Garmin GMA 35, GTN 750, GTN 725, GTN 650, GTN 625 User Manual

GTN 6XX/7XX

Part 27 AML STC Maintenance Manual

190-01007-B1 January 2020 Revision 4

©2020 Garmin International or its subsidiaries

All Rights Reserved

Except as expressly provided herein, no part of this manual may be reproduced, copied, transmitted,
disseminated, downloaded or stored in any storage medium, for any purpose without the express prior
written consent of Garmin. Garmin hereby grants permission to download a single copy of this manual and
of any revision to this manual onto a hard drive or other electronic storage medium to be viewed and to
print one copy of this manual or of any revision hereto, provided that such electronic or printed copy of this
manual or revision must contain the complete text of this copyright notice and provided further that any
unauthorized commercial distribution of this manual or any revision hereto is strictly prohibited.

Adobe® is a registered trademark of Adobe Systems Incorporated. All rights reserved.

© 2020 Sirius Satellite Radio®, Sirius®, SiriusXM, XM®, the dog logo, SiriusXM Internet Radio, and the
XM logo are trademarks, service marks or registered marks of Sirius XM Radio Inc. (“Marks”). All other
marks and logos are property of their respective owners. All rights reserved.

Garmin®, FliteCharts®, and SafeTaxi® are registered trademarks of Garmin International or its
subsidiaries. Connext™, Garmin Pilot™, GDU™, GTN™, and Telligence™ are trademarks of Garmin
International or its subsidiaries. These trademarks may not be used without the express permission of
Garmin.

© 2004-2020 SD-3C, LLC. All rights reserved. The SD trademarks and logos featured in this document
are owned and licensed by SD-3C, LLC. The SD Marks and Logos are registered with the United States
Patent and Trademark Office and with other trademark offices around the world. SD-3C also owns design
patents associated with SD memory cards and SD related technology.

At Garmin, we value your opinion.
Please send comments on this manual to [e-mail]

Garmin International, Inc.
1200 E. 151

st Street Olathe, KS 66062 USA

Telephone: [phone]

Aviation Dealer Technical Support Line
Telephone: [phone]
Fax: [phone]

flyGarmin.com

Garmin (Europe) Ltd.
Liberty House
Bull Copse Road
Hounsdown Business Park
Southampton, SO40 9LR, UK
Telephone: [phone]
Fax: [phone]
Aviation Support: [phone]

Garmin AT, Inc.
2345 Turner Rd. SE
Salem, OR 97302 USA
Telephone: [phone]

.

190-01007-B1 GTN 6XX/7XX Part 27 AML STC Maintenance Manual
Rev. 4 Page A

RECORD OF REVISIONS

Revision Revision Date Description

2 3/29/16 Added software v6.11 functionality.

3 12/4/18 Added software v6.51 functionality.

4 1/29/20 Added software v6.70 functionality. Added Flight Stream 510 support.

CURRENT REVISION DESCRIPTION

Section Description

Included Flight Stream 510 to references of GTN and GMA 35 installations where
appropriate.

2.1.4 Added section for description of Flight Stream 510.

2.2.1

2.2.2 Updated Figure 2-1 GTN System Interface Diagram to include new interfaces.

3.2.1

3.3

3.3.3

3.3.4.1.1 Updated HTAWS configuration settings options.

3.3.5

3.4 Updated database update procedure to include Flight Stream 510.

4.3.1.1 Corrected COM connector to P1003-44.

4.4 Added Section 4.4 Flight Stream 510 Troubleshooting.

5.3 Added Flight Stream 510 to section.

6.2.10 Added Section 6.2.10 Flight Stream 510.

Updated list of optional GTN interfaces to include G500H TXi (EFIS display), Garmin
ADS-B traffic and FIS-B weather, and Flight Stream 510.

Added Windows 10 as a compatible operating system to run the application to create a
software loader card.

Updated software version to v6.70 and updated screen shots in following sections where
required.

Added vertical navigation settings to the description of the Navigation Features page.

Added Flight Stream page description and Update Config Module button description.

Updated diagnostic page titles and descriptions to compare with changes in v6.70
software.

6.3.5 Added COM RX Squelch Check.

6.6.5 Added Section 6.6.5 Display checkout.

6.11 Added Section 6.11 Flight Stream 510 Interface Checks.

Appendix A Updated Configuration Log and included new features/settings.

190-01007-B1 GTN 6XX/7XX Part 27 AML STC Maintenance Manual
Rev. 4 Page B

INFORMATION SUBJECT TO EXPORT CONTROL LAWS

This document may contain information that is subject to the Export Administration Regulations (EAR)
issued by the United States Department of Commerce (15 CFR, Chapter VII, Subchapter C) and 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

WARNING

A Warning means injury or death is possible if the instructions are not obeyed.

CAUTION

A Caution means that damage to the equipment is possible.

NOTE

A Note gives more information.

CAUTION

GTN 6XX/7XX units have a special anti-reflective coated display that is sensitive to waxes
and abrasive cleaners. CLEANERS CONTAINING AMMONIA WILL HARM THE
COATING. It is important to clean the display using a clean, lint-free cloth and a cleaner
that is safe for anti-reflective coatings.

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.

190-01007-B1 GTN 6XX/7XX Part 27 AML STC Maintenance Manual
Rev. 4 Page i

TABLE OF CONTENTS

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

1.1 Scope .......................................................................................................................................1-2

1.2 Unit Return ..............................................................................................................................1-2

1.3 Organization ............................................................................................................................1-2

1.4 Abbreviations ..........................................................................................................................1-3

1.5 Publications .............................................................................................................................1-4

1.6 Distribution ..............................................................................................................................1-4

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

2.1 Equipment Descriptions ..........................................................................................................2-2

2.2 GTN System Interfaces ...........................................................................................................2-4

3 GTN CONTROL AND OPERATION ............................................................................................3-1

3.1 GTN Controls ..........................................................................................................................3-2

3.2 Software Loading ....................................................................................................................3-3

3.3 GTN Configuration Mode Overview ......................................................................................3-7

3.4 Database Updates ..................................................................................................................3-19

4 TROUBLESHOOTING ...................................................................................................................4-1

4.1 GTN General Troubleshooting ................................................................................................4-2

4.2 GTN Failure Annunciations ....................................................................................................4-5

4.3 GTN System Messages ...........................................................................................................4-6

4.4 Flight Stream 510 Troubleshooting .......................................................................................4-16

4.5 GMA 35 Troubleshooting .....................................................................................................4-17

5 EQUIPMENT REMOVAL AND REPLACEMENT ....................................................................5-1

5.1 GTN .........................................................................................................................................5-2

5.2 GMA 35 ...................................................................................................................................5-8

5.3 Data Card/Flight Stream 510 .................................................................................................5-11

5.4 GPS/WAAS Antenna ............................................................................................................5-11

5.5 NAV Antenna Cable Diplexer ..............................................................................................5-12

5.6 NAV Antenna Cable Splitter .................................................................................................5-12

5.7 Configuration Module (P1001 Only) ....................................................................................5-13

5.8 GTN Cooling Fan ..................................................................................................................5-14

6 RETURN TO SERVICE ..................................................................................................................6-1

6.1 Maintenance Records ..............................................................................................................6-3

6.2 Return to Service Procedures ..................................................................................................6-4

6.3 GTN Configuration and Testing .............................................................................................6-7

6.4 GMA 35 Configuration and Testing .....................................................................................6-11

6.5 Interfaced Equipment Configuration and Checkout ..............................................................6-16

6.6 Navigation Indicator Configuration and Checkout ...............................................................6-17

6.7 Transponder ...........................................................................................................................6-21

6.8 Traffic or Weather System ....................................................................................................6-23

6.9 Fan Interface Check ...............................................................................................................6-24

6.10 Radar Altimeter Interface Check ...........................................................................................6-24

6.11 Flight Stream 510 Interface Checks ......................................................................................6-24

6.12 Enabled Features ...................................................................................................................6-25

190-01007-B1 GTN 6XX/7XX Part 27 AML STC Maintenance Manual
Rev. 4 Page ii

6.13 HTerrain/HTAWS System Checks (For Units with HTerrain/HTAWS Only) ....................6-26

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

190-01007-B1 GTN 6XX/7XX Part 27 AML STC Maintenance Manual
Rev. 4 Page iii

LIST OF FIGURES

Figure 2-1 GTN System Interface Diagram ..........................................................................................2-5

Figure 2-2 GTN 6XX/7XX Connector Layout Detail...........................................................................2-6

Figure 2-3 GMA 35 System Interface Diagram....................................................................................2-7

Figure 2-4 GMA 35 Rear Connectors ...................................................................................................2-7

Figure 3-1 GTN 6XX Control Features (GTN 650 Shown)..................................................................3-2

Figure 3-2 GTN 7XX Control Features (GTN 750 Shown)..................................................................3-2

Figure 3-3 GTN Software Updater........................................................................................................3-3

Figure 3-4 System and Software Version..............................................................................................3-4

Figure 3-5 GTN Software Loader Card Formatting..............................................................................3-4

Figure 3-6 Update Progress Window ....................................................................................................3-4

Figure 3-7 Update Completion..............................................................................................................3-5

Figure 3-8 GTN 6XX and GTN 7XX Configuration Mode Pages .......................................................3-7

Figure 3-9 GTN 7XX Updates Page .....................................................................................................3-8

Figure 3-10 System Information Page.....................................................................................................3-9

Figure 3-11 GTN 7XX GTN Setup Page ..............................................................................................3-10

Figure 3-12 GTN 7XX Options Page....................................................................................................3-12

Figure 3-13 GTN 7XX Terrain Configuration Page .............................................................................3-13

Figure 3-14 Chart Configuration Page ..................................................................................................3-14

Figure 3-15 COM Transmit Power Configuration Page .......................................................................3-15

Figure 3-16 Search and Rescue Configuration Page.............................................................................3-16

Figure 3-17 GTN 6XX and 7XX Diagnostics Pages.............................................................................3-17

Figure 4-1 Failure Screen ......................................................................................................................4-5

Figure 4-2 GMA 35 Failure Annunciation..........................................................................................4-17

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....................................................................................5-9

Figure 5-4 GMA 35c Mounting Rack Assembly Overview ...............................................................5-10

Figure 5-5 Backshell Assembly...........................................................................................................5-13

Figure 5-6 Fan Location on GTN Backplate (GTN 7XX Shown) ......................................................5-14

Figure 5-7 Fan Wiring Installation ......................................................................................................5-15

Figure 6-1 Audio Panel Configuration Page .......................................................................................6-11

Figure 6-2 Main Indicator (Analog) Configuration Page....................................................................6-17

Figure 6-3 VOR/LOC/GS Configuration Page ...................................................................................6-18

Figure 6-4 XPDR1 Configuration Page ..............................................................................................6-21

Figure 6-5 Audio Configuration Page .................................................................................................6-26

Figure 6-6 Terrain Configuration Page ...............................................................................................6-26

190-01007-B1 GTN 6XX/7XX Part 27 AML STC Maintenance Manual
Rev. 4 Page iv

LIST OF TABLES

Table 1-1 GTN Related Publications ......................................................................................................1-4

Table 3-1 GTN Database Summary ......................................................................................................3-19

Table 4-1 GTN Troubleshooting Guide ..................................................................................................4-2

Table 4-2 Alert Text Troubleshooting Guide ..........................................................................................4-6

Table 4-3 COM Alert Troubleshooting Guide.........................................................................................4-8

Table 4-4 GPS/SBAS Alert Troubleshooting Guide .............................................................................4-10

Table 4-5 VLOC/GS Alert Troubleshooting Guide...............................................................................4-11

Table 4-6 Remote Transponder Alert Troubleshooting Guide ..............................................................4-12

Table 4-7 Traffic Alert Troubleshooting Guide.....................................................................................4-13

Table 4-8 Data Link Alert Troubleshooting Guide................................................................................4-13

Table 4-9 HTAWS Alert Troubleshooting Guide..................................................................................4-14

Table 4-10 Third-Party Sensor Alert Troubleshooting Guide .................................................................4-15

Table 4-11 Flight Stream 510 Troubleshooting.......................................................................................4-16

Table 4-12 GMA 35 Troubleshooting Guide...........................................................................................4-18

Table 4-13 Remote Audio Panel Alert Troubleshooting Guide...............................................................4-19

Table 5-1 Self-Test Values.......................................................................................................................5-7

Table 5-2 Configuration Module Wire Color Reference Chart.............................................................5-13

Table 5-3 Configuration Module Kit P/N 011-00979-03 (P1001) ........................................................5-13

Table 5-4 Fan Kit...................................................................................................................................5-15

Table 5-5 Fan Cable Wire Color Reference Chart ................................................................................5-15

Table 6-1 Summary of COM RX Squelch Settings and Auto Squelch Levels .......................................6-9

Table 6-2 COM Carrier Squelch Selections..........................................................................................6-10

Table 6-1 COM Carrier Squelch Selections..........................................................................................6-10

190-01007-B1 GTN 6XX/7XX Part 27 AML STC Maintenance Manual
Rev. 4 Page v

1 INTRODUCTION

1.1 Scope ...............................................................................................................................................1-2

1.2 Unit Return ......................................................................................................................................1-2

1.3 Organization ....................................................................................................................................1-2

1.4 Abbreviations ..................................................................................................................................1-3

1.5 Publications .....................................................................................................................................1-4

1.6 Distribution .....................................................................................................................................1-4

190-01007-B1 GTN 6XX/7XX Part 27 AML STC Maintenance Manual
Rev. 4 Page 1-1

1.1 Scope

This document provides maintenance instructions for the GTN 6XX/7XX, GMA 35/35c, and Flight
Stream 510 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, GMA 35, and Flight Stream 510 system interfaces are 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, GMA 35, and Flight Stream 510 equipment.

Section 5: Equipment Removal and Replacement

This section provides instructions for the removal and replacement of the GTN, GMA 35, and Flight
Stream 510 equipment.

Section 6: System Return to Service Procedure

This section provides instructions for the configuration and testing of the GTN, GMA 35, and Flight
Stream 510 equipment.

This section specifies return to service procedures to be performed upon completion of maintenance of the
GTN, GMA 35, and Flight Stream 510 equipment.

190-01007-B1 GTN 6XX/7XX Part 27 AML STC Maintenance Manual
Rev. 4 Page 1-2

1.4 Abbreviations

The GTN 6XX/7XX Part 27 AML STC Installation Manual may be referred to within this manual as the
STC IM. Except where specifically noted, references made to the GMA 35 will apply to the GMA 35c as
well. The following abbreviations are used within this document:

AC Alternating Current
ADS-B Automatic Dependent Surveillance-

Broadcast
AGC Automatic Gain Control
AGCS Automatic Ground Clutter Suppression
AHRS Altitude and Heading Reference System
AML Approved Model List
ASR Automatic Speech Recognition
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
ELT Emergency Locator Transmitter
ES Extended Squitter
FPGA Field-Programmable Gate Array
GS Glideslope
GAD Garmin Interface Adapter
GDL Garmin Datalink
GDU Garmin Display Unit
GMA Garmin Audio Panel
GNS Garmin Navigation System
GPS Global Position System
GSR Garmin Services
GTN Garmin Touch Navigator
GWX Garmin Weather Radar
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
MKR Marker Beacon
MOT Mark on Target
NAV Navigation
NV Night Vision
OBS Omni Bearing Selector
PA Passenger Address
PED Portable Electronic Device
POH Pilot’s Operating Handbook
PTC Push-to-Command
PTT Push-to-Talk
R/T Radar Transceiver
RAIM Receiver Autonomous Integrity

Monitoring
RF Radio Frequency
RFMS Rotorcraft Flight Manual Supplement
RMI Radio Magnetic Indicator
RX Receive
SAR Search and Rescue
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
VLOC VOR/LOC
VOR VHF Omni-directional Range
WAAS Wide Area Augmentation System
WXR Weather Radar
XPDR Transponder

190-01007-B1 GTN 6XX/7XX Part 27 AML STC Maintenance Manual
Rev. 4 Page 1-3

1.5 Publications

Publications related to the operation and maintenance of the GTN are listed in Table 1-1.

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

Notes:

[1] Refer to this document for part numbers of model-specific Instructions for Continued

Airworthiness (ICA).

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 flyGarmin.com

or by contacting a
Garmin dealer. Other contacts include Garmin Product Support at [phone],
[phone], or using around the world contact information on 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.

190-01007-B1 GTN 6XX/7XX Part 27 AML STC Maintenance Manual
Rev. 4 Page 1-4

2 SYSTEM DESCRIPTION

2.1 Equipment Descriptions ..................................................................................................................2-2

2.1.1 GTN 6XX ................................................................................................................................2-2

2.1.2 GTN 7XX ................................................................................................................................2-2

2.1.3 GMA 35/35c Audio Panel .......................................................................................................2-2

2.1.4 Flight Stream 510 .......................................................................................................................2-2

2.1.5 NAV Antenna Cable Splitter ...................................................................................................2-3

2.1.6 NAV Antenna Cable Diplexer ................................................................................................2-3

2.1.7 HTAWS Annunciator ..............................................................................................................2-3

2.1.8 Cyclic Control Grip .................................................................................................................2-3

2.2 GTN System Interfaces ...................................................................................................................2-4

2.2.1 GTN Optional Interfaces .........................................................................................................2-4

2.2.2 GTN 6XX/7XX Interfaces ......................................................................................................2-5

2.2.3 GMA 35 Equipment Interfaces ...............................................................................................2-7

190-01007-B1 GTN 6XX/7XX Part 27 AML STC Maintenance Manual
Rev. 4 Page 2-1

2.1 Equipment Descriptions

The GTN WAAS navigators are a family of aviation panel-mounted 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.GTN 6XX
units include the GTN 625, GTN 635, and GTN 650. GTN 6XX units are 6.25 inches wide and 2.65 inches
tall. The GTN 6XX features a 600 × 266 pixel color LCD touchscreen. The GTN 625 is a GPS/SBAS unit
that meets the requirements of 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/LOC and G/S
receivers.

2.1.2 GTN 7XX

The GTN 7XX WAAS navigators are a family of GPS/NAV/COM aviation panel-mounted products.
GTN 7XX units include the GTN 725 and GTN 750. GTN 7XX units are 6.25 inches wide and 6.00 inches
tall. They feature a 600 × 708 pixel color LCD touchscreen. The GTN 725 is a GPS/SBAS unit that meets
the requirements of 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/LOC and GS receivers. The GTN 725 and 750 also have the ability to remotely control GMA 35
audio panel functions.

2.1.3 GMA 35/35c Audio Panel

The GMA 35 Audio Panel is both a marker beacon receiver and an audio panel with a 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 35c provides the functionality of the GMA 35 with the added capability to pair
Bluetooth™ audio sources. This enables the distribution of audio to ICS positions when using a
compatible device. The GMA 35c supports up to ten stored devices and one active Bluetooth device.

The GMA 35 interfaces to the GTN 7XX via RS-232 for control and display of audio panel functions. The
GMA 35 includes a six-position ICS with electronic cabin noise de-emphasis, two stereo music inputs, and
independent pilot/co-pilot/passenger volume controls. The intercom provides three selectable isolation
modes. A pilot-selectable cabin speaker output is used to listen to the selected rotorcraft radios or to
broadcast PA announcements.

2.1.4 Flight Stream 510

NOTE

The Flight Stream 510 is a wireless-enabled data card that is inserted into the GTN data
card slot.

The Flight Stream 510 interfaces to the GTN 6XX/7XX by replacing the front-loaded data card to allow
wireless database synchronization with PEDs. Synchronized information is then disseminated to various
LRUs through their existing GTN interface connections.

190-01007-B1 GTN 6XX/7XX Part 27 AML STC Maintenance Manual
Rev. 4 Page 2-2

2.1.5 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.

2.1.6 NAV Antenna Cable Diplexer

GTN 650/750 navigation units have a single navigation antenna port and require a composite signal for
those installations that include separate VOR/LOC and GS antennas. The navigation diplexer (Comant
diplexer VOR/GS, Model CI-507) is used for these installations.

2.1.7 HTAWS Annunciator

Installation of HTAWS annunciators is required when the optional HTAWS feature is activated. For
HTAWS annunciator installation and equipment details, refer to the model-specific installation drawing.

2.1.8 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. For eligibility and detailed cyclic control grip kit information, refer to
the model-specific installation drawing.

190-01007-B1 GTN 6XX/7XX Part 27 AML STC Maintenance Manual
Rev. 4 Page 2-3

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
 EFIS displays
 Navigation indicators
 Weather, traffic, and terrain systems
 HTAWS annunciator panels
 Garmin Iridium transceiver
 Radar altimeter
 Garmin ADS-B traffic and FIS-B weather sources
 Flight Stream 510

190-01007-B1 GTN 6XX/7XX Part 27 AML STC Maintenance Manual
Rev. 4 Page 2-4

2.2.2 GTN 6XX/7XX Interfaces

GTN 6XX/7XX

Crossfill

(from another GTN

or GTN Xi

[1]

)

Switc hes/

Annunciators

Air D ata

Fuel Management

System

Altitude Encoder

Transponder

Radar Altimeter

Traffic Syst em

Datalink

(XM Radio, NEXRAD,

etc.)

GPS/WAAS Antenna

NAV Antenna

(GTN 650Xi/750Xi)

COM Antenna

(G TN 6 35Xi/65 0Xi /7 50Xi)

Audio Panel

PFD/MFD

(G500H/G500H TXi)

CDI/HSI

GSR 56

Flight

Stream

510

Portable

Electronic

Device

GDL 88H

Notes:

[1] GTN 6XX/ 7XX – GT N Xi Crossfill

re qui res GTN so ft ware v6 .70 or
later.

The GTN utilizes ARINC 429, RS-232, discrete inputs/outputs, and HSDB interfaces to communicate with
other LRUs and systems on the rotorcraft. A summary of GTN interfaces is shown in Figure 2-1.

190-01007-B1 GTN 6XX/7XX Part 27 AML STC Maintenance Manual
Rev. 4 Page 2-5

Figure 2-1 GTN System Interface Diagram

The GTN 6XX/7XX interfaces with other avionics equipment through the rear connectors. The COM

V

V

board is available only in the GTN 635, 650, and 750. The NAV board is present only in the
GTN 650 and 750.

NOTE

Empty COM and NAV board connector positions on the these models are concealed with
cover plates.

MAIN

NA

(GTN 650 only)

MAIN

J1001

J1002

J1008

J1004

J1001

J1002

J1006

J1007

J1003

J1005

J1006

GPS

COM

(GTN 635/650 only)

I/O

GPS

J1007

J1003

COM

(GTN 750 only)

J1008

NA

(GTN 750 only)

J1004

Figure 2-2 GTN 6XX/7XX Connector Layout Detail

GTN 650 (top) and 750 (bottom) shown

190-01007-B1 GTN 6XX/7XX Part 27 AML STC Maintenance Manual
Rev. 4 Page 2-6

2.2.3 GMA 35 Equipment Interfaces

Garmin

GMA 35

Audio Panel

GTN 7XX

Control Head

COM 1

Transceiver

COM 2

Transceiver

COM 3

Transceiver

NAV 1 Radio

NAV 2 Radio

Marker

Beacon

Annunciators

Telephone

Audio

Bluetooth

Audio [1]

Music Input (x2)

Unswitched,

Unmuted Audio

Input (x4)

Cockpit Speaker

Marker Beacon

Antenna

Pilot/Co-pilot

Headsets (x2)

Passeng er

Headsets (x5)

RS-232

Notes:

[1] GMA 35c o nly.

J3501 J3502

The GMA 35 utilizes RS-232, discrete inputs/outputs, and analog audio inputs/outputs to communicate
with other systems on the rotorcraft.

Figure 2-3 GMA 35 System Interface Diagram

The GMA 35 interfaces with other avionics equipment through the rear connectors. The GMA 35c has a
connector for the Bluetooth antenna on the front of the unit.

Figure 2-4 GMA 35 Rear Connectors

190-01007-B1 GTN 6XX/7XX Part 27 AML STC Maintenance Manual
Rev. 4 Page 2-7

3 GTN CONTROL AND OPERATION

3.1 GTN Controls ..................................................................................................................................3-2

3.2 Software Loading ............................................................................................................................3-3

3.2.1 GTN Software Loader Card Creation .....................................................................................3-3

3.2.2 GMA 35 Software Loading .....................................................................................................3-5

3.2.3 GMA 35 Boot Block Loading .................................................................................................3-6

3.3 GTN Configuration Mode Overview ..............................................................................................3-7

3.3.1 GTN Software Updates ...........................................................................................................3-8

3.3.2 System Information .................................................................................................................3-9

3.3.3 GTN Setup Page ....................................................................................................................3-10

3.3.4 GTN Options Page ................................................................................................................3-12

3.3.5 GTN Diagnostics Page ..........................................................................................................3-17

3.4 Database Updates ..........................................................................................................................3-19

190-01007-B1 GTN 6XX/7XX Part 27 AML STC Maintenance Manual
Rev. 4 Page 3-1

3.1 GTN Controls

Figure 3-1 GTN 6XX Control Features (GTN 650 Shown)

Figure 3-2 GTN 7XX Control Features (GTN 750 Shown)

190-01007-B1 GTN 6XX/7XX Part 27 AML STC Maintenance Manual
Rev. 4 Page 3-2

3.2 Software Loading

3.2.1 GTN Software Loader Card Creation

NOTE

The application to create the GTN Software Loader Card runs on PCs with Windows
(Windows 2000, XP, Vista, Windows 7, and Windows 10). There is no Macintosh support at
this time.

NOTE

An data 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 data card readers may work.

A GTN Software Loader Card is created using GTN Downloadable Software and a data card with the GTN
software application. It is downloaded from the Dealer Resource Center
Resource Center allows the technician to choose which software package(s) to load onto the card.

Create a GTN Software Loader Card as follows:

on Garmin’s website. The Dealer

CAUTION

In order to create a GTN Software Loader Card, the drive that you select will be
completely erased.

1. Go to the Garmin Dealer Resource Center

2. Download the GTN Software Loader Image. For the correct Software Loader Image part number,
refer to the Equipment List.

3. Connect a data card reader to the PC.

4. Insert the data card into the card reader.

5. Run the executable file.

6. Click Setup.

Figure 3-3 GTN Software Updater

.

190-01007-B1 GTN 6XX/7XX Part 27 AML STC Maintenance Manual
Rev. 4 Page 3-3

7. Click Next.

Figure 3-4 System and Software Version

8. Ensure that the correct drive is selected and click Next.

Figure 3-5 GTN Software Loader Card Formatting

9. Click Next to acknowledge any warnings that appear.

Figure 3-6 Update Progress Window

190-01007-B1 GTN 6XX/7XX Part 27 AML STC Maintenance Manual
Rev. 4 Page 3-4

10. Click Finish.

Figure 3-7 Update Completion

11. Eject the card from the card reader or stop the card reader in Windows.

3.2.2 GMA 35 Software Loading

NOTE

The GMA 35 software will be present on the data card when creating a GTN Software
Loader Card. A separate card is not required to perform GMA 35 software updates.

1. Remove power from the GTN 7XX.

2. Insert the GTN Software Loader Card into the GTN 7XX data card slot. For instructions on how to
create a GTN Software Loader Card, refer to Section 3.2.1.

3. Hold down the HOME key until “Garmin” is fully lit on the display after power is applied to the
GTN 7XX.

4. Ensure the GMA 35 circuit breaker is closed.

5. Touch the Updates key. To display available software, touch the Updates key.

6. Touch the Updates key.

7. Touch GMA 35 Software Updates.

8. Touch Select All.

9. Touch the Updates key.

10. Touch OK.

11. When completed, remove power from the GTN and GMA 35.

12. Remove the Software Loader Card.

13. Re-insert the database card into the data card slot.

14. Restore power on the GTN and GMA 35.

15. Ensure the software was updated correctly. Refer to Section 3.3.2.

190-01007-B1 GTN 6XX/7XX Part 27 AML STC Maintenance Manual
Rev. 4 Page 3-5

3.2.3 GMA 35 Boot Block Loading

NOTE

The GMA 35 Boot Block Loader Card is separate from the GMA 35 Software Loader Card
and is required to update Boot Block software to v4.10. Refer to Section 3.2.1 for
instructions on how to create the GTN Software Loader Card.

1. Remove power from the GTN 7XX.

2. Insert the GTN Boot Block Loader Card into the GTN 7XX data card slot.

3. Make sure the GMA 35 circuit breaker is closed.

4. Apply power to the GTN 7XX.

5. Select all GMA 35 Boot Block updates.

6. Touch the Update key.

7. Touch OK.

8. Remove power from the GTN.

9. Remove power from the GMA 35.

10. Remove the Boot Block Loader Card.

11. Re-insert the database card in the data card slot.

12. Apply power to the GTN.

13. Apply power to the GMA 35.

14. Go to the System Information page.

15. Select GMA 35.

16. Make sure the software level matches what was on the GTN Boot Block Loader Card.

190-01007-B1 GTN 6XX/7XX Part 27 AML STC Maintenance Manual
Rev. 4 Page 3-6

3.3 GTN Configuration Mode Overview

NOTE

When configuring the GTN, ensure that no configuration module service messages are
displayed in the message queue. This indicates the configuration module is improperly
wired or damaged.

NOTE

The configuration pages shown reflect main software v6.70. Some differences in operation
may be observed when comparing information in this manual to later software versions.

Configuration mode is used to configure the GTN settings for each specific installation. To access
Configuration mode, perform the following steps:

1. Remove power from the GTN.

2. Press and hold the HOME key and reapply power to the GTN.

3. Release the HOME key when the display activates and the name “Garmin” appears fully lit on the
screen.

The first page displayed is the Configuration Mode page. For detailed information regarding how to
configure the GTN, refer to GTN 6XX/7XX Part 27 AML STC Installation Manual. While in Configuration
mode, pages can be selected by touching the necessary key on the display. Some pages may require page
scrolling to view all of the information and keys on the page. To scroll, touch the screen and drag the page
in the necessary direction or touch the Up or Down keys.

Figure 3-8 GTN 6XX and GTN 7XX Configuration Mode Pages

190-01007-B1 GTN 6XX/7XX Part 27 AML STC Maintenance Manual
Rev. 4 Page 3-7

3.3.1 GTN Software Updates

NOTE

The following steps need to be repeated for each GTN unit that requires a software update.

Figure 3-9 GTN 7XX Updates Page

To update the GTN software, perform the following steps:

1. Remove power from the GTN.

2. Remove the database card and insert the correct GTN Software Loader Card into the data card slot.
To create a GTN Software Loader Card, refer to Section 3.2.1.

3. Power up the GTN in Configuration mode.

4. Touch Updates.

5. Check that the software version being loaded into the GTN matches the software version listed on
Equipment List, GTN 6XX/7XX Part 27 AML STC (P/N 005-00533-H1). The Updates page
displays the version that is installed on the unit and the version installed on the loader card.

6. Check the available GTN software updates are being displayed by ensuring that the Updates key
is highlighted in the upper-left corner (upper-right corner for GTN 6XX) of the display.

7. Touch Select All.

8. Touch Updates.

9. Touch OK.

10. When completed, remove power from the GTN.

11. Remove the Software Loader Card.

12. Re-insert the database card into the data card slot.

190-01007-B1 GTN 6XX/7XX Part 27 AML STC Maintenance Manual
Rev. 4 Page 3-8

3.3.2 System Information

To view the System Information page, touch the System Information key on the Configuration Mode
page. The System Information page displays the unit type, serial number, and system ID for the GTN. It
also contains the software and hardware versions of the Main, I/O, Display, Keypad, LED, GPS/WAAS,
COM, and NAV boards. This information is also available for certain other LRUs connected to the GTN.
Touch the GTN key and choose which LRU to display. Touch Up or Down to view all the information.

Figure 3-10 System Information Page

190-01007-B1 GTN 6XX/7XX Part 27 AML STC Maintenance Manual
Rev. 4 Page 3-9

3.3.3 GTN Setup Page

A brief overview of the pages that are accessed from the GTN Setup page are described below. To access
the GTN Setup page, touch the GTN Setup key from the Configuration Mode page.

Figure 3-11 GTN 7XX GTN Setup Page

ARINC 429

The ARINC 429 page allows the user to configure the ARINC 429 input and output ports on the GTN.
Both ARINC 429 formats and bus speeds are set from this configuration page.

RS-232

The RS-232 page allows the user to configure the RS-232 input and output ports on the GTN.

HSDB (Ethernet)

The HSDB (Ethernet) page allows the user to set which Ethernet ports are connected.

Interfaced Equipment

The Interfaced Equipment page allows the user to configure which LRUs are installed and interfaced to
the GTN. The transponder selection is automatically configured when a valid transponder configuration is
selected under the RS-232 page.

Main Indicator (Analog)

The Main Indicator (Analog) page allows the user to calibrate the OBS resolver, configure the CDI key,
selected course for GPS, and VLOC, as well as the V-Flag state.

Lighting

The Lighting page allows the user to set the display parameters that affect the backlight and key lighting
brightness.

190-01007-B1 GTN 6XX/7XX Part 27 AML STC Maintenance Manual
Rev. 4 Page 3-10

Enhanced Lighting

The Enhanced Lighting page replaces the Lighting page when enabled under the Main System
configuration page. Enhanced lighting allows the user to set the display parameters that affect the backlight
and key lighting brightness. Enhanced lighting may be used to configure separate day/night lighting
curves.

Audio

The Audio page allows the user to configure the aural alert volume.

Traffic

The Traffic page allows the user to configure the traffic intruder symbol color and configure whether or
not the GTN is the display used to control the traffic system.

Main System

The Main System page allows the user to display miscellaneous configuration options for the GTN.
Options available are air/ground threshold, air/ground discrete, fuel type, and heading/altitude input source
connection statuses.

COM

The COM page allows the user to configure the RX squelch volume, microphone 1 gain, and sidetone
volume. These selections are only available for the GTN 635, 650, and 750 units.

VOR/LOC/GS

The VOR/LOC/GS page allows the user to check the CDI outputs from the VOR/LOC/GS receiver as well
as the OBS resolver input to the VOR receiver. This selection is only available for the GTN 650 and 750
navigation units.

Discretes

The Discretes page allows the user to customize the configuration of some discrete inputs/outputs on the
J1001 and J1002 connectors.

Navigation Features

The Navigation Features page provides the options to allow Mark On Target (MOT) waypoint filtering
and RF procedural legs in Normal mode, and to configure Vertical Navigation settings.

Ownship

The Ownship page allows the user to select the displayed ownship icon from a list.

Flight Stream

The Flight Stream page allows the user to configure settings for the Flight Stream 510. These settings are
not approved under this STC.

Update Config Module

The Update Config Module button allows the user to update the configuration module with the current
configuration settings.

190-01007-B1 GTN 6XX/7XX Part 27 AML STC Maintenance Manual
Rev. 4 Page 3-11