Garmin GTN 6 series User manual

190-01007-B1 October 2013 Revision 1
GTN 6XX/7XX
Part 27 AML STC Maintenance Manual

190-01007-B1 GTN 6XX/7XX Part 27 AML STC Maintenance Manual
Rev. 1 Page A
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Please send questions or comments about Garmin aviation products to A[email protected].
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Telephone: [phone]
Aviation Dealer Technical Support Line (Toll Free): 888-606-5482
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RECORD OF REVISIONS
Revision Revision Date Description
110/8/13 Initial Release

GTN 6XX/7XX Part 27 AML STC Maintenance Manual 190-01007-B1
Page B Rev. 1
INFORMATION SUBJECT TO EXPORT CONTROL LAWS
This document may contain information which is subject to the Export Administration Regulations
(“EAR”) issued by the United States Department of Commerce (15 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.
DEFINITIONS OF WARNINGS, CAUTIONS, AND NOTES
NOTE
All screen shots used in this document are current at the time of publication. Screen shots
are intended to provide visual reference only. All information depicted in screen shots,
including software file names, versions, and part numbers, is subject to change and may
not be up to date.
WARNING
A warning concerns an operating procedure or practice that, if not strictly observed, can
result in injury or loss of life.
CAUTION
A caution concerns an operating procedure or practice that, if not strictly observed, can
result in damage to or destruction of equipment.
NOTE
A note concerns an operating procedure, practice, or condition worthy of special
attention.

190-01007-B1 GTN 6XX/7XX Part 27 AML STC Maintenance Manual
Rev. 1 Page i
TABLE OF CONTENTS
1 INTRODUCTION ............................................................................................................... 1-1
1.1 Scope .............................................................................................................................................1-1
1.2 Unit Return ....................................................................................................................................1-1
1.3 Organization ..................................................................................................................................1-1
1.4 Abbreviations.................................................................................................................................1-2
1.5 Publications ...................................................................................................................................1-2
1.6 Distribution....................................................................................................................................1-3
2 SYSTEM DESCRIPTION .................................................................................................. 2-1
2.1 Equipment Descriptions ................................................................................................................2-1
2.1.1 GTN 6XX .............................................................................................................................................. 2-1
2.1.2 GTN 7XX .............................................................................................................................................. 2-1
2.1.3 GMA 35 Audio Panel............................................................................................................................ 2-1
2.1.4 NAV Antenna Cable Splitter................................................................................................................. 2-1
2.1.5 NAV Antenna Cable Diplexer............................................................................................................... 2-1
2.1.6 HTAWS Annunciator............................................................................................................................ 2-2
2.1.7 Cyclic Control Grip ............................................................................................................................... 2-2
2.2 GTN System Interfaces .................................................................................................................2-2
2.2.1 GTN Optional Interfaces ....................................................................................................................... 2-2
2.2.2 GTN 6XX/7XX Interfaces .................................................................................................................... 2-3
2.2.3 GMA 35 Equipment Interfaces ............................................................................................................. 2-5
3 GTN CONTROL AND OPERATION...............................................................................3-1
3.1 GTN Controls ................................................................................................................................3-1
3.2 Software Loading ..........................................................................................................................3-2
3.2.1 GTN Software Loader Card Creation.................................................................................................... 3-2
3.2.2 GMA 35 Software Loading................................................................................................................... 3-4
3.3 GTN Configuration Mode Overview ............................................................................................3-5
3.3.1 GTN Software Updates ......................................................................................................................... 3-6
3.3.2 System Information ............................................................................................................................... 3-7
3.3.3 GTN Setup Page.................................................................................................................................... 3-7
3.3.4 GTN Options Page ................................................................................................................................ 3-9
3.3.5 GTN Diagnostics Page ........................................................................................................................ 3-12
3.4 Database Updates ........................................................................................................................3-14
4 TROUBLESHOOTING...................................................................................................... 4-1
4.1 GTN General Troubleshooting......................................................................................................4-1
4.2 GTN Failure Annunciations ..........................................................................................................4-4
4.3 GTN System Messages..................................................................................................................4-5
4.3.1 GTN System Related Alerts .................................................................................................................. 4-5
4.4 GMA 35 Troubleshooting ...........................................................................................................4-15
4.4.1 GMA 35 Failure Annunciations .......................................................................................................... 4-15
4.4.2 GMA 35 Troubleshooting Guide......................................................................................................... 4-16
4.4.3 GMA 35 System Messages ................................................................................................................. 4-16
5 EQUIPMENT REMOVAL AND REINSTALLATION.................................................. 5-1
5.1 GTN...............................................................................................................................................5-1
5.1.1 Display of Self-Test Data ...................................................................................................................... 5-7
5.2 GMA 35.........................................................................................................................................5-8
5.3 SD Card .......................................................................................................................................5-10
5.4 GPS/WAAS Antenna ..................................................................................................................5-10

GTN 6XX/7XX Part 27 AML STC Maintenance Manual 190-01007-B1
Page ii Rev. 1
5.5 NAV Antenna Cable Diplexer.....................................................................................................5-10
5.6 NAV Antenna Cable Splitter.......................................................................................................5-11
5.7 Configuration Module (P1001 Only) ..........................................................................................5-11
5.8 GTN Fan......................................................................................................................................5-13
6 RETURN TO SERVICE..................................................................................................... 6-1
6.1 Maintenance Records ....................................................................................................................6-1
6.2 Return-to-Service Procedures........................................................................................................6-1
6.2.1 GTN 6XX/7XX ..................................................................................................................................... 6-1
6.2.2 GTN Configuration Module .................................................................................................................. 6-2
6.2.3 GTN Fan................................................................................................................................................ 6-2
6.2.4 GMA 35 (GTN 725/750 only)............................................................................................................... 6-2
6.2.5 Navigation Indicator.............................................................................................................................. 6-2
6.2.6 Transponder........................................................................................................................................... 6-2
6.2.7 Altitude encoder/Air Data Computer/Fuel-Air Data Computer............................................................ 6-2
6.2.8 Traffic/Weather System......................................................................................................................... 6-2
6.2.9 Radar Altimeter ..................................................................................................................................... 6-3
6.3 Configuration and Testing Procedures ..........................................................................................6-3
6.3.1 GTN 6XX/7XX Configuration and Testing.......................................................................................... 6-3
6.3.2 GTN Ground Checks............................................................................................................................. 6-3
6.3.3 GMA 35 Configuration and Testing...................................................................................................... 6-5
6.3.4 Interfaced Equipment Configuration and Checkout.............................................................................. 6-9
6.3.5 Navigation Indicator Configuration and Checkout ............................................................................... 6-9
6.3.6 Transponder......................................................................................................................................... 6-11
6.3.7 Traffic or Weather System .................................................................................................................. 6-13
6.3.8 Fan Interface Check............................................................................................................................. 6-14
6.3.9 Radar Altimeter Interface Check......................................................................................................... 6-14
6.4 Enabled Features..........................................................................................................................6-14
6.4.1 HTAWS Configuration and Checks (For Units with HTAWS Only)................................................. 6-14
APPENDIX A AIRCRAFT SPECIFIC INFORMATION............................................... A-1

190-01007-B1 GTN 6XX/7XX Part 27 AML STC Maintenance Manual
Rev. 1 Page iii
LIST OF FIGURES
Figure 2-1. GTN System Interface Diagram ..............................................................................................2-3
Figure 2-2. GTN 6XX/7XX Connector Layout Detail (GTN 650 and 750 shown)...................................2-4
Figure 2-3. GMA 35 System Interface Diagram ........................................................................................2-5
Figure 2-4. GMA 35 Rear Connectors .......................................................................................................2-5
Figure 3-1. GTN 6XX Control Features (GTN 650 shown) ......................................................................3-1
Figure 3-2. GTN 7XX Control Features (GTN 750 shown) ......................................................................3-1
Figure 3-3. GTN Software Updater ............................................................................................................3-2
Figure 3-4. System and Software Version..................................................................................................3-2
Figure 3-5. GTN Software Loader Card Formatting ..................................................................................3-3
Figure 3-6. Update Progress Window ........................................................................................................3-3
Figure 3-7. Update Completion ..................................................................................................................3-3
Figure 3-8. GTN 6XX and GTN 7XX Configuration Mode Pages............................................................3-5
Figure 3-9. GTN 7XX Updates Page..........................................................................................................3-6
Figure 3-10. System Information Page.......................................................................................................3-7
Figure 3-11. GTN 7XX Setup Page............................................................................................................3-7
Figure 3-12. GTN 7XX Options Page ........................................................................................................3-9
Figure 3-13. GTN 7XX Terrain Configuration Page..................................................................................3-9
Figure 3-14. Chart Configuration Page ....................................................................................................3-10
Figure 3-15. COM Transmit Power Configuration Page..........................................................................3-11
Figure 3-16. GTN 6XX and 7XX Diagnostics Pages...............................................................................3-12
Figure 4-1. Failure Screen ..........................................................................................................................4-4
Figure 4-2. GMA 35 Failure Annunciation ..............................................................................................4-15
Figure 5-1. GTN 7XX Mounting Rack Assembly......................................................................................5-3
Figure 5-2. GTN 6XX Mounting Rack Assembly......................................................................................5-5
Figure 5-3. GMA 35 Mounting Rack Assembly Overview .......................................................................5-9
Figure 5-4. Backshell Assembly (Potted Configuration Module)............................................................5-12
Figure 5-5. Fan/Backplate Orientation (GTN 7XX backplate shown).....................................................5-14
Figure 5-6. Fan Wiring Installation ..........................................................................................................5-15
Figure 6-1. Audio Panel Page.....................................................................................................................6-5
Figure 6-1. Audio Panel Configuration Page .............................................................................................6-5
Figure 6-2. Main Indicator (Analog) Configuration Page ..........................................................................6-9
Figure 6-3. VOR/LOC/GS Configuration Page..........................................................................................6-9
Figure 6-4. XPDR1 Configuration Page...................................................................................................6-11
Figure 6-5. Audio Configuration Page .....................................................................................................6-13
Figure 6-6. Terrain Configuration Page....................................................................................................6-13

GTN 6XX/7XX Part 27 AML STC Maintenance Manual 190-01007-B1
Page iv Rev. 1
LIST OF TABLES
Table 1-1. GTN Related Publications.........................................................................................................1-2
Table 3-1. GTN Database Summary.........................................................................................................3-14
Table 4-1. GTN Troubleshooting Guide.....................................................................................................4-1
Table 4-2. Alert Text Troubleshooting Guide.............................................................................................4-5
Table 4-3. COM Alert Troubleshooting Guide...........................................................................................4-7
Table 4-4. GPS/SBAS Alert Troubleshooting Guide .................................................................................4-9
Table 4-5. VLOC/GS Alert Troubleshooting Guide.................................................................................4-10
Table 4-6. Remote Transponder Alert Troubleshooting Guide ................................................................4-11
Table 4-7. Traffic Alert Troubleshooting Guide.......................................................................................4-12
Table 4-8. Database Alert Troubleshooting Guide ...................................................................................4-12
Table 4-9. HTAWS Alert Troubleshooting Guide ....................................................................................4-13
Table 4-10. Third-Party Sensor Alert Troubleshooting Guide .................................................................4-14
Table 4-11. GMA 35 Troubleshooting Guide...........................................................................................4-16
Table 4-12. Remote Audio Panel Alert Troubleshooting Guide ..............................................................4-16
Table 5-1. Self Test Values .........................................................................................................................5-7
Table 5-2. Configuration Module Wire Color Reference Chart ...............................................................5-11
Table 5-3. Configuration Module Kit 011-00979-03 (P1001)..................................................................5-11
Table 5-4. Fan Kit .....................................................................................................................................5-14
Table 5-5. Fan Cable Wire Color Reference Chart...................................................................................5-14

190-01007-B1 GTN 6XX/7XX Part 27 AML STC Maintenance Manual
Rev. 1 Page 1-1
1 INTRODUCTION
1.1 Scope
This document provides maintenance instructions for the GTN 6XX/7XX and GMA 35 as installed under
the GTN 6XX/7XX Part 27 STC.
1.2 Unit Return
A Return Merchandise Authorization (RMA) number must be requested from Garmin before a Garmin
unit is returned. Units returned without an RMA will be refused and returned at the sender's expense. Send
units with assigned RMA numbers to the following address:
Garmin International, Inc.
Factory Repair
1200 E. 151st St.
RMA Number: ________
Dock Door #20
Olathe, KS 66062
1.3 Organization
The following outline briefly describes the organization of this manual:
Section 2: System Description
Provides a description of the equipment installed by the GTN 6XX/7XX Part 27 STC. An overview of the
GTN and GMA 35 system interface is also provided.
Section 3: GTN Control and Operation
Presents basic control and operation information specifically tailored to maintenance practices. Basic GTN
Configuration Mode operation is also described as well as loading of software.
Section 4: Troubleshooting
This section provides troubleshooting information to aid in diagnosing and resolving potential problems
with the GTN and GMA 35 equipment.
Section 5: Equipment Removal & Replacement
This section provides instructions for the removal and replacement of the GTN and GMA 35 equipment.
Section 6: System Return to Service Procedure
This section provides instructions for the configuration and testing of the GTN and GMA 35 equipment.
This section specifies return-to-service procedures to be performed upon completion of maintenance of the
GTN and GMA 35 equipment.

GTN 6XX/7XX Part 27 AML STC Maintenance Manual 190-01007-B1
Page 1-2 Rev. 1
1.4 Abbreviations
For the sake of brevity, the GTN 6XX/7XX Part 27 AML STC Installation Manual (P/N 190-01007-B3)
may be referred to within this manual as the “STC IM”.
The following abbreviations are used within this document:
1.5 Publications
Table 1-1 lists publications related to the operation and maintenance of the GTN.
[1] Refer to this document for part numbers of model-specific Instructions for continued
Airworthiness (ICA).
AC: Alternating Current
AGC: Automatic Gain Control
AGCS: Automatic Ground Clutter Suppression
AHRS: Altitude and Heading Reference System
AML: Approved Model List
BIT: Built-In Test
CDI: Course Deviation Indicator
CFR: Code of Federal Regulations
COM: Communications
CRG: Cockpit Reference Guide
CSA: Conflict Situational Awareness
DME: Distance Measuring Equipment
EFIS: Electronic Flight Instrument System
EHSI: Electronic Horizontal Situation Indicator
FPGA: Field-Programmable Gate Array
G/S: Glideslope
GAD: Garmin Interface Adapter
GDL: Garmin Datalink
GMA: Garmin Audio Panel
GNS: Garmin Navigation System
GPS: Global Position System
GSR: Garmin Services
GTN: Garmin Touch Navigator
HSDB: High-Speed Data Bus
HTAWS: Helicopter Terrain Awareness System
ICA: Instructions for Continued Airworthiness
ICS: Intercom System
IFR: Instrument Flight Rules
ILS: Instrument Landing System
IRU: Inertial Reference Unit
LED: Light Emitting Diode
LOC: Localizer
LOI: Loss of Integrity
LRU: Line Replaceable Unit
MHz: Mega-Hertz
NAV: Navigation
OBS: Selected Course
PA: Passenger Address
PTC: Push-to-Command
PTT: Push-to-Talk
R/T: Radar Transceiver
RF: Radio Frequency
RMI: Bearing to Waypoint
RX: Receive
SBAS: Satellite Based Augmentation System
SDI: Source/Destination Identifiers
SSM: Sign/Status Matrix
STC: Supplemental Type Certificate
TAS: Traffic Advisory System
TCAS: Traffic Collision Avoidance System
TCAD: Traffic Collision Avoidance Device
TIS: Traffic Information Service
TSO: Technical Standard Order
TVS: Transient Voltage Suppressors
TX:Transmit
UTC: Coordinated Universal Time
VDC: Volts Direct Current
VFR: Visual Flight Rules
VHF: Very High Frequency
VOR: VHF Omnidirectional Range
WAAS: Wide Area Augmentation System
WXR: Weather Radar
XPDR: Transponder
Table 1-1. GTN Related Publications
Part Number Garmin Document
005-00533-H0 Master Drawing List, GTN 6XX/7XX Part 27 AML STC [1]
005-00533-H1 Equipment List, GTN 6XX/7XX Part 27 AML STC
190-01007-B3 GTN 6XX/7XX Part 27 AML STC Installation Manual

190-01007-B1 GTN 6XX/7XX Part 27 AML STC Maintenance Manual
Rev. 1 Page 1-3
1.6 Distribution
This document is required for maintaining the continued airworthiness of the rotorcraft. When this
document is revised, every page will be revised to indicate the current revision level. Garmin Dealers may
obtain the latest revision of this document on the Garmin Dealer Resource Center website.
Owner/operators may obtain the latest revision of this document from www.flyGarmin.com or by
contacting a Garmin dealer. Other contacts include Garmin Product Support at 913-397-8200 (toll free
866-739-5687) or using around the world contact information on www.flyGarmin.com.
A Garmin Service Bulletin describing the revision to this document will be sent to Garmin dealers if the
revision is determined to be significant.

GTN 6XX/7XX Part 27 AML STC Maintenance Manual 190-01007-B1
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190-01007-B1 GTN 6XX/7XX Part 27 AML STC Maintenance Manual
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2 SYSTEM DESCRIPTION
2.1 Equipment Descriptions
The GTN (Garmin Touch Navigation) WAAS navigators are a family of aviation panel mounted retrofit
products. The following sections will describe the available functions for each unit in the GTN 6XX/7XX
navigators.
2.1.1 GTN 6XX
The GTN 6XX WAAS navigators are a family of panel-mounted GPS/NAV/COM navigators.The
GTN 6XX units include the GTN 625, GTN 635, and GTN 650. They are 6.25 inches wide and 2.65
inches tall. The GTN 6XX features a 600 by 266 pixel color LCD touchscreen. The GTN 625 is a GPS/
SBAS unit that meets the requirements of Technical Standard Order TSO-C146c. The GTN 635 includes
all of the features of the GTN 625 in addition to an airborne VHF communications transceiver. The
GTN 650 includes all of the features of the GTN 625 in addition to an airborne VHF communications
transceiver and airborne VOR/localizer (LOC) and glideslope (G/S) receivers.
2.1.2 GTN 7XX
The GTN 7XX WAAS navigators are a family of GPS/NAV/COM aviation panel-mounted products. The
GTN 7XX units include the GTN 725 and GTN 750. The GTN 7XX units are 6.25 inches wide and 6.00
inches tall. They feature a 600 by 708 pixel color LCD touchscreen. The GTN 725 is a GPS/SBAS unit
that meets the requirements of Technical Standard Order TSO-C146c. The GTN 750 includes all of the
features of the GTN 725 in addition to an airborne VHF communications transceiver and airborne VOR/
localizer (LOC) and glideslope (G/S) receivers. The GTN 725 and 750 also have the ability to remotely
control GMA 35 audio panel functions.
2.1.3 GMA 35 Audio Panel
The GMA 35 audio panel is both a marker beacon receiver and an audio panel with 6-place intercom that
interfaces to the communications and navigation radios, headsets, microphones, and speakers. The 
GMA 35 is remote-mounted and relies upon the GTN 725 or GTN 750 to control and display the audio
functions.
The GMA 35 interfaces to the GTN 7XX via RS-232 for control and display of audio panel functions.
Additionally, the GMA 35 includes a six-position intercom system (ICS) with electronic cabin noise de-
emphasis, two stereo music inputs, and independent pilot, copilot, and passenger volume controls. The
intercom provides three selectable isolation modes. A pilot-selectable cabin speaker output can be used to
listen to the selected rotorcraft radios or to broadcast PA announcements.
2.1.4 NAV Antenna Cable Splitter
The navigation antenna cable splitter (Garmin P/N 013-00112-00) is used for installations involving dual
VHF navigation capable GTNs or a single VHF navigation capable GTN installation with a second non-
Garmin navigation unit.
2.1.5 NAV Antenna Cable Diplexer
The GTN 650/750 navigation units have a single navigation antenna port and thus require a composite
signal for those installations which include separate VOR/LOC and G/S antennas. The navigation diplexer
(Comant diplexer VOR/GS, Model CI-507) is used for these installations.

GTN 6XX/7XX Part 27 AML STC Maintenance Manual 190-01007-B1
Page 2-2 Rev. 1
2.1.6 HTAWS Annunciator
Installation of HTAWS annunciators may be required when the optional HTAWS feature is activated.
Refer to the model specific installation drawing and the STC IM for HTAWS annunciator installation and
equipment details.
2.1.7 Cyclic Control Grip
An optional Otto Controls flight control grip kit (Otto Controls P/N G2-0048 or G2-B-8) may be included
with the GTN installation. Refer to the model-specific installation drawing for eligibility and detailed
cyclic control grip kit information.
2.2 GTN System Interfaces
2.2.1 GTN Optional Interfaces
Optional equipment interfaces to the GTN include:
Audio Panel
Air Data Computer
Altitude Serializer or Fuel/Air Data Computers
GDU 620
IRU/AHRS
Navigation Indicators
Weather, Traffic, Terrain Systems
HTAWS Annunciator Panels
Multifunction Displays
Interface Adapters
Iridium Transceiver
Radar Altimeter

190-01007-B1 GTN 6XX/7XX Part 27 AML STC Maintenance Manual
Rev. 1 Page 2-3
2.2.2 GTN 6XX/7XX Interfaces
The GTN utilizes ARINC 429, RS-232, discrete inputs/outputs, and Garmin High Speed Data Bus (HSDB)
interfaces to communicate with other LRUs and Systems on the rotorcraft. A summary of the GTN
interfaces are shown in Figure 2-1.
Figure 2-1. GTN System Interface Diagram
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GTN 6XX/7XX Part 27 AML STC Maintenance Manual 190-01007-B1
Page 2-4 Rev. 1
The GTN 6XX/7XX interface with other avionics equipment through the rear connectors shown in
Figure 2-2. The COM board is present only on the GTN 635, 650, and 750. The NAV board is present only
on the GTN 650 and 750.
Figure 2-2. GTN 6XX/7XX Connector Layout Detail (GTN 650 and 750 shown)
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NOTE
The COM board is not present in the GTN 625 or 725, and the NAV board is not present
in the GTN 625, 635, or 725. Empty COM and NAV board connector positions on the
these models are concealed with cover plates.

190-01007-B1 GTN 6XX/7XX Part 27 AML STC Maintenance Manual
Rev. 1 Page 2-5
2.2.3 GMA 35 Equipment Interfaces
The GMA 35 utilizes RS-232, discrete inputs/outputs, and analog audio inputs/outputs to communicate
with other systems on the rotorcraft. A summary of the GMA 35 interfaces is shown in
Figure 2-3.
Figure 2-3. GMA 35 System Interface Diagram
The GMA 35 interfaces with other avionics equipment through the rear connectors shown in Figure 2-4.
Figure 2-4. GMA 35 Rear Connectors
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GTN 6XX/7XX Part 27 AML STC Maintenance Manual 190-01007-B1
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190-01007-B1 GTN 6XX/7XX Part 27 AML STC Maintenance Manual
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3 GTN CONTROL AND OPERATION
3.1 GTN Controls
Figure 3-1. GTN 6XX Control Features (GTN 650 shown)
Figure 3-2. GTN 7XX Control Features (GTN 750 shown)

GTN 6XX/7XX Part 27 AML STC Maintenance Manual 190-01007-B1
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3.2 Software Loading
3.2.1 GTN Software Loader Card Creation
A GTN Software Loader Card may be created using GTN Downloadable Software and an SD card in
conjunction with a GTN software application downloaded from the Dealer Resource Center on Garmin’s
website. The Dealer Resource Center will allow the technician to choose which software package(s) to
load onto the card.
NOTE
The downloadable application to create the GTN Software Loader Card only runs on PCs
with Windows. Windows 2000, XP, Vista, and Windows 7 are supported. There is no
Macintosh support at this time.
NOTE
An SD card reader is needed to create the GTN Software Loader card using the
application that is downloaded from Garmin. The approved readers are SanDisk®

SDDR-999 and SDDR-93, although other SD card readers will work.
Create a GTN Software Loader Card as follows:
1. Go to the Garmin Dealer Resource Center.
2. Download the GTN Software Loader Image.
Refer to the Equipment List
(P/N 005-00533-H1) for the correct Software
Loader Image part number.
3. Ensure that you have an SD card reader
connected to the PC. Insert the SD Card into
the card reader.
4. Run the executable file. The screen shown in
Figure 3-3 will appear.
5. Click Setup. The window shown in
Figure 3-4 will appear to guide you through
the software loader card creation process.
Figure 3-3. GTN Software Updater
Figure 3-4. System and Software Version