASK 25-62-03-450-001
B. Remote Switch Panel Harness Fabrication and Installation
(1) In most cases, the aircraft has been pre-provisioned with wiring for connecting the ELT to the
G737 control panel (remote switch panel assembly). Install a remote switch panel harness in
accordance with the following instructions ONLY if wiring has not been provided and/or spare
wires are not available.
NOTE
: If spare wires are used, terminate the wires in accordance with Figure 19. Remote
Switch Panel Harness Wiring Diagram on page 66, and the procedures herein.
NOTE
: If an ELT/NAV Interface -B (453-6501) is being installed with the ELT, refer to the
“ELT/NAV Interface -B Description, Operation, Installation and Maintenance Manual”
(570-6501) for additional wiring instructions.
25-62-03
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JUN 20/13
ACR ELECTRONICS, INC / ARTEX PRODUCTS
PIN INSERTION END OF MOLEX
CONNECTOR FOR ELT.
HOLE NUMBERING SAME
AS INSCRIBED ON ACTUAL
CONNECTOR.
PIN INSERTION END OF MS24266R16B24S7
CONNECTOR FOR REMOTE PANEL
ASSEMBLY. HOLE NUMBERING SAME
AS INSCRIBED ON ACTUAL CONNECTOR.
12963
1185
2
10
7
41
2 ELT ON
YELLOW
RED
BLACK
BLUE
3 RESET1
6 RESET2
1 LIGHT
8
4+28V/+16V
+28V
AURAL CHIME
MASTER CAUTION +17V
MASTER CAUTION PULSE
DC GROUND
MASTER CAUTION STEADY STATE
MASTER LIGHTING TEST
5VAC LIGHTING
AC GROUND
6
10
9
11
3
1
12
13
14
7
2
5
8
15
5
7 EXTERNAL ON
11 AIRCRAFT GROUND
(W/O ELT/NAV INTERFACE)
USE MINIMUM 22 AWG WIRE
NOTE:
ENSURE ALL GROUNDS
ARE COMMON. TIE PANEL
PIN 9 TO ELT PIN 11 IF
GROUND INTEGRITY CANNOT
BE GUARANTEED BETWEEN
ELT AND REMOTE PANEL.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
NOTE: SHIELD OPTIONAL
CONTROL PANEL G737
(453-0161)
B406-4 ELT
(453-5004)
HORN
G-SWITCH LOOP
AIRCRAFT BATTERY
+28VDC
NOTE: IF HORN IS NOT USED, CONNECT
REMOTE SWITCH CONTROL PANEL PIN 8
DIRECTLY TO ELT PIN 2.
DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
B406-4 (453-5004)
Figure 19. Remote Switch Panel Harness Wiring Diagram
25-62-03
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ACR ELECTRONICS, INC / ARTEX PRODUCTS
DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
B406-4 (453-5004)
(2) Fabricate a 4-wire harness long enough to reach from the ELT to the cockpit remote switch
panel, allowing enough slack to provide a drip loop at the ELT end and a service loop at the
cockpit remote switch panel end.
NOTE
: A 5 or 6-wire harness may be necessary if a ground wire is connected between ELT
Pin 11 and remote switch panel Pin 9; and/or ELT Pin 2 must be connected to remote
switch panel Pin 8 if a horn is not installed. See Figure 19. Remote Switch Panel
Harness Wiring Diagram on page 66.
(a) Strip approximately 0.15 in. (3 mm) of insulation from the ends of each of the harness
wires.
(b) Dress and tin the bare wires to prevent the strands from fraying during terminal
crimping operations.
(3) Fabricate the additional wires needed to connect the remote switch panel; referring to Figure
19. Remote Switch Panel Harness Wiring Diagram on page 66, and the aircraft wiring
diagrams to determine appropriate connection points.
(a) Pin 3 to the selected +28V aircraft power source.
(b) Pin 4 to the selected +28V/+16V aircraft power source.
(c) Pin 6 to the Master Caution +17V circuit.
(d) Pin 8 to the BLUE wire on the buzzer (i.e., horn).
(e) Pin 9 to aircraft ground.
(f) Pin 10 to the Master Caution Pulse circuit.
(g) Pin 11 to the Master Caution Steady State circuit.
(h) Pin 12 to the Master Lighting Test circuit.
(i) Pin 13 to the 5VAC Lighting circuit.
(j) Pin 14 to aircraft ground.
(k) Prepare the wires as described in Steps (2)(a) and (2)(b).
(4) Terminate the remote switch panel end of all wires in an MS24266R16B24S7 connector in
accordance with the aircraft manufacturer’s written instructions or AC43.13-1, as applicable.
See Figure 19. Remote Switch Panel Harness Wiring Diagram on page 66.
NOTE
: Identify the wires and connector pin relationships, such that the wiring can be
terminated at the appropriate locations.
(5) Install the remote switch panel harness as follows:
(a) Bundle the wiring into a complete harness, with breakouts as appropriate, such that the
wiring can be properly supported and attached to the airframe. Refer to the aircraft
manufacturer’s written instructions or AC 43.13-1, Chapter 11, § 9 through 12, as
applicable.
(b) Route the wire bundle through the airframe.
(c) Support the wire bundle by clamping or other suitable means, such that the wiring is
properly supported and protected from chaffing and strain. Refer to the aircraft
25-62-03
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ACR ELECTRONICS, INC / ARTEX PRODUCTS
DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
manufacturer’s written instructions or as described in AC 43.13-1, Chapter 11, § 9
through 12, as applicable.
(6) Terminate the aircraft side of the wires fabricated in Step (3) at the appropriate connection
points in accordance with the aircraft manufacturer’s written instructions or AC 43.13-1, as
applicable. See Figure 19. Remote Switch Panel Harness Wiring Diagram on page 66, and
aircraft wiring diagrams.
(7) Refer to SUBTASK 25-62-03-450-003 for wire termination instructions at the ELT end of the
remote switch panel harness.
SUBTASK 25-62-03-450-002
C. Buzzer Wiring Fabrication
(1) Fabricate the following wires, which correspond with the wires on the buzzer:
NOTE
: Use appropriately coded wires, such that the wires can be identified and terminated
at the appropriate locations.
(a) YELLOW wire to harness ELT receptacle.
B406-4 (453-5004)
(b) BLACK wire to aircraft ground.
(c) RED wire to +28VDC aircraft battery power source.
(d) BLUE wire to Pin 8 of the remote switch panel connector.
(e) Strip approximately 0.15 in. (3 mm) of insulation from the ends of each of the harness
wires.
(f) Dress and tin the bare wires to prevent the strands from fraying during terminal
crimping operations.
(2) Splice the fabricated wires to the buzzer wires in a manner acceptable to the aircraft
manufacturer, or as described in AC 43.13-1, Paragraph 11-167, as applicable.
(3) Support the wiring by clamping or other suitable means, such that the wiring is properly
supported and protected from chaffing and strain. Refer to the aircraft manufacturer’s written
instructions or as described in AC 43.13-1, Chapter 11, § 9 through 12, as applicable.
SUBTASK 25-62-03-450-003
D. ELT 12-Pin Receptacle Wiring Fabrication and Installation
(1) Fabricate a ground wire long enough to reach from the harness ELT receptacle to aircraft
ground.
NOTE
: This wire will be crimped in the same pin as the wire running from Pin 11 of the ELT
receptacle to the cockpit remote switch panel, ONLY if a ground wire is connected
between the ELT and the remote switch panel. Alternatively, the wires may be
spliced in a manner acceptable to the aircraft manufacturer, or as described in AC
43.13-1, Paragraph 11-167, as applicable.
(2) Feed the harness wires on the ELT end through the mounting frame cap assembly (452-
5052). See Figure 20. Remote Switch Panel Harness Wiring at ELT End.
25-62-03
Page 68 of 87
JUN 20/13
ACR ELECTRONICS, INC / ARTEX PRODUCTS
PIN 1
12-PIN MOLEX
RECEPTACLE
NOTE: FEED THE WIRE BUNDLE THROUGH THE MOUNTING
FRAME CAP HOLE PRIOR TO INSERTING THE PINS INTO THE
RECEPTACLE
TO COCKPIT REMOTE
PANEL AND GROUND
DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
B406-4 (453-5004)
NOTE: Prior to installing the 12-pin ELT receptacle onto the harness, the wires connecting to
the ELT must be routed through the rectangular hole in the ELT mounting frame cap.
The cap retains the receptacle when installed and the receptacle will not fit through
the mounting cap harness entrance.
(3) Feed the buzzer wire (YELLOW) on the ELT end through the mounting frame cap.
(4) Fabricate a short jumper, approximately 1.5 in. (38 mm) long, using minimum 22 AWG wire.
(a) Strip approximately 0.15 in. (3.3 mm) of insulation from both ends of each of the wire.
(b) Dress and tin the bare wire ends to prevent the strands from fraying during terminal
crimping operations.
Figure 20. Remote Switch Panel Harness Wiring at ELT End
(5) Crimp male terminal pins (151-6627) to each of the wire ends, using Molex crimp tool 63811-
3300, or an equivalent tool for 0.062 in. terminal pins.
(6) Insert the terminal pins in the harness ELT Molex 12-pin receptacle (151-5012), as follows.
See Figure 19. Remote Switch Panel Harness Wiring Diagram on page 66.
CAUTION
: THE ELT WILL NOT AUTOMATICALLY ACTIVATE IF THE JUMPER (G-SWITCH
LOOP) IS NOT PROPERLY INSTALLED IN THE HARNESS ELT RECEPTACLE.
(a) Insert the jumper ends in Pin 5 and Pin 8 of the receptacle.
NOTE
: Terminal pins may be removed from the receptacle using Molex extraction tool
11030002, or equivalent.
(b) Insert the harness ELT wire ends into the receptacle. See Figure 19. Remote Switch
Panel Harness Wiring Diagram on page 66.
Page 69 of 87
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ACR ELECTRONICS, INC / ARTEX PRODUCTS
DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
(c) Ring out the wiring between the remote switch panel and the ELT, verifying proper
continuity.
(d) Insert the buzzer wire (YELLOW) in Pin 2 of the receptacle.
SUBTASK 25-62-03-450-004
E. Coax Cables Installation
(1) Route the two antenna coax cables through the airframe.
NOTE
: Cables, up to 20 feet (6.1 m), may be fabricated. Use RG-142 or RG-400 coax cable.
(2) Support the coax cables by clamping or other suitable means, such that they are properly
supported and protected from chaffing and strain. Refer to the aircraft manufacturer’s written
instructions or as described in AC 43.13-1, Chapter 11, § 9 through 12, as applicable.
SUBTASK 25-62-03-450-005
F. Antenna Connections
B406-4 (453-5004)
(1) Connect the two coax cables to the antenna, making sure the cables are routed and
supported, such that there is no tensile load (i.e., strain) on the connections.
SUBTASK 25-62-03-450-006
G. Airframe Ground Connections
(1) Connect the ground wires to the airframe in accordance with the aircraft manufacturer’s
written instructions or as described in AC 43.13-1, Chapter 11, § 15, as applicable. See Figure
19. Remote Switch Panel Harness Wiring Diagram on page 66.
SUBTASK 25-62-03-450-007
H. Buzzer Connections
(1) Connect the RED wire to the +28 VDC aircraft battery power source.
(2) Connect the BLUE wire to remote switch panel plug Pin 8.
(3) Connect the YELLOW wire to ELT receptacle Pin 2.
(4) Connect the BLACK wire to aircraft ground. See SUBTASK 25-62-03-450-006.
SUBTASK 25-62-03-450-008
I. Remote Switch Panel Final Installation
(1) Connect the remote switch panel harness plug the remote switch panel.
(2) Install the remote switch panel assembly, referring to SUBTASK 25-62-03-450-002 on page
63.
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PROTECTIVE TOP
COVER ASSY
MOUNTING FRAME
CAP ASSY
ELT MAIN
ASSY
MOUNTING
TRAY ASSY
CONNECT COAX
CABLE
CONNECT HARNESS
1
TIGHTEN THUMBSCREW
(2 PLCS)
Tighten to no more than
18 lb-in (203 Ncm)
2
3
5
6
7
NOTE: Coax cables and
wiring harness not
shown for clarity.
CONNECT COAX
CABLE
4
DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
TASK 25-62-03-410-802
7. ELT Installation
SUBTASK 25-62-03-410-001
A. Installation and Test
(1) See Figure 21. ELT Installation Sequence.
B406-4 (453-5004)
Figure 21. ELT Installation Sequence
(2) Verify the ELT local switch is in the “OFF” position.
(3) Insert the ELT into the mounting tray at an angle, such that the locking ears at the end
opposite the direction-of-flight arrow fit into the mounting tray locking slots.
(4) Press the ELT down until it is fully seated in the mounting tray.
(5) Install the protective top cover assembly (452-3052) on the ELT by fitting the cover locking
slots over the locking ears on the ELT.
(6) Push the cover toward the connector end of the ELT and seat it down in place on the ELT.
(7) Route the antenna coax cables through the appropriate mounting frame cap access holes.
(8) Connect the antenna coax cables to the ELT.
(9) Connect the 12-pin harness receptacle to the ELT.
(10) Slide the mounting frame cap into place over the mounting tray and protective top cover.
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DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
B406-4 (453-5004)
(11) Secure the mounting frame cap to the mounting tray with the thumbscrews and tighten them
to no more than 18 lb-in (203 N•cm).
(12) Tie up excess slack in the harness and coax cables, such that they form drip loops and there is
enough slack, approximately 5 in. (127 mm), to allow the mounting frame cap to be easily
pulled back.
NOTE
: Steps (1) through (11) are applicable any time the ELT has been removed and
undergoes reinstallation. Step (12) is only applicable at initial installation or if the
wiring and/or coax cables have been disturbed.
(13) Test the ELT installation in accordance with the requirements of SUBTASK 25-62-03-750-011
on page 45.
NOTE
: It is very important that the cockpit remote switch panel light illuminates immediately
upon ELT activation. If the light fails to illuminate immediately and stay on steady,
recheck the interface wiring and connections between the ELT and the remote switch
panel. The ELT local LED flashes every 3-4 seconds.
NOTE
: If verification of the digital message (i.e., 406 MHz Burst) is desired, follow the
procedures outlined in SUBTASK 25-62-03-750-009 on page 44.
SUBTASK 25-62-03-450-001
B. Harness ELT Receptacle Sealing
(1) Seal the harness receptacle at the ELT end to prevent moisture from penetrating the
connection, thus preventing water from beading up and causing bridging between connector
pins resulting in possible activation of the ELT. Use the following procedure:
NOTE
: Perform the sealing process once all tests have been satisfactorily completed and all
harness connections have been verified to be correct.
(a) Remove the mounting frame cap from the ELT.
(b) Unplug the receptacle from the ELT or pull the receptacle free of the mounting frame
cap, as applicable.
(c) Seal the back of the receptacle with GE RTV 162, or equivalent, such that moisture
cannot penetrate the backside of the receptacle around the terminal pins.
(d) Apply Dow Corning® 4 Electrical Insulating Compound, or an equivalent meeting MIL-S-
8660C, around the receptacle pins, such that the pin area is filled with compound.
(e) Plug the harness receptacle into the ELT.
(f) Wipe up excess sealing compound.
(g) Reinstall the mounting frame cap torquing the thumbscrews to no more than 18 lb-in.
(203 N•cm).
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DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
SUBTASK 25-62-03-410-002
C. Installation Documentation
(1) Make appropriate logbook (i.e., aircraft records) entries and submit FAA Form 337, along with
any supporting data required by the FAA for approval of the installation, as applicable.
NOTE
: Refer to TASK 25-62-03-410-801 on page 54 for additional information on installation
approvals.
(2) In countries other than the United States, make appropriate aircraft records entries and
submit documentation as required for installation approval in accordance with national
regulatory authorities.
B406-4 (453-5004)
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NOTE: Plug is
recessed in
ELT Assembly
RTV puddle
ELT ASSEMBLY
BATTERY PACK
SCREW WITH O-RING
P/N 217-0606
(4 PLCS)
RUBBER
SEAL
CONNECT
CONNECT
DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
TASK 25-62-03-450-806
8. Battery Pack Installation
SUBTASK 25-62-03-450-001
A. Battery Reinstallation
B406-4 (453-5004)
CAUTION
: THE BATTERY PACK CONTAINS ELECTROSTATIC DISCHARGE SENSITIVE (ESD)
COMPONENTS AND IT MUST BE HANDLED WITH CARE. IF POSSIBLE, WEAR A
GROUNDED WRIST STRAP WHEN HANDLING THE BATTERY PACK DURING
INSTALLATION ACTIVITIES. TAKE PARTICULAR CARE TO AVOID TOUCHING THE
EXPOSED CIRCUIT BOARD AND CONNECTOR PINS ON THE BOARD.
(1) This subtask applies to reinstallation of an existing battery that was removed for inspection
and testing.
(2) See Figure 22. Battery Pack Installation.
(3) Apply a thin coating of non-petroleum based silicone grease, such as GE G-635, to the rubber
(4) Lay the battery pack and ELT on their sides, such that the two components are aligned, but
(5) Connect the ELT lead 8-pin connector to the header on the battery pack circuit board.
(6) Connect the power harness 2-pin connector to the recessed connector inside the ELT body.
Figure 22. Battery Pack Installation
seal to facilitate installation and allow the ELT and battery pack to slide together without
binding on the rubber seal.
separated enough to allow the electrical connections to be made.
Page 74 of 87
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SWITCH/CONNECTOR
END
1
2
3
4
DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
B406-4 (453-5004)
(7) Reset the ELT by toggling the ELT local control switch to “ON” and back to “OFF” after 1-2
seconds.
NOTE
: This step is necessary because the ELT will occasionally activate when power is
connected to it in Step 6.
(8) Fit the battery pack into place on the ELT, while dressing the wires away from the standoffs to
avoid pinching the wires between the standoffs and battery pack.
(9) Turn the battery pack bottom face up to facilitate installing the screws, while securely holding
the ELT and battery pack together.
(10) Install the four battery pack retaining screws about half way (i.e., leave them loose).
(11) Tighten and torque the screws as shown in Figure 23. Battery Pack Retaining Screw
Tightening Pattern. Torque to 6-8 lb-in (68-90 N•cm).
Figure 23. Battery Pack Retaining Screw Tightening Pattern
(12) Perform an ELT self-test as follows:
(a) Set the ELT local control switch in the “ON” position. The LED will begin flashing every 3-
4 seconds.
(b) Return the switch to the “OFF” position after 1-2 seconds. If the ELT is working properly,
the LED will stay on for approximately 1 second and then flash the following expected
error codes, which should be ignored.
1
1-flash and 3-flash errors, which are generated because the ELT is not installed
and connected to an antenna, etc.
2
A 5-flash error will be indicated if the ELT is programed with a location protocol,
and is generated because the ELT is not connected to the navigation system and
receiving position data.
(c) If a 7-flash error code is indicated, there is a problem with the battery or battery
connection wiring. Refer to Table 6 on page 48.
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DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
SUBTASK 25-62-03-450-002
B. New Battery Installation
B406-4 (453-5004)
CAUTION
(1) This subtask applies to installation of a new (i.e., replacement) battery.
(2) Verify the bottom of the ELT is clean and free of battery corrosion residue. Clean as
(3) Remove the paper backing from the rubber seal at the connector end of the battery pack.
(4) Perform the procedure outlined in SUBTASK 25-62-03-450-001 on page 74.
(5) Place a new battery expiration date label on the ELT mounting frame cap or other visible
(6) Enter the pertinent battery replacement information in the logbook (i.e., aircraft records) and
: DO NOT USE CONTACT CLEANER ON ELT COMPONENTS. SUCH CHEMICAL AGENTS
CAN BE HIGHLY DESTRUCTIVE TO THE MOUNTING HARDWARE AND ELT HOUSING,
CAUSING CRACKING, FRACTURING AND OTHER DAMAGE.
necessary.
location.
NOTE
: The new label is supplied with the new battery pack.
fill out any other required documentation.
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DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
APPENDIX A – ELT REGISTRATION
TASK 25-62-03-990-801
1. Background Information
SUBTASK 25-62-03-990-001
A. Hex ID Code
(1) Each 406 MHz ELT is programmed with a unique hex ID code (i.e., registration code) that is
transmitted to the SAR satellite system. At a minimum, this code provides information
regarding:
(a) Unique aircraft or ELT identification,
(b) Country of origin, and
(c) Latitude and longitude position data, if equipped with a navigation interface device.
B406-4 (453-5004)
SUBTASK 25-62-03-990-002
B. Reason for Registration
(1) ELT registration aids the Rescue Coordination Center (RCC) in determining if an actual
emergency exists by accessing a database containing the registration information, which
facilitates inquiries as to the whereabouts of the aircraft, existence of a flight plan, etc.
(a) Owner’s name,
(b) Address,
(c) Telephone number,
(d) Aircraft type, and registration number.
SUBTASK 25-62-03-990-003
C. Registration Information Resources
(1) Refer to COSPAS-SARSAT documents G.005 and S.007 for information regarding ELT
programming and registration. These documents are available at www.cospas-sarsat.org.
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DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
TASK 25-62-03-990-802
2. Registration
SUBTASK 25-62-03-990-001
A. Responsibility
(1) It is the responsibility of the aircraft owner to register the ELT.
(a) If an ELT is moved to a different aircraft (i.e., an aircraft other than the one it was
originally installed on), and/or the aircraft is registered in a new country, the ELT must
be re-registered.
(b) If the aircraft is registered in a new country, the ELT must be re-registered.
(c) The product label must re-marked with the new HEX ID code to indicate new
programming, if applicable.
SUBTASK 25-62-03-990-002
B406-4 (453-5004)
B. Required Information
(1) The following information is required when registering an ELT:
(a) The unique Hex ID code printed on the ELT product label,
(b) The information listed in SUBTASK 25-62-03-990-002 on page 77.
(2) The information (i.e., address, telephone number, etc.), filed as part of the registration
process, should be kept up to date.
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DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
SUBTASK 25-62-03-990-003
C. Where to Register
(1) In the United States, the National Oceanic and Atmospheric Administration (NOAA) is the
registration agency.
(2) Specific registration web sites and information may be found at:
(a) The Artex products web site at www.acrartexcom, which has links to on-line registration
sites and also a link to registration forms and instructions for a number of countries.
(b) An ELT may also be registered in the United States by going directly to the NOAA ELT
registration web site at www.beaconregistration.noaa.gov.
NOTE
: NOAA may also be contacted by mail at:
US MAIL ONLY FEDEX OR UPS ONLY
SARSAT Beacon Registration SARSAT Beacon Registration
B406-4 (453-5004)
NSOF, E/SPO53 NSOF, E/SPO53
1315 East West Highway 4231 Suitland Road
Silver Spring, MD 20910-9684 Suitland, MD 20746-4304
or by phone at 1-888-212-7283 or 301-817-4565.
(3) In other countries, the national civil aviation authority in the applicable country should be
contacted to obtain registration information.
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DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
TASK 25-62-03-990-801
1. Introduction
SUBTASK 25-62-03-990-001
A. Purpose
(1) This illustrated parts list (IPL) illustrates and lists the spare parts, with attaching hardware,
applicable to the B406-4 ELT.
(2) Parts and components not listed herein, are not field replaceable and ELT repairs requiring
parts outside the scope of this manual must be accomplished by the manufacturer.
SUBTASK 25-62-03-990-002
B. IPL Usage Guide
B406-4 (453-5004)
ILLUSTRATED PARTS LIST
(1) If the part number is not known:
(a) Find the part in the IPL Figure illustration.
(b) Note the item number assigned to the part.
(c) Refer to the associated parts list and find the item number in the “Fig # & Item” column.
(2) If the part number is known:
(a) Refer to the parts list and find the part in the “Part #” column.
(b) Note the figure number and item number assigned to the part.
(c) Refer to the illustration in the applicable IPL figure to find attaching hardware and
related assembly parts.
(3) In cases where multiple item numbers are shown on an illustration for the same item, there is
more than one part number option associated with that item.
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DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
TASK 25-62-03-990-802
2. Manufacturer Name and Address
SUBTASK 25-62-03-990-001
A. Ordering Information
(1) Approved parts may be ordered from ACR Electronics, or any authorized dealer.
CONTACT INFORMATION
Sales, ACR Electronics, Inc / Artex Products
Fort Lauderdale, FL 33312-6645, USA
Phone: (954) 981-3333
B406-4 (453-5004)
5757 Ravenswood Rd
Fax: (954) 983-5087
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DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
B406-4 (453-5004)
TASK 25-62-03-990-803
3. Explanation of Detailed Parts List Entries
SUBTASK 25-62-03-990-001
A. Fig # & Item Column
(1) The first number at the top of the column is the figure number of the corresponding
illustration.
(2) The right hand number is the item number in the associated figure.
(3) A dash (–) in front of an item means the part is not illustrated.
(4) Alpha-variants A through Z (except I and O) are assigned to item numbers, when necessary to
identify added parts, alternate parts, and service bulletin modified parts.
SUBTASK 25-62-03-990-002
B. Part # Column
(1) This column contains the manufacturer’s part number for each part.
SUBTASK 25-62-03-990-003
C. Nomenclature Column
(1) This column contains descriptive nomenclature for each part, service bulletin numbers
affecting the part, and obsolete part numbers.
(2) The indenture system used in the “Nomenclature” column indicates the relationship of one
part to another, as follows:
1 2 3
End Item or Major Assembly
ATTACHING PARTS
Attaching Parts for End Item or Major Assembly
***
. Detail Parts for End Item or Major Assembly
. Subassemblies
ATTACHING PARTS
. Attaching Parts for Subassemblies
***
. . Detail Parts for Subassemblies
ATTACHING PARTS
. . Attaching Parts for Detail Parts
***
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DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
B406-4 (453-5004)
(3) Assemblies, subassemblies, and detail parts subject to modification, deletion, addition, or
replacement by an issued service bulletin, are annotated to indicate both pre- and postservice bulletin configurations. The term (PRE SB XXXX) in the “Nomenclature” column
designates the original configuration, and the term (POST SB XXXX) identifies assemblies and
parts after the modification has been completed.
(4) The terms defined below are used when applicable to indicate the interchangeability of parts.
TERM ABBREVIATION DEFINITION
The listed part is alternate to, and interchangeable
Alternate ALT
with, other parts within the same item number
variant group or other item numbers if
designated.
Superceded By SUPSD BY
Supersedes SUPSDS
Replaced By REPLD BY
Replaces REPLS
SUBTASK 25-62-03-990-004
D. UPA (Units Per Assembly) Column
(1) The quantity shown in this column represents the units required for one next higher assembly
or, when referring to attaching parts, the quantity to attach one such item.
(2) The abbreviation RF (reference) indicates the end item assembly is listed for reference
purposes.
The part is replaced by and is not interchangeable
with the item number designated in the notation.
The part replaces and is not interchangeable with
the item number designated in the notation.
The part is replaced by and is interchangeable
with the item number designated in the notation.
The part replaces and is interchangeable with the
item number designated in the notation.
25-62-03
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DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
04
02
01
03
05
TASK 25-62-03-990-804
4. Detailed Parts List
Figure 24. B406-4 ELT Main Assembly and Installation
ACR ELECTRONICS, INC / ARTEX PRODUCTS
B406-4 (453-5004)
FIG # ITEM PART # 1234 NOMENCLATURE UPA
24 01 452-3052 Protective Top Cover Assembly 1
02 452-5052 Mounting Frame Cap Assembly 1
03 452-5050 Mounting Tray Assembly 1
– 201-0810 Screw, PHP 8-32 x 5/8” SS 4
– 246-0008 Washer, Flat 1/2” SS #8 4
– 247-0800 Washer, Lock Internal Tooth SS #8 4
– 241-0832 Nut, 8-32 x 1/4” Hex SS 4
04 453-5004 B406-4 Main Assembly 1
– 591-0999 . Label, Hex Code 1
ATTACHING PARTS
***
***
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DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
B406-4 (453-5004)
FIG # ITEM PART # 1234 NOMENCLATURE UPA
– 591-0429 . Label, Country Code 1
***
05 452-0133 . 406 Lithium Battery Pack 1
ATTACHING PARTS
– 217-0606 . Screw, with O-Ring 4
***
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WIRING HARNESS
(Ref. Only)
02
03
01
MS24266R16B2457
(Ref. Only)
DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
B406-4 (453-5004)
Figure 25. Electrical Components
FIG # ITEM PART # 1234 NOMENCLATURE UPA
25 01 453-0161 Control Panel G737 1
***
– 591-0428 . Label, ELT Cautionary Use Advisory (Optional) 1
***
02 151-5012 Receptacle, 12-Pin 1
***
– 151-6627 . Terminal, Crimp Male 0.062 Dia. 12
***
03 130-4005 Horn Mod ELT Buzzer 1
***
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DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
B406-4 (453-5004)
Figure 26. Antennas
01
03
04
02
05
FIG # ITEM PART # 1234 NOMENCLATURE UPA
26 01 110-337 Antenna, 406 Blade (319 Dual Input) 1
02 110-328-01 Antenna, 406 Blade (Dual Input) 1
03 110-333 Antenna, Tri-Band Blade, White (Dual Input) 1
04 110-320 Antenna, Tri-Band Rod (Dual Input) 1
05 110-337-11 Antenna, 406 Blade w/prot edge 1
***
– 611-6013-04 . Cable, Coax BNC to BNC (6 ft.) 1
– 611-6052 . Cable Coax TNC to TPS (6 ft.) 1
***
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