Garmin GRA 5500, GRA 55 User manual

System Maintenance Manual

GRA 55/5500 Bell 206 STC

Contains Instructions for Continued Airworthiness

for Bell 206 STC

190-01277-A3 July 2014 Revision 1

System Maintenance Manual

GRA 55/5500 Bell 206 STC

as installed in

Bell 206B, 206L Series

Reg. No. S/N

Contains Instructions for Continued Airworthiness

for Bell 206 STC

Dwg. Number:

190-01277-A3 Rev. 1

Garmin International, Inc.

1200 E. 151st Street

Olathe, Kansas 66062 USA

190-01277-A3 System Maintenance Manual GRA 55/5500 Bell 206 STC
Rev. 1 Page A

© 2014 Garmin International, Inc. or its subsidiaries

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190-01277-A3 System Maintenance Manual GRA 55/5500 Bell 206 STC
Rev. 1 Page B

RECORD OF REVISIONS

Revision Revision Date Description

1 07/11/2014 Initial Release

CURRENT REVISION DESCRIPTION

Revision

1 All All Initial Release

Section

Number(s)

Page

Number(s)

DOCUMENT PAGINATION

Section Pagination

Table of Contents ii through v

Section 1 1-1 through 1-2
Section 2 2-1 through 2-1
Section 3 3-1 through 3-8
Section 4 4-1 through 4-6
Section 5 5-1 through 5-7
Section 6 6-1 through 6-3
Section 7 7-1 through 7-1
Section 8 8-1 through 8-2
Section 9 9-1 through 9-1

Description of Change

Appendix A A-1 through A-7

190-01277-A3 System Maintenance Manual GRA 55/5500 Bell 206 STC
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INFORMATION SUBJECT TO EXPORT CONTROL LAWS

WARNING

CAUTION

NOTE

This document may contain information which is subject to the Export Administration Regulations
(“EAR”) issued by the United States Department of Commerce (15 Code of Federal Regulations (CFR),
Chapter VII, Subchapter C) and which may not be exported, released, or disclosed to foreign nationals
inside or outside of the United States without first obtaining an export license. A violation of the EAR may
be subject to a penalty of up to 10 years imprisonment and a fine of up to $1,000,000 under Section 2410
of the Export Administration Act of 1979. Include this notice with any reproduced portion of this
document.

This information in this document is subject to change without notice. Visit the Garmin web site
(

www.garmin.com) for current updates and supplemental information concerning the operation of

Garmin products.

DEFINITIONS OF WARNINGS, CAUTIONS, AND NOTES

Warnings are used to bring to the installer’s immediate attention that not only
damage to the equipment but personal injury may occur if the instruction is
disregarded.

Cautions are used to alert the individual that damage to equipment may result
if the procedural step is not followed to the letter.

Notes are used to expand and explain the preceding step and provide further
understanding of the reason for the particular operation.

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TABLE OF CONTENTS

1 INTRODUCTION .............................................................................................................................1-1

1.1 Purpose ......................................................................................................................................1-1

1.2 Scope .........................................................................................................................................1-1

1.3 Document Control ...................................................... ..................................................... ..........1-1

1.4 Permission to Use Certain Documents ......................................................................................1-1

1.5 Definitions .................................................................................................................................1-1

1.6 Terminology ..............................................................................................................................1-2

1.7 Publications ...............................................................................................................................1-2

1.7.1 Applicability ........................................................................................................... 1-2

1.7.2 Definition of Abbreviations ................................................................................... 1-2

1.7.3 Precautions .............................................................................................................1-2

1.7.4 Units of measurement ............................................................................................ 1-2

1.7.5 Referenced publications (or their later revisions) ..................................................1-2

1.7.6 Retention ................................................................................................................ 1-2

2 SYSTEM DESCRIPTION ................................................................................................................2-1

2.1 Description of Alteration ...........................................................................................................2-1

2.2 Block Diagram ..........................................................................................................................2-1

3 GRA 55/5500 CONTROL AND OPERATION .............................................. ..... .... .......................3-1

3.1 Control, Operating, and Testing Information ............................................................................3-1

3.2 Downloading and Installing the GRA 55/5500 Retrofit Installation Tool ................................3-1

3.3 Using the GRA 55/5500 Retrofit Installation Tool ...................................................................3-2

3.4 Installation Tool Pages ..............................................................................................................3-2

3.4.1 Status Page ............................................................................................................. 3-3

3.4.2 Configuration Page ................................................................................................ 3-4

3.4.3 Software Page ........................................................................................................ 3-5

3.4.4 Diagnostics Page .................................................................................................... 3-6

3.4.5 Utilities Page ..........................................................................................................3-7

3.4.6 Zero-Foot Calibration ............................................................................................ 3-8

4 INSTRUCTIONS FOR CONTINUED AIRWORTHINESS ........................................................4-1

4.1 Servicing Information ............................................................. ..... .............................................4-1

4.2 Periodic Maintenance ................................................................................................................4-1

4.3 Special Tools .............................................................................................................................4-1

4.4 Maintenance Intervals ................ ........................................................... .... ..... ...........................4-2

5 TROUBLESHOOTING INFORMATION .....................................................................................5-1

5.1 GRA 55/5500 General Troubleshooting ...................................................................................5-1

6 REMOVAL AND REPLACEMENT INFORMATION ...............................................................6-1

6.1 Unit Installation .........................................................................................................................6-1

6.1.1 Installation Procedure ............................................................................................ 6-1

6.1.2 Removal Procedure ................................................................................................ 6-1

6.2 Rack Installation ........................................................................................................................6-1

6.2.1 Installation Procedure ............................................................................................ 6-1

6.2.2 Removal Procedure ................................................................................................ 6-1

6.3 Antenna Installation ..................................................................................................................6-1

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TABLE OF CONTENT CONTINUED

6.3.1 Installation Procedure ............................................................................................ 6-1

6.3.2 Removal Procedure ................................................................................................ 6-2

7 RETURN TO SERVICE PROCEDURE ........................................................................................7-1

7.1 Return to Service .......................................................................................................................7-1

7.2 Maintenance Records ................................................................................................................7-1

8 LIMITATIONS AND ADDITIONAL REQUIREMENTS ...........................................................8-1

8.1 Diagrams ...................................................................................................................................8-1

8.2 Special Inspection Requirements ..............................................................................................8-1

8.3 Application of Protective Treatments .......................................................................................8-1

8.4 Data Relative to Structural Fasteners ........................................................................................8-1

8.5 Additional Instructions ..............................................................................................................8-1

8.6 Overhaul Period .........................................................................................................................8-1

8.7 ICA Revision and Distribution ..................................................................................................8-1

8.8 Assistance ..................................................................................................................................8-1

8.9 Implementation and Record Keeping ........................................................................................8-2

9 AIRWORTHINESS LIMITATIONS SECTION ..........................................................................9-1

APPENDIX A AIRCRAFT SPECIFIC INFORMATION .............................................. A-1

A.1 Weight and Balance ................................................................................................................. A-5

190-01277-A3 System Maintenance Manual GRA 55/5500 Bell 206 STC
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LIST OF FIGURES

Figure 2-1. GRA 55/5500 Block Diagram ............................................................................ 2-1

Figure 3-1. Installation Tool Page Tabs ................................................................................ 3-2

Figure 3-2. Status Page .......................................................................................................... 3-3

Figure 3-3. Configuration Page .............................................................................................3-4

Figure 3-4. Software Page .....................................................................................................3-5

Figure 3-5. Diagnostics Page ................................................................................................. 3-6

Figure 3-6. Utilities Page ....................................................................................................... 3-7

Figure 6-1. GRA 55/5500 Installation ................................................................................... 6-2

Figure 6-2. Rack Installation .................................................................................................6-3

Figure 6-3. GRA 55/5500 Antenna Installation .................................................................... 6-3

Figure A-1. GRA STC Equipment Fuselage Station Location for Bell 206 ......................... A-1

Figure A-2. GRA STC Equipment Fuselage Station Location for Bell 206L Series ............ A-1

Figure A-3. GRA 55/5500 Unit and Rack Installation in the Bell 206B, 206L Series ......... A-2

Figure A-4. Overhead Circuit Breaker Panel in Bell 206B, 206L Series ............................. A-3

Figure A-5. GRA 55/5500 Wire Routing in the Bell 206B, 206L Series ............................. A-4

Figure A-6. GRA 55/5500 Unit Location and Moment Arm in Bell 206B, 206L Series ..... A-5

Figure A-7. Bell 206B LRU and Antenna Locations ............................................................ A-6

Figure A-8. Bell 206L Series LRU and Antenna Locations ................................................. A-7

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LIST OF TABLES

Table 4-1. Maintenance Intervals for GRA 55/5500 ...........................................................4-2

Table 4-2. Maintenance Intervals for Antennas Replaced Under this STC ......................... 4-4

Table 5-1. GRA 5500 Fault Descriptions ............................................................................ 5-1

Table A-1. Bill of Materials ................................................................................................. A-2

Table A-2. Circuit Breaker Placard ..................................................................................... A-3

Table A-3. Weight and Balance Details .............................................................................. A-5

190-01277-A3 System Maintenance Manual GRA 55/5500 Bell 206 STC
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1 INTRODUCTION

1.1 Purpose

This document provides Instructions for Continued Airworthiness in compliance with requirements of 14
CFR §27.1529, and Part 27 Appendix A. This ICA is to be used by the agency installing the Garmin GRA
55/5500 radar altimeter system under the GRA 55/5500 STC. This document includes information
required by the operator to adequately maintain the Garmin GRA55/5500 system as installed by this STC.

1.2 Scope

This document provides Instructions for Continued Airworthiness for the Bell 206B, 206L, L-1, L-3, and
L-4 rotorcraft, modified by the installation of the Garmin GRA 55/5500 STC.

1.3 Document Control

This document is released, archived, and controlled in accordance with the Garmin document control
system.

1.4 Permission to Use Certain Documents

Permission is granted to any corporation or person to use GRA 55/5500 STC documents to accomplish the
Instructions for Continued Airworthiness and show compliance with STC engineering data when applying
for approval. This permission does not construe suitability of the documents. It is the responsibility of the
applicant to determine the suitability of the documents for the ICA.

1.5 Definitions

The following terminology is used within this document:

1. ACO:Aircraft Certification Office

2. AEG:Aircraft Evaluation Group

3. AGL:Above Ground Level

4. BIT:Built-In Test

5. CFR:Code of Federal Regulations

6. FAA:Federal Aviation Administration

7. FMCW: Frequency Modulated Continuous Wave

8. FOD:Foreign Object Damage

9. ICA:Instructions for Continued Airworthiness

10. LRU:Line Replaceable Unit

11. NAV:Navigation

12. ODA:Organization Designation Authorization

13. PMI:Principal Maintenance Inspector

14. POI:Principal Operations Inspector

15. RX:Receive

16. STC:Supplemental Type Certificate

17. TSO: Technical Standard Order

18. TX:Transmit

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1.6 Terminology

Except where specifically noted, references made to the ‘GRA’ will equally apply to the GRA 55 and GRA
5500 radar altimeters.

Also, except where specifically noted, references made to the ‘Bell 206L Series’ will apply equally to the
Bell 206L, Bell 206L-1, Bell 206L-3, and Bell 206L-4 models.

1.7 Publications

Content, Scope, Purpose and Arrangement:This document identifies the Instructions for Continued
Airworthiness for the modification of the aircraft by the installation of the Garmin GRA 55/5500 Part 27
STC.

1.7.1 Applicability

Applies to aircraft altered by the installation of the Garmin GRA 55/5500 Part 27 STC.

1.7.2 Definition of Abbreviations

See Section 1.5 and Section 1.6.

1.7.3 Precautions

None.

1.7.4 Units of measurement

None.

1.7.5 Referenced publications (or their later revisions)

1. Bell Model 206B Maintenance Manual, Bell Document BHT-206B-MM, Revision 12, 1 June
2012

2. Bell Model 206L Maintenance Manual, Bell Document BHT-206L-MM, Revision 36, 1 June 2012

3. Bell Model 206L1 Maintenance Manual, Bell Document BHT-206L1-MM, Revision 33, 1 June
2012

4. Bell Model 206L3 Maintenance Manual, Bell Document BHT-206L3-MM, Revision 19, 1 June
2012

5. Bell Model 206L4 Maintenance Manual, Bell Document BHT-206L4-MM, Revision 16, 1 June
2012

6. Structural Repair Manual for Bell Model 206 Series Helicopters, BHT-206-SRM-1, Revision 1,
April 1995

7. Electrical Standard Practices Manual for all Bell Helicopter Commercial Products, BHT-ELEC­SPM, Revision 2, July 2012

1.7.6 Retention

This document, or the information contained within, will be included in the aircraft’s permanent records.

190-01277-A3 System Maintenance Manual GRA 55/5500 Bell 206 STC
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2 SYSTEM DESCRIPTION

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2.1 Description of Alteration

This STC upgrades the existing functionality of the Bell 206B, 206L series aircraft avionics system as
summarized below.

The GRA 55/5500 radar altimeter system features: two antenna architecture for transmitting and receiving
radio waves for altitude quantities, remote mounted LRU transceiver for quantifying Above Ground Level
(AGL) altitude information, and interface capabilities to the existing aircraft G500H Flight Deck System
(FDS) for pilot display of aircraft altitude and system degraded warnings. The GRA 55/5500 radar
altimeter may also integrate with an installed Garmin GTN 6XX/7XX for the purpose of providing the
optional 50 ft callout as part of optional HTAWS functionality.

The GRA 55/5500 LRU which is 3.99"x3.02"x11.62" mounted, is located on the supplied mounting rack
that is electrically bonded to the avionics shelf. The two approved radar altimeter antennas are optimally
located on the underside of the tailboom, separated by a minimum distance of 20" on center using
approved antenna mounts installed via STC SR09598RC, STC SR02162LA or other mounting provisions
that are compatible with the approved radar altimeter antennas. The system requires a 5 Amp minimum
circuit breaker installed on the overhead panel to supply power.

2.2 Block Diagram

Figure 2-1. GRA 55/5500 Block Diagram

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3 GRA 55/5500 CONTROL AND OPERATION

NOTE

3.1 Control, Operating, and Testing Information

The GRA 55/5500 is a fully automated, remote-mounted LRU which requires no user controls or inputs.
The GRA 55/5500 displays the radar altitude height above ground level on compatible display systems.
Radar altitudes will be displayed ranging from ground level to 2550ft AGL.

The GRA 55/5500 has a built-in self-test (BIST/BITE) and fault logging functionality which includes
automated self-test and fault detection monitoring of the entire internal TX and RX circuitry. This feature
occurs every time the unit power is cycled and subsequently every minute during normal operation at
calculated altitudes ranging from 250ft to 2550ft AGL and during “No Computed Data” (NCD) conditions.

The GRA 55/5500 will encounter NCD conditions; at actual altitudes above 2550ft AGL, during excess
pitch or roll maneuvering, or anytime the ground reflection is poor.

3.2 Downloading and Installing the GRA 55/5500 Retrofit Installation Tool

GRA 55/5500 configuration, calibration, diagnostics, and software upgrades are performed using a
personal computer (installed with Microsoft Windows XP Service Pack 3 or later) and the GRA 55/5500
Retrofit Installation Tool, Garmin part number 006-A0451-00. The tool is available for download from the
Dealer Resource Center portion of the Garmin website (www.garmin.com). See the accompanying
“readme” file in the tool’s installation directory for the latest instructions.

A standard USB-A plug to USB-B plug commercial cable (not provided) is required to
interface between a personal computer USB-A receptacle and the GRA 55/5500 USB-B
receptacle installed in the wiring harness. This dongle cable is required to use the GRA
55/5500 Retrofit Installation Tool.

Installation

1. Once downloaded, launch the installation file from the directory in which it is stored (or use the
web browser’s download shortcuts).

2. The GRA 55/5500 Retrofit Installation Tool Setup Wizard will begin.

3. Click “Next” as prompted by the setup wizard, and adjust any settings (e.g. installation directory)
as needed.

4. The last screen of the setup wizard will show “Installation Complete.” Click the “Close” button to
close the setup wizard.

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3.3 Using the GRA 55/5500 Retrofit Installation T ool

Once the GRA 55/5500 Retrofit Installation Tool has been installed:

1. Connect the PC to the GRA 55/5500

2. Start the GRA 55/5500 Retrofit Installation Tool from the provided “Start Menu” shortcut, or
launch the application from its program folder

3. Power-up the GRA 55/5500 by applying aircraft power

4. The connection status in the lower, right-hand corner of the GRA 55/5500 Retrofit Installation
Tool will transition from “Not Connected,” to “Connected.”

5. If the GRA 55/5500 Retrofit Installation Tool does not display “Connected” in the lower, right­hand corner, check the installation and make sure the GRA 55/5500 has been powered-up and that
the USB cable is properly connected to the PC.

If the PC displays a “Found New Hardware” wizard, the GRA 55/5500 Retrofit Installation Tool was not
able to automatically install the device driver. It may be necessary to manually install the device drivers.
Copies of the drivers’ “.inf” and “.dll” files are located in the target installation directory selected during
installation. Consult the PC’s operating system documentation on manually installing drivers.

3.4 Installation Tool Pages

The Installation Tool contains five tabbed pages, all of which can be useful in troubleshooting a problem.
The pages are: Status, Configuration, Software, Diagnostics, and Utilities (See Figure 3-1).

Figure 3-1. Installation Tool Page Tabs

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3.4.1 Status Page

The status page (Figure 3-2) is displayed by selecting the Status tab. This page provides the basic fault
status of the unit. During normal operation, the status of each fault should indicate “normal.” If the unit
indicates a fault, the fault’s entry on the list is displayed in a bold, red font. The status also updates to show
the specific failure under that fault. Table 5-1 identifies the various unit faults that can be encountered
during normal operation of the GRA 55/5500. Use Table 5-1 as a reference to determine the proper actions
to take after a fault has been identified.

Figure 3-2. Status Page

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