Garmin GTN 635 User manual

190-01004-02 January 2012 Rev. C

GTN 625/635/650 TSO Installation Manual Page A
190-01004-02 Rev. C
©Copyright 2011-2012
Garmin International Inc., or its subsidiaries
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RECORD OF REVISIONS
Revision
Revision Date
Description
A
2/8/11
Initial Release
B
4/27/11
Corrected plug number and added note 8 to Figure D-16.
Updated information in system functions Table 1-6. See
Current Revision Description for more details.
C
1/25/12
Added ETSO information and other minor edits. See Current
Revision Description for more details.

Page B GTN 625/635/650 TSO Installation Manual
Rev. C 190-01004-02
CURRENT REVISION DESCRIPTION
Section
Number
Description of Change
1.3.4.1
Updated modulation and frequency range of the COM transmitter.
1.3.4.2
Updated frequency range of the COM receiver.
1.5.1
Updated Table 1-4 with ETSO information.
1.5.3
Added deviations for ETSO-2C40c, ETSO-C118, ETSO-C146, and ETSO-C147.
2.1
Added, “To mitigate against the loss of navigation and communication, installation of
second navigation and/or communication system may be required.”
2.2
Added, “To meet requirements for Part 25, 27, and 29 aircraft, it is necessary to install a
second VHF communications radio.”
4.4
Deleted, “Connector, BNC, Male, Clamp” from section.
4.9
Changed 010-2042-000 to 030-2042-000 in Table 4-5.
5.1.2
Corrected figure of P1002 connector.
5.1.3
Corrected figure of P1003 connector.
5.1.4
Corrected figure of P1004 connector.
6.6.6.1
Changed range of photocell transition from 0 to 5.
6.9.5.4
Added, “The default value of 24 seconds is a nominal value for most aircraft. This value
can be changed depending on the types of operations the aircraft is expected to
encounter” to Auto Standby Delay information.
Added, ”This field should be set to the typical vertical speed climb rate of the aircraft.
This number determines the rate of climb necessary for the GTN to assume lift-off for
detecting an airborne state. Refer to the Pilot„s Operating Handbook (POH) to determine
this value. If the POH does not include aircraft climb rate information, use the default
value of 300 fpm” To Altitude Climb Rate for Airborne Transition information.
Appendix C
Updated Backplate Kit Content Differences in Figure C-2.
Appendix D
Figure D-2, D-3 and D-4: Added fan.
Figure D-5: Simplified entire figure.
Figure D-9: Changed interconnect to illustrate wiring for single/dual GTNs to single/dual
transponders, with and without TIS.
Figure D-24: Deleted
Figure D-25: Added SUSPEND ANNUNCIATE discrete and note 6.
DOCUMENT PAGINATION
Section
Pagination
Table of Contents
i - viii
Section 1
1-1 through 1-20
Section 2
2-1 through 2-2
Section 3
3-1 through 3-12
Section 4
4-1 through 4-10
Section 5
5-1 through 5-24
Section 6
6-1 through 6-52
Section 7
7-1 through 7-2
Appendix A
A-1 through A-2
Appendix B
B-1 through B-10
Appendix C
C-1 through C-8
Appendix D
D-1 through D-40

GTN 625/635/650 TSO Installation Manual Page i
190-01004-02 Rev. C
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.
WARNING
This product, its packaging, and its components contain chemicals known to the State of
California to cause cancer, birth defects, or reproductive harm. This notice is being
provided in accordance with California's Proposition 65. If you have any questions or
would like additional information, please refer to our web site at
www.garmin.com/prop65.
WARNING
Perchlorate Material –special handling may apply, See
www.dtsc.ca.gov./hazardouswaste/perchlorate.
WARNING
This product contains a lithium battery that must be recycled or disposed of properly.
Battery replacement and removal must be performed by professional services.
CAUTION
To avoid damage to the GTN, take precautions to prevent Electro-Static Discharge (ESD)
when handling the GTN, connectors, fan, and associated wiring. ESD damage can be
prevented by touching an object that is of the same electrical potential as the GTN before
handling the GTN itself.
CAUTION
The GTN 625, GTN 635 and GTN 650 has a display that is coated with a special anti-
reflective coating and is very sensitive to waxes and abrasive cleaners. CLEANERS
CONTAINING AMMONIA WILL HARM THE ANTI-REFLECTIVE COATING. It is
very important to clean the display using a microfiber cloth or with a clean, lint-free cloth
and an eyeglass lens cleaner that is safe for anti-reflective coatings.

Page ii GTN 625/635/650 TSO Installation Manual
Rev. C 190-01004-02
1. GENERAL DESCRIPTION............................................................................................................1-1
1.1 Introduction ..............................................................................................................................1-1
1.2 Equipment Description.............................................................................................................1-1
1.3 Technical Specifications...........................................................................................................1-2
1.3.1 Physical Characteristics........................................................................................................1-2
1.3.2 General Specifications..........................................................................................................1-2
1.3.3 GTN GPS/SBAS Specifications...........................................................................................1-3
1.3.4 COM Specifications (GTN 635/650 Only)..........................................................................1-4
1.3.5 VOR Specifications (GTN 650 Only)..................................................................................1-5
1.3.6 LOC Specifications (GTN 650 Only) ..................................................................................1-5
1.3.7 Glideslope Specifications (GTN 650 Only).........................................................................1-6
1.3.8 GPS/WAAS Antenna Requirements....................................................................................1-7
1.4 License Requirements...............................................................................................................1-8
1.5 Regulatory Compliance............................................................................................................1-9
1.5.1 TSO Authorization and Advisory Circular References........................................................1-9
1.5.2 Non-TSO Functions ...........................................................................................................1-10
1.5.3 TSO Deviations..................................................................................................................1-12
1.5.4 FCC Grant of Equipment Authorization ............................................................................1-14
1.5.5 AFM/AFMS/POH Considerations.....................................................................................1-14
1.6 GTN Databases.......................................................................................................................1-18
1.6.1 Basemap Database .............................................................................................................1-18
1.6.2 Navigation Database ..........................................................................................................1-18
1.6.3 FliteCharts®Database ........................................................................................................1-18
1.6.4 ChartView™ Database.......................................................................................................1-19
1.6.5 SafeTaxi®Database............................................................................................................1-19
1.6.6 Terrain Database ................................................................................................................1-19
1.6.7 Obstacle Database..............................................................................................................1-19
1.7 Fault Detection and Exclusion (FDE) ....................................................................................1-19
1.8 Aviation Limited Warranty ....................................................................................................1-20
2. LIMITATIONS................................................................................................................................2-1
2.1 Installation................................................................................................................................2-1
2.1.1 GPS Antenna........................................................................................................................2-1
2.2 Aircraft Radio...........................................................................................................................2-1
3. INSTALLATION OVERVIEW ......................................................................................................3-1
3.1 Introduction ..............................................................................................................................3-1
3.2 Minimum System Configuration..............................................................................................3-1
3.2.1 VFR Installation...................................................................................................................3-1
3.2.2 IFR GPS Installation in Reciprocating, Single-Engine Aircraft 6000 lbs or Less ...............3-1
3.2.3 IFR GPS Plus VOR/LOC/GS Installation............................................................................3-2
3.3 External Sensors.......................................................................................................................3-2
3.3.1 Multiple Uncorrected Pressure Altitude Sources.................................................................3-2
3.3.2 Multiple Baro-Corrected Altitude Sources...........................................................................3-3
3.3.3 Multiple Heading Sources....................................................................................................3-3
3.3.4 Multiple Indicated Airspeed Sources...................................................................................3-4
3.3.5 Multiple True Airspeed Sources ..........................................................................................3-4
3.3.6 Multiple VLOC Selected Course Sources............................................................................3-4
3.3.7 GPS Selected Course Sources..............................................................................................3-5
3.3.8 Total Air Temperature Sources............................................................................................3-5
3.3.9 Static Air Temperature Sources ...........................................................................................3-5
3.4 Antenna Considerations............................................................................................................3-6
3.4.1 GPS Antenna Location.........................................................................................................3-6

GTN 625/635/650 TSO Installation Manual Page iii
190-01004-02 Rev. C
3.4.2 COM Antenna Location.......................................................................................................3-7
3.4.3 VOR/LOC Antenna Location...............................................................................................3-9
3.4.4 Glideslope Antenna Location...............................................................................................3-9
3.4.5 Electrical Bonding................................................................................................................3-9
3.4.6 Interference of GPS..............................................................................................................3-9
3.5 GTN 625/635/650 Mounting Considerations.........................................................................3-10
3.6 Cabling and Wiring Considerations .......................................................................................3-10
3.7 Air Circulation and Cooling ...................................................................................................3-11
3.8 Compass Safe Distance ..........................................................................................................3-11
4. INSTALLATION PROCEDURES..................................................................................................4-1
4.1 Unit and Accessories................................................................................................................4-1
4.2 Optional Accessories................................................................................................................4-2
4.2.1 GPS Antenna Options ..........................................................................................................4-2
4.3 Database Options......................................................................................................................4-3
4.4 Miscellaneous Options .............................................................................................................4-3
4.5 Optional Reference Material ....................................................................................................4-3
4.6 Enablement Cards.....................................................................................................................4-3
4.7 Installation Materials Required but not Supplied.....................................................................4-4
4.7.1 Accessories Required but not Supplied................................................................................4-4
4.7.2 Materials Required but not Supplied (New Installations Only)...........................................4-4
4.7.3 Optional Annunciation Panels..............................................................................................4-5
4.8 Special Tools Required.............................................................................................................4-5
4.9 Coaxial Cable Installation ........................................................................................................4-6
4.10 Equipment Mounting................................................................................................................4-8
4.10.1 Rack Installation...................................................................................................................4-8
4.10.2 GTN Unit Insertion and Removal........................................................................................4-8
4.10.3 Unit Replacement.................................................................................................................4-8
4.11 Antenna Installation and Connections......................................................................................4-9
4.11.1 GPS Antenna........................................................................................................................4-9
4.11.2 COM Antenna (GTN 650 Only) ........................................................................................4-10
4.11.3 NAV Antenna (GTN 650 Only).........................................................................................4-10
5. CONNECTOR PINOUT INFORMATION.....................................................................................5-1
5.1 Pin Function List ......................................................................................................................5-1
5.1.1 P1001 Main Connector –Main Board .................................................................................5-1
5.1.2 P1002 Connector..................................................................................................................5-3
5.1.3 P1003 COM Connector........................................................................................................5-4
5.1.4 P1004 NAV Connector ........................................................................................................5-5
5.2 Power, Lighting, And Antennas ...............................................................................................5-7
5.2.1 Power....................................................................................................................................5-7
5.2.2 Lighting Bus.........................................................................................................................5-7
5.2.3 Antennas...............................................................................................................................5-8
5.2.4 Serial Data............................................................................................................................5-8
5.2.5 Ethernet (HSDB)................................................................................................................5-12
5.2.6 Main Audio Output ............................................................................................................5-12
5.2.7 Main Indicator....................................................................................................................5-12
5.2.8 OBS....................................................................................................................................5-13
5.2.9 Discrete Inputs ...................................................................................................................5-14
5.2.10 Discrete Outputs.................................................................................................................5-15
5.2.11 TIME MARK OUT............................................................................................................5-18
5.2.12 COM Audio (GTN 650 Only)............................................................................................5-19
5.2.13 COM Discrete Inputs (GTN 650 Only)..............................................................................5-20
5.2.14 VOR/ILS Audio (GTN 650 Only) .....................................................................................5-20

Page iv GTN 625/635/650 TSO Installation Manual
Rev. C 190-01004-02
5.2.15 VOR/ILS Discrete Inputs (GTN 650 Only).......................................................................5-21
5.2.16 VOR/ILS Indicator (GTN 650 Only).................................................................................5-21
5.2.17 RMI/OBI (GTN 650 Only) ................................................................................................5-23
5.2.18 DME Tuning (GTN 650 Only)...........................................................................................5-24
6. POST INSTALLATION CONFIGURATION AND CHECKOUT PROCEDURES.....................6-1
6.1 System Configuration Overview ..............................................................................................6-1
6.2 Mounting, Wiring, and Power Checks .....................................................................................6-1
6.3 Connector Engagement Check .................................................................................................6-2
6.4 Configuration Mode Operations...............................................................................................6-2
6.5 System Information Page..........................................................................................................6-2
6.6 GTN Setup Page.......................................................................................................................6-3
6.6.1 ARINC 429 Configuration Page..........................................................................................6-3
6.6.2 RS-232 Configuration Page .................................................................................................6-7
6.6.3 HSDB (Ethernet) Configuration Page..................................................................................6-9
6.6.4 Interfaced Equipment Page ..................................................................................................6-9
6.6.5 Main Indicator (Analog) Configuration Page ....................................................................6-10
6.6.6 Lighting Configuration Page..............................................................................................6-11
6.6.7 Audio Configuration Page..................................................................................................6-12
6.6.8 Traffic Configuration Page.................................................................................................6-13
6.6.9 Main System Configuration Page ......................................................................................6-13
6.6.10 COM Configuration Page (GTN 650 Only).......................................................................6-14
6.6.11 VOR/LOC/GS Configuration Page (650 Only) .................................................................6-15
6.7 GTN Options Page .................................................................................................................6-16
6.7.1 TAWS Configuration Page (For TAWS Units Only)........................................................6-16
6.7.2 COM Transmit Power Configuration Page........................................................................6-17
6.8 GTN Diagnostics Page ...........................................................................................................6-18
6.8.1 ARINC Inputs Page............................................................................................................6-18
6.8.2 Serial Inputs Page...............................................................................................................6-18
6.8.3 Discrete Pages....................................................................................................................6-18
6.8.4 HSDB (Ethernet) Page .......................................................................................................6-18
6.8.5 Main Indicator (Analog) Diagnostics Page........................................................................6-18
6.8.6 Analog Inputs Page ............................................................................................................6-19
6.8.7 Power Statistics Page .........................................................................................................6-19
6.8.8 WAAS Diagnostics Page ...................................................................................................6-19
6.8.9 Temperatures Page.............................................................................................................6-19
6.8.10 Error Log Page...................................................................................................................6-19
6.8.11 Main Data Inputs Page.......................................................................................................6-19
6.8.12 VOR/ILS Indicator (Analog) Page.....................................................................................6-19
6.9 External Systems ....................................................................................................................6-20
6.9.1 GDL 69/69A Interface Check ............................................................................................6-20
6.9.2 Stormscope®Page ..............................................................................................................6-21
6.9.3 Traffic Test Page................................................................................................................6-22
6.9.4 GAD 42 Configuration.......................................................................................................6-22
6.9.5 Remote Transponder Configuration...................................................................................6-23
6.10 Ground Checks (Configuration Mode)...................................................................................6-32
6.10.1 Main Indicator Check (Analog Only) ................................................................................6-32
6.10.2 VOR/ILS Indicator (Analog) Diagnostics..........................................................................6-32
6.10.3 Discrete Inputs Checkout ...................................................................................................6-33
6.10.4 Discrete Outputs Checkout.................................................................................................6-33
6.10.5 HSDB Provisional Wiring Checkout .................................................................................6-33
6.10.6 Crossfill Check (If Dual GTNs Installed)..........................................................................6-34
6.10.7 TAWS Audio Check (For Units with TAWS Only)..........................................................6-34

GTN 625/635/650 TSO Installation Manual Page v
190-01004-02 Rev. C
6.10.8 GAD 42 Interface Check....................................................................................................6-35
6.10.9 Lighting Bus Interface Check ............................................................................................6-35
6.10.10 Altitude Encoder or Air Data Computer Check.................................................................6-36
6.10.11 AHRS/IRU Interface Check...............................................................................................6-36
6.11 Ground Checks (Normal Mode).............................................................................................6-37
6.11.1 Display of Self-Test Data...................................................................................................6-37
6.11.2 Signal Acquisition Check...................................................................................................6-38
6.11.3 VHF COM Interference Check ..........................................................................................6-38
6.11.4 VHF NAV Checkout (GTN 650 Only)..............................................................................6-40
6.11.5 VHF COM Checkout (GTN 650 Only)..............................................................................6-40
6.11.6 TAWS System Check (For Units with TAWS Only) ........................................................6-40
6.12 Interface Checkout..................................................................................................................6-41
6.12.1 Honeywell (Bendix/King) EFS40/50 Interface Check.......................................................6-41
6.12.2 Sandel SN 3308 Interface Check .......................................................................................6-41
6.12.3 EHSI Deviation Scaling (If HSI/CDI Is Driven by the GTN Via Serial Data)..................6-44
6.12.4 ARINC 429 Traffic System Interface Check.....................................................................6-45
6.12.5 Stormscope®Interface Check.............................................................................................6-45
6.12.6 GMX 200/MX20 Interface Check......................................................................................6-45
6.12.7 GDL 69/69A Interface Check ............................................................................................6-45
6.12.8 VOR RMI/OBI Interface Check (650 Only)......................................................................6-46
6.12.9 DME Interface Check (GTN 650 Only).............................................................................6-46
6.12.10 Magnetic Compass Check..................................................................................................6-46
6.13 Flight Checks..........................................................................................................................6-47
6.13.1 GPS Flight Check...............................................................................................................6-47
6.13.2 VHF COM Flight Check (GTN 650) .................................................................................6-47
6.13.3 VOR Flight Check (GTN 650)...........................................................................................6-47
6.13.4 ILS Flight Check (GTN 650) .............................................................................................6-48
6.13.5 Autopilot Flight Check.......................................................................................................6-48
6.13.6 TAWS Audio Flight Check (TAWS-equipped units only)................................................6-48
6.14 Database Check ......................................................................................................................6-48
6.15 Data Card Replacement..........................................................................................................6-49
6.16 Software Loading ...................................................................................................................6-49
6.16.1 Creating a GTN Software Loader Card..............................................................................6-49
6.16.2 GTN Software Loading......................................................................................................6-50
6.17 Documentation Checks...........................................................................................................6-51
6.17.1 Airplane Flight Manual Supplement..................................................................................6-51
7. PERIODIC MAINTENANCE.........................................................................................................7-1
7.1 Equipment Calibration..............................................................................................................7-1
7.2 VOR Checks.............................................................................................................................7-1
7.3 Cleaning....................................................................................................................................7-1
7.4 Battery Replacement.................................................................................................................7-1
Appendix A ENVIRONMENTAL QUALIFICATION FORM..........................................................A-1
Appendix B GTN DATA FORMAT ..................................................................................................B-1
B.1 RS-232 Aviation Data Format.................................................................................................B-1
B.1.1 Electrical Interface...................................................................................................................B-1
B.1.2 General Output Format............................................................................................................B-1
B.1.3 Output Sentence Type 1 ..........................................................................................................B-1
B.1.4 Output Sentence Type 2 ..........................................................................................................B-3
B.2 GTN RS-232 FUEL/AIR DATA INPUT FORMAT ..............................................................B-5
B.2.1 Electrical Interface...................................................................................................................B-5
B.2.2 Shadin Altitude Sentence.........................................................................................................B-5
B.2.3 Icarus Altitude Sentence..........................................................................................................B-5

Page vi GTN 625/635/650 TSO Installation Manual
Rev. C 190-01004-02
B.2.4 Shadin Fuel Flow Sentence .....................................................................................................B-6
B.2.5 ARNAV/EI Fuel Flow Sentence .............................................................................................B-6
B.2.6 Shadin Fuel/Air Data Computer Sentence...............................................................................B-7
Appendix C MECHANICAL DRAWINGS .......................................................................................C-1
C.1 Drawing List............................................................................................................................C-1
Appendix D INTERCONNECT DIAGRAMS....................................................................................D-1
D.1 Drawing List............................................................................................................................D-1
LIST OF FIGURES
Figure 3-1. GPS Antenna Installation Considerations..............................................................................3-8
Figure 4-1. Coaxial Cable Installation......................................................................................................4-6
Figure 6-1. Configuration Mode Page ......................................................................................................6-2
Figure 6-2. System Information Page ........................................................................................................6-2
Figure 6-3. GTN Setup Page.....................................................................................................................6-3
Figure 6-4. ARINC 429 Configuration Page ............................................................................................6-3
Figure 6-5. RS-232 Configuration Page ...................................................................................................6-7
Figure 6-6. HSDB Port Utilization Page...................................................................................................6-9
Figure 6-7. Interfaced Equipment Page ....................................................................................................6-9
Figure 6-8. Main Indicator (Analog) Configuration Page ......................................................................6-10
Figure 6-9. Lighting Configuration Page................................................................................................6-11
Figure 6-10. Photocell Configuration Page.............................................................................................6-11
Figure 6-11. Lighting Bus Configuration Page.......................................................................................6-12
Figure 6-12. Audio Configuration Page..................................................................................................6-12
Figure 6-13. Select Test Sound Page ......................................................................................................6-12
Figure 6-14. Traffic Configuration Page.................................................................................................6-13
Figure 6-15. Main System Configuration Page ......................................................................................6-13
Figure 6-16. Measurement of GPS Antenna Vertical Offset..................................................................6-14
Figure 6-17. COM Configuration Page...................................................................................................6-14
Figure 6-18. VOR/LOC/GS Configuration Page....................................................................................6-15
Figure 6-19. GTN Options Page .............................................................................................................6-16
Figure 6-20. TAWS Configuration Page ................................................................................................6-16
Figure 6-21. Configure TAWS Audio Page............................................................................................6-17
Figure 6-22. COM Transmit Power Configuration Page........................................................................6-17
Figure 6-23. GTN Diagnostics Page.......................................................................................................6-18
Figure 6-24. External Systems Page .......................................................................................................6-20
Figure 6-25. GDL 69/69A Configuration Page ......................................................................................6-20
Figure 6-26. Stormscope Page ................................................................................................................6-21
Figure 6-27. Stormscope Configuration Page.........................................................................................6-21
Figure 6-28. Stormscope Test Page ........................................................................................................6-21
Figure 6-29. Stormscope Test Menu Page..............................................................................................6-21
Figure 6-30. Traffic Test Page................................................................................................................6-22
Figure 6-31. GAD 42 Configuration Page..............................................................................................6-22
Figure 6-32. XPDR Configuration Page.................................................................................................6-23
Figure 6-33. XPDR Input/Outputs Page .................................................................................................6-23
Figure 6-34. Remote XPDR Configuration Page....................................................................................6-28
Figure 6-35. Microsoft Windows Calculator ..........................................................................................6-30
Figure 6-36. XPDR Audio Configuration Page......................................................................................6-31
Figure 6-37. Main Indicator (Analog) Diagnostics Page........................................................................6-32
Figure 6-38. VOR/ILS Indicator (Analog) Diagnostics Page..................................................................6-32
Figure 6-41. HSDB Port Status Page......................................................................................................6-33
Figure 6-39. Discrete Inputs Page...........................................................................................................6-33
Figure 6-40. Discrete Outputs Page........................................................................................................6-33
Figure 6-42. Audio Configuration Page..................................................................................................6-34

GTN 625/635/650 TSO Installation Manual Page vii
190-01004-02 Rev. C
Figure 6-43. GAD 42 Configuration Page..............................................................................................6-35
Figure 6-44. Lighting Configuration Page..............................................................................................6-35
Figure 6-45. Main Data Inputs Page.......................................................................................................6-36
Figure 6-46. Updates Page......................................................................................................................6-50
Figure C-1. GTN 625/635/650 CG and Mounting Rack Dimensions .....................................................C-3
Figure C-3. GTN 625/635/650 Recommended Panel Cutout Dimensions..............................................C-5
Figure C-4. GTN 625/635/650 Mounting Rack and Tab Alignment Detail............................................C-6
Figure C-5. GTN 6XX Connector Layout Detail –Rear View ...............................................................C-7
Figure D-1. GTN System Interface Diagram...........................................................................................D-3
Figure D-2. GTN 650 Typical Installation...............................................................................................D-4
Figure D-3. GTN 625 Typical Installation...............................................................................................D-6
Figure D-4. GTN 6XX Power Lighting Configuration Interconnect.......................................................D-8
Figure D-5. GTN 6XX –Antenna Interconnect.......................................................................................D-9
Figure D-6. GTN 6XX –Main Indicator Interconnect ..........................................................................D-12
Figure D-7. GTN 6XX - Autopilot Interconnect ...................................................................................D-13
Figure D-8. GTN 6XX - Traffic Interconnect........................................................................................D-14
Figure D-9. GTN 6XX –Transponder Interconnect..............................................................................D-15
Figure D-10. Dual GTN to Single GDU Interconnect...........................................................................D-19
Figure D-11. GTN 6XX - ARINC 429 EFIS Interconnect....................................................................D-20
Figure D-12. GTN - GDL 69/69A Interconnect ....................................................................................D-22
Figure D-13. Audio Panel Interconnect.................................................................................................D-23
Figure D-14. GTN 6XX - Air Data/IRU/AHRS RS-232 Interconnect..................................................D-25
Figure D-15. GTN 6XX - Air Data/IRU/AHRS ARINC 429 Interconnect...........................................D-27
Figure D-16. GTN 6XX - GAD 42 Interconnect...................................................................................D-28
Figure D-17. VOR/ILS Indicator Interconnect......................................................................................D-29
Figure D-18. GTN - RMI OBI Interconnect..........................................................................................D-30
Figure D-19. GTN 6XX –WX-500 Interconnect..................................................................................D-31
Figure D-20. GTN 650 - DME Interconnect..........................................................................................D-32
Figure D-21. GTN 650 –Remote DME Interconnect............................................................................D-33
Figure D-22. Parallel 2 of 5 DME Tuning.............................................................................................D-34
Figure D-23. Parallel Slip Code DME Tuning Interconnect..................................................................D-35
Figure D-24. Reserved...........................................................................................................................D-36
Figure D-25. GPS Annunciator Interconnect.........................................................................................D-37
Figure D-26. NAV Source Select Annunciator Interconnect.................................................................D-38
Figure D-27. TAWS Interconnect..........................................................................................................D-39
Figure D-28. Switches Interconnect.......................................................................................................D-40
LIST OF TABLES
Table 1-1. GTN Units ...............................................................................................................................1-1
Table 1-2. GTN Current Specifications....................................................................................................1-6
Table 1-3. Approved GPS/SBAS Antennas..............................................................................................1-7
Table 1-4. TSO Authorization ..................................................................................................................1-9
Table 1-5. Non-TSO Functions...............................................................................................................1-10
Table 1-6. System Functions...................................................................................................................1-11
Table 4-1. Catalog Part Numbers..............................................................................................................4-1
Table 4-2. Standard Kit Accessories.........................................................................................................4-1
Table 4-3. Replacement Fan Parts ............................................................................................................4-1
Table 4-4. Recommended Crimp Tools (or Equivalent)...........................................................................4-5
Table 4-5. Socket Contact Part Numbers..................................................................................................4-7
Table B-1. Type 1 Output Sentence Format ............................................................................................B-2
Table B-2. Type 2 Output Sentence Format ............................................................................................B-4

Page viii GTN 625/635/650 TSO Installation Manual
Rev. C 190-01004-02
GTN 625/635/650 HARDWARE MOD LEVEL HISTORY
The following table identifies hardware modification (Mod) Levels for the GTN 625, GTN 635, and
GTN 650. Mod Levels are listed with the associated service bulletin number, service bulletin date, and
the purpose of the modification. The table is current at the time of publication of this manual (see date on
front cover) and is subject to change without notice. Authorized Garmin Sales and Service Centers are
encouraged to access the most up-to-date bulletin and advisory information on the Garmin Dealer
Resource web site at www.garmin.com using their Garmin-provided user name and password.
Mod Level
Service Bulletin
Number
Service Bulletin
Date
Purpose of Modification

GTN 625/635/650 TSO Installation Manual Page 1-1
190-01004-02 Rev. C
1. GENERAL DESCRIPTION
1.1 Introduction
This manual is applicable for units with main software version 2.00 or later. This manual describes the
physical, mechanical, and electrical characteristics, as well as instructions and other conditions and
limitations for installation and approval of the GTN units. Refer to Section 2, Limitations, for additional
information and other considerations. NOTE
Except where specifically noted, references made to GTN will equally apply to the
GTN 625, GTN 635, and GTN 650. 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.
Table 1-1. GTN Units
Model
Part Number
Color
GTN 625
010-00811-00
BLACK
GTN 635
010-00812-00
BLACK
GTN 650
010-00813-00
BLACK
010-00889-00
GRAY
1.2 Equipment Description
The GTN 625 is a GPS/SBAS unit and may be approved for IFR en route, terminal, non-precision, and
precision approach operations. The GTN 625 meets the requirements of the TSO specified in Table 1-4.
The GTN 635 includes all of the features of the GTN 625 in addition to an airborne VHF communications
transceiver. The GTN 635 meets the requirements of the TSO specified in Table 1-4.
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. The GTN 650 meets the
requirements of the TSO specified in Table 1-4.
CAUTION
The GTN has a display that is coated with a special anti-reflective coating that is very
sensitive to waxes and abrasive cleaners. CLEANERS CONTAINING AMMONIA
WILL HARM THE ANTI-REFLECTIVE COATING. It is very important to clean the
display using a clean, lint-free cloth and an eyeglass lens cleaner that is specified as safe
for anti-reflective coatings.
CAUTION
The use of ground-based cellular telephones while aircraft are airborne is prohibited by
FCC rules. Due to potential interference with onboard systems, the use of ground-based
cell phones while the aircraft is on the ground is subject to FAA regulation 14
CFR §91.21. FCC regulation 47 CFR §22.925 prohibits airborne operation of ground-
based cellular telephones installed in or carried aboard aircraft. Ground-based cellular
telephones must not be operated while aircraft are off the ground. When any aircraft
leaves the ground, all ground-based cellular telephones on board that aircraft must be
turned off. Ground-based cell phones that are on, even in a monitoring state, can disrupt
GPS/SBAS performance.

Page 1-2 GTN 625/635/650 TSO Installation Manual
Rev. C 190-01004-02
1.3 Technical Specifications
1.3.1 Physical Characteristics
Characteristics
Specifications
Bezel Height
2.65 in. (67 mm)
Bezel Width
6.25 in. (159 mm)
Rack Height (Dimple-to-Dimple)
2.665 in. (68 mm)
Rack Width
6.300 in (160 mm)
Depth Behind Panel with Connectors (Measured from
face of aircraft panel to rear of connector backshells)
11.25 in. (286 mm)
GTN 625 Weight (Unit only)
4.2 lb (1.90 kg)
GTN 625 Weight (Installed with rack and connectors)
5.4 lb (2.48 kg)
GTN 635 Weight (Unit only)
4.8 lb (2.18 kg)
GTN 635 Weight (Installed with rack and connectors)
6.2 lb (2.82 kg)
GTN 650 Weight (Unit only)
5.5 lb (2.48 kg)
GTN 650 Weight (Installed with rack and connectors)
7.0 lb (3.20 kg)
1.3.2 General Specifications
Characteristics
Specifications
Operating Temperature Range
-20 C to +55 C. For more details see
Environmental Qualification Form on the
Dealers Only page on www.garmin.com. See
Appendix A for part numbers.
Humidity
95% non-condensing
Altitude Range
-1,500 ft to 50,000 ft
Input Voltage Range - All Units (Main Connector)
11 to 33 VDC
Input Voltage Range (COM Connector on GTN 650)
11 to 33 VDC
GTN Current Draw
Refer to Table 1-2
Superflag Power Requirements
320 mA maximum per superflag output
Environmental Testing
See Environmental Qualification Form on the
Dealers Only page on www.garmin.com. See
Appendix A for part numbers.
The display on the GTN is a sunlight readable LCD display.
Characteristics
Specifications
Display Size
4.9 inch diagonal
Active Area
4.46 inches (W) x 1.98 inches (H)
Resolution
600 x 708 pixels
Viewing Angle
Left: 45
Right: 35°
Up: 10
Down: 30

GTN 625/635/650 TSO Installation Manual Page 1-3
190-01004-02 Rev. C
1.3.3 GTN GPS/SBAS Specifications
Characteristics
Specifications
Number Of Channels
15 (12 GPS and 3 GPS/WAAS/SBAS)
Frequency
1575.42 MHz L1, C/A code
Sensitivity (Acquisition, No Interference)
-134.5 dBm GPS
-135.5 dBm WAAS
Sensitivity (Drop Lock)
-144 dBm
Dynamic Range
> 20 dB
Lat/Lon Position Accuracy
<1.25 meter RMS horizontal, <2 meter vertical, with WAAS
Velocity
1000 knots maximum (above 60,000 ft)
TTFF (Time To First Fix)
1:45 min. typical with current almanac, position, and time
Reacquisition
10 seconds typical
Position Update Interval
0.2 sec (5 Hz)
1 PPS (Pulse Per Second)
275 Nsec of UTC second
Datum
WGS-84
SATCOM Compatibility
SATCOM compatibility is dependent upon antenna selection.
Antenna Power Supply
35 mA typical, 40 mA max at 4.7 VDC

Page 1-4 GTN 625/635/650 TSO Installation Manual
Rev. C 190-01004-02
1.3.4 COM Specifications (GTN 635/650 Only)
1.3.4.1 COM Transmitter Specifications
Characteristics
Specifications
Classes
3, 4, 5, 6
Microphone Input
Two inputs, standard carbon or dynamic mic with integrated
preamp providing minimum 70 mVRMS into 1000 load
Modulation Capability
85% with 100 to 1000 mVRMS microphone input at 1000 Hz
Modulation
AM double-sided
Emission Designator: 6K00A3E (118 –136.975 MHz)
5K60A3E (118 –136.992 MHz)
Frequency Range
118.000 to 136.975 MHz, 25 kHz channel spacing
118.000 to 136.992 MHz, 8.33 kHz channel spacing
Frequency Tolerance
+/-2ppm from -40°C to +70°C
Output Power
10 Watt Mode: 10 watts minimum
16 Watt Mode: 16 watts minimum
Duty Cycle
100%
16W: Recommended 25% (5 seconds on/15 seconds off,
15 seconds on/45 seconds off, etc.)
Carrier Noise Level
At least 35 dB (SNR).
Stuck Mic Time-Out
30 seconds time-out, reverts to receive
Demodulated Audio Distortion
Less than 5% distortion when the transmitter is at 85%
modulation at 350 to 2500 Hz
Sidetone
1.4 Vrms into a 500 load
1.3.4.2 COM Receiver Specifications
Characteristics
Specifications
Classes
C and E
Frequency Range
118.000 to 136.975 MHz, 25 kHz channel spacing
118.000 to 136.992 MHz, 8.33 kHz channel spacing
Headset Audio Output
100 mW minimum into a 500 load
Audio Response
Less than 6 dB of variation between 350 and 2500 Hz.
Audio Distortion
Less than 5% at rated output power
AGC Characteristics
Less than 3 dB of variation in the audio output from -93 to -13
dBm (power absorbed by a 50 load)
Sensitivity
SINAD on all channels is greater than 6 dB when the RF level is
2 uV (hard) or -107 dBm (power absorbed by a 50 load)
modulated 30% at 1000 Hz at rated audio output power
Squelch
Automatic squelch with manual override
Selectivity
6 dB BW is greater than +7 kHz for 25 kHz channeling.
60 dB BW is less than ±22 kHz for 25 kHz channeling.
6 dB BW is greater than ±3.5 kHz for 8.33 kHz channeling.
60 dB BW is less than ±7.37 kHz for 8.33 kHz channeling.

GTN 625/635/650 TSO Installation Manual Page 1-5
190-01004-02 Rev. C
1.3.5 VOR Specifications (GTN 650 Only)
Characteristics
Specifications
Receiver Audio Sensitivity
At -103.5 dBm (S+N)/N is not less than 6 dB.
Course Deviation Sensitivity
-103.5 dBm or less for 60% of standard deflection.
Flag
The VOR Course Deviation Flag must be flagged when:
RF signals are absent.
9960 Hz modulation is absent.
either one of the two 30 Hz modulations are absent.
the level of a standard VOR deviation test signal produces
less than a 50% of standard deflection.
AGC Characteristics
From -99 dBm to -13 dBm input of a Standard VOR Audio Test
Signal, audio output level does not vary more than 3 dB.
Spurious Response
Greater than 60 dB.
VOR OBS Bearing Accuracy
The bearing information as presented to the pilot does not have an
error in excess of 2.7° as specified by RTCA DO-196 and EuroCAE
ED-22B.
Audio Output
A minimum 100 mW into a 500 load.
Audio Response
Less than 6 dB of variation between 350 and 2500 Hz. In voice
mode, an IDENT tone of 1020 Hz Ident Tone is attenuated at least
20 dB down.
Audio Distortion
The distortion in the receiver audio output does not exceed 10% at
all levels up to 100 mW.
Selectivity
6 dB BW is greater than 16.5 kHz. 69 dB BW is less than 36 kHz.
1.3.6 LOC Specifications (GTN 650 Only)
Characteristics
Specifications
Receiver Audio Sensitivity
At -103.5 dBm (S+N)/N is not less than 6 dB.
Course Deviation Sensitivity
At -103.5 dBm, deviation output is not to be less than 60% of
standard deflection when a LOC deviation test signal is applied.
Flag
The VOR/LOC Course Deviation Flag is flagged when:
RF signals are absent.
9960 Hz modulation is absent.
one of the two 30 Hz modulations is absent.
the level of a standard VOR deviation test signal produces
less than a 50% of standard deflection.
AGC Characteristics
From -99 dBm to -13 dBm input of a Standard VOR Audio Test
Signal, audio output level does not vary more than 3 dB.
Selectivity
6 dB BW is greater than 9 kHz
69 dB BW is less than 36 kHz
Standard Deflection
With a standard deflection ‘FLY LEFT’ condition (90 Hz dominant),
the output is +90 mV ± 9 mV.
With a standard deflection ‘FLY RIGHT’ condition (150 Hz
dominant), the output is -90 mV ± 9 mV.
Spurious Response
Greater than 60 dB.
VOR OBS Bearing Accuracy
The bearing information as presented to the pilot does not have an
error in excess of 2.7° as specified by RTCA DO-196 and EuroCAE
ED-22B.
Audio Output
A minimum 100 mW into a 500 load.
Audio Response
Less than 6 dB of variation between 350 and 2500 Hz. In voice
mode, an IDENT tone of 1020 Hz Ident Tone is attenuated at least
20 dB down.
Audio Distortion
The distortion in the receiver audio output does not exceed 10% at
all levels up to 100 mW.

Page 1-6 GTN 625/635/650 TSO Installation Manual
Rev. C 190-01004-02
1.3.7 Glideslope Specifications (GTN 650 Only)
Characteristics
Specifications
Sensitivity
-87 dBm or less for 60% of standard deflection.
Centering Accuracy
0 ±0.01183 ddm or 0 ±10.14 mV
Selectivity
The course deviation is 0 ddm .0091 ddm when using the Glideslope
Centering Test Signal as the RF frequency is varied 17 kHz from the
assigned channel.
At frequencies displaced by 132 kHz or greater, the input signal is at
least 60 dB down.
Standard Deflection
With a standard deflection „FLY DOWN‟ condition (90 Hz dominant),
the output is -78 mV ±7.8 mV.
With a standard deflection „FLY UP‟ condition (150 Hz dominant), the
output is +78 mV ±7.8 mV.
Flag
The unit flags when:
the level of a standard VOR deviation test signal produces
50% or less of standard deflection of the deviation indicator.
150 Hz modulation is absent.
90 Hz modulation is absent.
90 Hz and 150 Hz modulations are both absent.
RF signals are absent.
Table 1-2. GTN Current Specifications
LRU
14 Volt Current Draw
28 Volt Current Draw
Typical
Maximum
Typical
Maximum
GTN 625
Main Connector
1.6 A [1]
2.8 A [2]
0.8 A [1]
1.5 A [2]
GTN 635
Main Connector
1.6 A [1]
2.8 A [2]
0.8 A [1]
1.5 A [2]
COM Connector
0.45 A
5.66 A (16W COM)
4.02 A (10W COM)
0.21 A
2.33 A (16W COM)
1.76 A (10W COM)
GTN 650
Main Connector
1.6 A [1]
2.8 A [2]
0.8 A [1]
1.5 A [2]
COM Connector
0.45 A
5.66 A (16W COM)
4.02 A (10W COM)
0.21 A
2.33 A (16W COM)
1.76 A (10W COM)
NAV Connector
0.60 A
1.16A [2]
0.30 A
0.58 A [2]
[1] The specified current draw is with the display backlight set to 100% and the fan operating
at low speed. If the superflags are connected, their current draw must be added in
addition to the specified current.
[2] The specified current draw does not include the superflags. If connected, their current
draw must be added to the specified current. The superflags will supply up to 320 ma
each regardless of the input voltage.

GTN 625/635/650 TSO Installation Manual Page 1-7
190-01004-02 Rev. C
1.3.8 GPS/WAAS Antenna Requirements
Antenna performance is critical to the GPS/SBAS operation. The antennas listed in Table 1-3 provide
acceptable performance with the GTNs.
Table 1-3. Approved GPS Antennas
Model/Description
Conn Type
Mfr
Part Number
Garmin
Order
Number
GA 35, GPS/WAAS
[1]
TNC
Garmin
013-00235-( )
013-00235-( )
Aero Antenna
AT575-93G( )-TNCF-000-RG-27-NM
GA 36, GPS/WAAS
TNC
Garmin
013-00244-( )
013-00244-( )
Aero Antenna
AT575-126G( )-TNCF-000-RG-27-NM
GA 37, GPS/WAAS/XM
TNC
Garmin
013-00245-( )
013-00245-( )
Aero Antenna
AT2300-126G( )-TNCF-000-RG-27-NM
A33W, WAAS Antenna
TNC
Garmin
013-00261-( )
013-00261-( )
Aero Antenna
AT575-332G( )- TNCF-000-RG-27-NM
GPS/VHF Antenna
TNC/BNC
[2]
Comant
CI-2580-200
N/A
GPS/VHF Antenna
TNC/BNC
[2]
Comant
CI-2728-200
N/A
GPS/XM/VHF Antenna
TNC/TNC/BNC
[3]
Comant
CI-2580-410
N/A
GPS/XM/VHF Antenna
TNC/TNC/BNC
[3]
Comant
CI-2728-410
N/A
GPS/WAAS Antenna
TNC
Comant
CI-428-200
N/A
GPS/XM Antenna
TNC/TNC
Comant
CI-428-410
N/A
[1] Same mounting hole pattern as GA 56, but GA 35 antenna has a physically larger footprint.
[2] The antenna connector is a TNC type. The VHF connector is a BNC type.
[3] The antenna connector is a TNC type. The XM connector is a TNC type. The VHF connector is a
BNC type.

Page 1-8 GTN 625/635/650 TSO Installation Manual
Rev. C 190-01004-02
1.4 License Requirements
The Telecommunications Act of 1996, effective February 8, 1996, provides the FCC discretion to
eliminate radio station license requirements for aircraft and ships. The GTN 6XX installations must
comply with current transmitter licensing requirements. In the US, to find out the specific details on
whether a particular installation is exempt from licensing, please visit the FCC web site
http://wireless.fcc.gov/aviation. If an aircraft license is required, make application for a license on FCC
form 404, Application for Aircraft Radio Station License. The FCC also has a fax-on-demand service to
provide forms by fax. Outside the US, contact the responsible telecommunication authority. The
GTN 625, 635, and 650 owner accepts all responsibility for obtaining the proper licensing before using
the transceiver. The maximum transmitting power, modulation identification, and frequency band
information may be required for licensing and are detailed in Section 1.4.4.
CAUTION
The VHF transmitter in this equipment is guaranteed to meet Federal Communications
Commission acceptance over the operating temperature range. Modifications not
expressly approved by Garmin could invalidate the license and make it unlawful to
operate the equipment.