DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
C406-2 (453-5000), C406-2HM (453-5001)
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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RECORD OF REVISIONS
REV NO.DCN NO.DCN DATEREV NO.DCN NO.DCN DATE
-RELEASEJun 30/1999
-ECO 1493Sep 07/2000
-ECO 1523Oct 18/2000
ADCN 1641Apr 11/2001
ADCN 1760Aug 01/2001
ADCN 1965Apr 04/2002
ADCN 2115Dec 10/2002
ADCN 2356Feb 11/2004
ADCN 2527Jan 20/2005
ADCN 2689Jan 09/2006
ADCN 2888Nov 26/2006
BDCN 2968Mar 20/2007
BDCN 3174Feb 26/2008
BDCN 3282Aug 25/2008
CDCA W9414Apr 06/2010
DECO 14756Jul 27/2011
EECO 15149Jul 31/2012
FECO 15177Aug 28/2012
GECO 15410Jun 20/2013
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SERVICE BULLETIN LIST
SERVICE
BULLETIN NO
ISSUE
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SUBJECT
MANUAL
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LIST OF EFFECTIVE PAGES
SUBJECTPAGEDATESUBJECTPAGEDATE
Title Page1Aug 28/12Description and Operation30Aug 28/12
Notices2Aug 28/12(cont.)31Aug 28/12
Record of Revisions3Aug 28/1232Aug 28/12
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Service Bulletin List5Aug 28/1234Aug 28/12
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List of Effective Pages7Aug 28/12Test and Fault Isolation36Aug 28/12
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Table of Contents9Aug 28/1238Aug 28/12
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List of Figures13Aug 28/1242Aug 28/12
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Introduction15Aug 28/1244Aug 28/12
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22Aug 28/12Removal51Aug 28/12
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25Aug 28/12Installation54Aug 28/12
Description and Operation26Aug 28/1255Aug 28/12
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SUBJECTPAGEDATESUBJECTPAGEDATE
Installation59Jun 20/201381Aug 28/12
(cont.)60Aug 28/1282Aug 28/12
61Aug 28/1283Aug 28/12
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Appendix A78Aug 28/12
79Aug 28/12
Illustrated Parts List80Aug 28/12
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1.Manual Usage
SUBTASK 25-62-11-990-001
A.General
(1)This manual describes the operation, installation, and maintenance of the Model C406-2
Series emergency locator transmitter (ELT). This 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.acrartex.com 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 78.
C406-2 (453-5000), C406-2HM (453-5001)
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 switches, 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.
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B.Application
(1)This manual constitutes supporting data/documentation for the C406-2 Series 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 C406-2 Series 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 C406-2 Series 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.
C406-2 (453-5000), C406-2HM (453-5001)
(4)C406-2 Series 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 and antennas) addressed in this manual are the
accessories most commonly associated with the C406-2 Series ELT. Other options, such as a
different remote switch configuration or an ELT/NAV Interface, 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 a C406-2
Series 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 C406-2
Series ELT.
TASK 25-62-11-990-802
2.Model Descriptions
SUBTASK 25-62-11-990-001
A.C406-2
(1)The C406-2 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,
protective top cover and mounting frame cap.
(3)When ordered as a system, an installation kit, cockpit remote switch, coax cables, audible
buzzer, and dual input antenna are provided.
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+Y
-Y
-X
+X
+Z
-Z
FWD
DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
SUBTASK 25-62-11-990-002
B.C406-2HM
(1)The C406-2HM ELT was developed for helicopter installations and features an additional 5-
axis G-Switch module, which allows the ELT to be activated in any of six axes. See Figure 1.
(2)The C406-2HM ELT is identical to the C406-2 ELT in all other aspects.
C406-2 (453-5000), C406-2HM (453-5001)
TASK 25-62-11-990-803
3.Approvals
SUBTASK 25-62-11-990-001
A.C406-2 and C406-2HM
(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
(4)JTSO-2C126
(5)COSPAS-SARSAT - Certificate No. 112 or 170
Figure 1 ELT Orthogonal Axes
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B.Battery
C406-2 (453-5000), C406-2HM (453-5001)
CAUTION
(1)The lithium battery pack used on the C406-2 Series ELT is certified under TSO C142.
(2)The DO-160D environmental categories breakdown is detailed in Table 1 on page 19.
:LITHIUM BATTERY SAFETY CONCERNS INCLUDE THE POSSIBILITY OF FIRE, VENTING
VIOLENTLY, AND VENTING OF TOXIC GASES.
(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.
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Table 1 Environmental Categories Breakdown
CATEGORYSECTIONDESCRIPTION
C14.0Temperature/Altitude
-4.5.4In-Flight Loss of Cooling
B5.0Temperature Variation
A6.0Humidity
2047.0/8.0Operational Shock and Crash Safety/Vibration
X9.0Explosion
R10.0Waterproofness
X11.0Fluids Susceptibility
X12.0Sand and Dust
X13.0Fungus
X14.0Salt Spray
X15.0Magnetic Effect
Z16.0Power Input
A17.0Voltage Spike
Z18.0Audio Frequency Susceptibility
Z19.0Induced Signal Susceptibility
20420.0Radio Frequency Susceptibility
B21.0Emission of RF Energy
X22.0Lightning
X23.0Lightning Direct Effects
X24.0Icing
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4.Frequency Allocations
SUBTASK 25-62-11-990-001
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 25-62-11-990-002
B.Discussion
(1)The 406 MHz transmitter frequency of the C406-2 Series 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 C406-2 Series ELTs covered by this manual transmit on 406.025 MHz,
current C406-2 Series 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.
C406-2 (453-5000), C406-2HM (453-5001)
(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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TASK 25-62-11-990-805
5.List of Acronyms, Abbreviations, and Definitions
SUBTASK 25-62-11-990-001
Term
ACAdvisory Circular – A Federal Aviation Administration (USA) bulletin
AWGAmerican Wire Gauge – An electrical wire diameter standard. Look for
BNC CONNECTORA very common type of coax cable connector having a 50 imped-
CARCanadian Aviation Regulations – The rules and regulations governing
CFRCode of Federal Regulations – The general and permanent rules pub-
CONTAINERThe 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-SARSATThe 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.
DERDesignated Engineering Representative – An individual qualified and
designated by the FAA to approve, or recommend approval, of technical data to the FAA.
DRIP LOOPExtra 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.
ELTEmergency 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.
EMIElectromagnetic Interference – An undesirable disturbance that
affects an electrical circuit due to either electromagnetic conduction
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or electromagnetic radiation emitted from an external source. Also
called radio frequency interference or RFI.
EUROCAEEuropean 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.
FAAFederal Aviation Administration – The United States government
agency for aircraft safety and regulation.
FARFederal Aviation Regulations – The rules and regulations governing
the manufacture, certification, operation, maintenance, repair, and
alteration of aircraft in the United States.
FORM 337FAA 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.
FSDOFlight Standards District Office – FAA district offices responsible for
aircraft certification, operation, maintenance, and modification issues,
approvals and enforcement.
G-SWITCHA velocity switch that detects sudden de-acceleration and is used to
automatically activate an ELT. May also be referred to as a “crash
sensor”.
LEDLight Emitting Diode – Semiconductor device that emits light when
current is passed through it. Usually used as a status or warning indicator.
MILThe 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/NPart Number – Refers to a ACR Electronics part number, unless other-
wise noted. Part numbers are also indicated with parentheses (e.g.,
XXX-XXXX).
PLUGThe term “Plug”, within the context of this document, refers to the
male half of an electrical connector.
RECEPTACLEThe term “Receptacle”, within the context of this document, refers to
the female half of an electrical connector.
RFRadio Frequency – The range of electromagnetic radiation that con-
stitutes the radio spectrum and corresponds to the frequency of alter-
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C406-2 (453-5000), C406-2HM (453-5001)
nating current electrical signals used to produce and detect radio
waves.
RTCARadio Technical Commission for Aeronautics – Organization that
makes recommendations for airworthiness. Refer to http://
www.rtca.org/aboutrtca.asp for more information.
RTVA rubbery silicon-based adhesive typically used to prevent vibration
problems and water intrusion.
SARSearch and Rescue
SCREEN ROOMThe 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 LOOPA 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.
TETHERA 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 CONNECTORA threaded version of a BNC connector.
TPS CONNECTORA small, rugged, three-pin bayonet locking connector designed for
use when space and weight limitations are of primary concern.
TSOTechnical 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.
UTCCoordinated 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.
VHFVery High Frequency – The 30 MHz to 300 MHz radio frequency band.
VSWRVoltage 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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TASK 25-62-11-990-806
6.References
SUBTASK 25-62-11-990-001
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”
C406-2 (453-5000), C406-2HM (453-5001)
(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”
(d)DO-183, “Minimal Operational Performance Standards for Emergency Locator
DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
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 25-62-11-990-002
B.Other Documents
(1)The following documents are available on-line at the Artex products web site at
www.acrartex.com, or from ACR Electronics upon request.
(a)570-1000, “ELT Test Set (ETS) Operation Manual”
(b)570-4602, “ELT/NAV Interface Description, Operation, Installation and Maintenance
Manual”
C406-2 (453-5000), C406-2HM (453-5001)
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1.Description
SUBTASK 25-62-11-870-001
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
C406-2 (453-5000), C406-2HM (453-5001)
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 (453-6500). Refer to the
ELT/NAV Interface Abbreviated Component Maintenance Manual (570-4602) for a
detailed discussion of the interaction between the ELT, ELT/NAV Interface, 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
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aircraft navigation system via the ELT/NAV Interface, 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.
(7)Aircraft communications transceivers are not capable of receiving 406 MHz transmissions;
therefore, the only methods of monitoring the ELT are:
(a)The blinking cockpit remote switch LED,
(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 25-62-11-870-002
B.Components
(1)The C406-2 Series 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
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