Garmin G900X Manual

190-00719-00 January, 2009 Revision D
G900X
/
G950
Installation and Maintenance Manual

Page A G900X/G950 Installation and Maintenance Manual
Revision D 190-00719-00
© Copyright 2007 - 2009
Garmin Ltd. or its subsidiaries
All Rights Reserved
Except as expressly provided herein, no part of this manual may be reproduced, copied, transmitted,
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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.
Garmin International, Inc.
1200 E. 151st Street
Olathe, KS 66062 USA
Telephone: [phone]
Aviation Dealer Technical Support Line (Toll Free): [phone]
www.garmin.com
Garmin (Europe) Ltd
Liberty House
Bulls Copse Road
Hounsdown Business Park
Southampton, SO40 9RB, UK
Telephone: [phone]
RECORD OF REVISIONS
Revision Revision
Date Description
A 4/9/07 Initial Release
B 9/4/07
Expanded Airframe Specific Section
C 12/19/07 Added Three-Display Information
D 1/27/09 Added the G950
DOCUMENT PAGINATION
Section Page Range Section Page Range
Table of Contents i - vi Section 13 13-1 – 13-18
Section 1 1-1 – 1-32 Section 14 14-1 – 14-16
Section 2 2-1 – 2-18 Section 15 15-1 – 15-52
Section 3 3-1 – 3-8 Appendix A A-1 – A-86
Section 4 4-1 – 4-22 Appendix B B-1 – B-64
Section 5 5-1 – 5-32 Appendix C C-1 – C-68
Section 6 6-1 – 6-12 Appendix D D-1 – D-70
Section 7 7-1 – 7-10 Appendix E E-1 – E-45
Section 8 8-1 – 8-10 Appendix F F-1 – F-19
Section 9 9-1 – 9-4 Appendix G G-1 – G-25
Section 10 10-1 – 10-6 Appendix H H-1 – H-4
Section 11 11-1 – 11-12 Appendix I I-1 – I-3
Section 12 12-1 – 12-34 Appendix J J-1 – J-3

G900X/G950 Installation and Maintenance Manual – Table of Contents Page i
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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.
NOTE
The GDU 1040 lamps contain mercury and must be recycled or disposed of according to
local, state, or federal laws. If you have any questions or would like additional
information, please refer to our web site at
www.garmin.com/aboutGarmin/environment/disposal.jsp.
NOTE
Unless otherwise noted all installation guidance, requirements, and instructions apply to
both the two-display and three-display G900X/G950 system.
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 the United States without first obtaining an export
license. The preceding statement is required to be included on any and all reproductions
in whole or in part of this manual.

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Revision D 190-00719-00
TABLE OF CONTENTS
PARAGRAPH PAGE
1 G900X/G950 Installation Overview ................................................................................................1-1
1.1 Introduction......................................................................................................................................1-1
1.2 System Overview.............................................................................................................................1-2
1.3 General G900X/G950 LRU Specifications......................................................................................1-5
1.4 Mechanical Aspects .......................................................................................................................1-13
1.5 Electrical Considerations ...............................................................................................................1-24
1.5 Wiring Considerations ...................................................................................................................1-19
1.6 Antenna Considerations .................................................................................................................1-28
1.7 Instructions for Continued Airworthiness......................................................................................1-31
1.8 Standby Instruments.......................................................................................................................1-32
2 GDU 1040........................................................................................................................................2-1
2.1 Equipment Description.....................................................................................................................2-1
2.2 Electrical Specifications...................................................................................................................2-2
2.3 Environmental Specifications ..........................................................................................................2-3
2.4 TSO/ETSO.......................................................................................................................................2-4
2.5 Installation Requirements...............................................................................................................2-16
2.6 Installation Considerations.............................................................................................................2-16
2.7 Mounting Requirements.................................................................................................................2-17
2.8 Unit Installation..............................................................................................................................2-18
2.9 Continued Airworthiness ...............................................................................................................2-18
3 GMA 1347 .......................................................................................................................................3-1
3.1 Equipment Description.....................................................................................................................3-1
3.2 Electrical Specifications...................................................................................................................3-3
3.3 Environmental Specifications ..........................................................................................................3-4
3.4 TSO/ETSO.......................................................................................................................................3-4
3.5 Installation Requirements.................................................................................................................3-5
3.6 Installation Considerations...............................................................................................................3-6
3.7 Mounting Requirements...................................................................................................................3-7
3.8 Unit Installation................................................................................................................................3-8
3.9 Continued Airworthiness .................................................................................................................3-8

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4 GIA 63W..........................................................................................................................................4-1
4.1 Equipment Description.....................................................................................................................4-1
4.2 Electrical Specifications...................................................................................................................4-3
4.3 Environmental Specifications ..........................................................................................................4-8
4.4 TSO/ETSO.......................................................................................................................................4-8
4.5 Installation Requirements...............................................................................................................4-15
4.6 Installation Considerations.............................................................................................................4-17
4.7 Mounting Requirements.................................................................................................................4-19
4.8 Unit Installation..............................................................................................................................4-20
4.9 Continued Airworthiness ...............................................................................................................4-21
5 GEA 71 ............................................................................................................................................5-1
5.1 Equipment Description.....................................................................................................................5-1
5.2 Electrical Specifications...................................................................................................................5-2
5.3 Environmental Specifications ..........................................................................................................5-2
5.4 TSO/ETSO.......................................................................................................................................5-3
5.5 Installation Requirements.................................................................................................................5-5
5.6 Installation Considerations...............................................................................................................5-5
5.7 Mounting Requirements.................................................................................................................5-30
5.8 Unit Installation..............................................................................................................................5-32
5.9 Continued Airworthiness ...............................................................................................................5-32
6 GDC 74A .........................................................................................................................................6-1
6.1 Equipment Description.....................................................................................................................6-1
6.2 Electrical Specifications...................................................................................................................6-2
6.3 Environmental Specifications ..........................................................................................................6-3
6.4 TSO/ETSO.......................................................................................................................................6-4
6.5 Installation Requirements.................................................................................................................6-5
6.6 Installation Considerations...............................................................................................................6-6
6.7 Mounting Requirements...................................................................................................................6-9
6.8 Unit Installation................................................................................................................................6-9
6.9 Continued Airworthiness ...............................................................................................................6-11

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7 GRS 77/GMU 44..............................................................................................................................7-1
7.1 Equipment Description.....................................................................................................................7-1
7.2 Electrical Specifications...................................................................................................................7-2
7.3 Environmental Specifications ..........................................................................................................7-2
7.4 TSO/ETSO.......................................................................................................................................7-3
7.5 Installation Requirements.................................................................................................................7-5
7.6 Installation Considerations...............................................................................................................7-5
7.7 Mounting Requirements...................................................................................................................7-5
7.8 Unit Installation................................................................................................................................7-9
7.9 Continued Airworthiness ...............................................................................................................7-10
8 GTX 33 ............................................................................................................................................8-1
8.1 Equipment Description.....................................................................................................................8-1
8.2 Electrical Specifications...................................................................................................................8-4
8.3 Environmental Specifications ..........................................................................................................8-5
8.4 TSO/ETSO.......................................................................................................................................8-5
8.5 Installation Requirements.................................................................................................................8-6
8.6 Installation Considerations...............................................................................................................8-7
8.7 Mounting Requirements...................................................................................................................8-8
8.8 Unit Installation..............................................................................................................................8-10
8.9 Continued Airworthiness ...............................................................................................................8-10
9 GCU 476 (Optional).........................................................................................................................9-1
9.1 Equipment Description.....................................................................................................................9-1
9.2 Electrical Specifications...................................................................................................................9-2
9.3 Environmental Specifications ..........................................................................................................9-2
9.4 TSO/ETSO.......................................................................................................................................9-3
9.5 Installation Requirements.................................................................................................................9-3
9.6 Installation Considerations...............................................................................................................9-3
9.7 Mounting Requirements...................................................................................................................9-4
9.8 Unit Installation................................................................................................................................9-4
9.9 Continued Airworthiness .................................................................................................................9-4

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10 GDL 69(A)/GRT 10/GRC 10 (Optional).......................................................................................10-1
10.1 Equipment Description...................................................................................................................10-1
10.2 Electrical Specifications.................................................................................................................10-2
10.3 Environmental Specifications ........................................................................................................10-2
10.4 TSO/ETSO.....................................................................................................................................10-3
10.5 Installation Requirements...............................................................................................................10-4
10.6 Installation Considerations.............................................................................................................10-4
10.7 Mounting Requirements.................................................................................................................10-5
10.8 Unit Installation..............................................................................................................................10-5
10.9 Continued Airworthiness ...............................................................................................................10-6
11 GWX 68 (Optional)........................................................................................................................11-1
11.1 Equipment Description...................................................................................................................11-1
11.2 Electrical Specifications.................................................................................................................11-2
11.3 Environmental Specifications ........................................................................................................11-2
11.4 TSO/ETSO.....................................................................................................................................11-3
11.5 Installation Requirements...............................................................................................................11-4
11.6 Installation Considerations.............................................................................................................11-4
11.7 Mounting Requirements.................................................................................................................11-4
11.8 Unit Installation..............................................................................................................................11-4
11.9 Continued Airworthiness .............................................................................................................11-11
12 Garmin GPS WAAS Antennas ......................................................................................................12-1
12.1 Description.....................................................................................................................................12-1
12.2 GA 35 Teardrop GPS WAAS Antenna..........................................................................................12-1
12.3 GA 36 ARINC Mount GPS WAAS Antenna ................................................................................12-2
12.4 GA 37 ARINC Mount GPS WAAS and XM Antenna..................................................................12-3
12.5 GPS WAAS and FIS Antenna Installation Considerations and Mounting Requirements.............12-4
12.6 ARINC 743 Footprint Antenna Installation (GA 36 and GA 37)................................................12-17
12.7 Non-Structural Mount Installation...............................................................................................12-28
13 Non LRU Specific Installation Information...................................................................................13-1
13.1 Shield Block Installation Instruction..............................................................................................13-1
14 3rd Party Interfaces .........................................................................................................................14-1
14.1 Discretes.........................................................................................................................................14-1
14.2 LRU’s...........................................................................................................................................14-15
15 Software, Configuration, and Calibration......................................................................................15-1
15.1 Configuration Mode.......................................................................................................................15-1
15.2 Software and Configuration Loading Procedures..........................................................................15-3
15.3 Additional Configuration.............................................................................................................15-24
15.4 Calibration....................................................................................................................................15-32

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APPENDIX A: G900X/G950 Pinout Information...................................................................................A-1
A.1 GDU 1040.......................................................................................................................................A-3
A.2 GMA 1347 ......................................................................................................................................A-5
A.3 GIA 63W.......................................................................................................................................A-17
A.4 GEA 71 .........................................................................................................................................A-49
A.5 GDC 74A ......................................................................................................................................A-58
A.6 GRS 77/GMU 44...........................................................................................................................A-64
A.7 GTX 33 .........................................................................................................................................A-68
A.8 GCU 476 (optional).......................................................................................................................A-75
A.9 GDL 69(A) (optional)...................................................................................................................A-77
A.8 GRT 10 (optional).........................................................................................................................A-81
A.11 GWX 68 (optional) .......................................................................................................................A-84
APPENDIX B: Airframe Specific Installation Guidance........................................................................B-1
B.1 Introduction.....................................................................................................................................B-1
B.2 Van’s Aircraft..................................................................................................................................B-5
B.3 Lancair Aircraft.............................................................................................................................B-17
APPENDIX C: Post-Installation Checkout Procedure & Warranty Registration.................................... C-1
C.1 Post-Installation Checkout Procedure (G900X Only)..................................................................... C-1
C.2 System Testing & Checkout..........................................................................................................C-19
C.3 PICP Completion Form.................................................................................................................C-54
C.4 Warranty........................................................................................................................................C-55
APPENDIX D: Troubleshooting .............................................................................................................D-1
APPENDIX E: Outline & Installation Drawings..................................................................................... E-1
APPENDIX F: G900X/G950 Core Two-Display Interconnects ..............................................................F-1
APPENDIX G: G900X/G950 Core Three-Display Interconnects...........................................................G-1
APPENDIX H: G900X/G950 Piston GEA Interconnects .......................................................................H-1
APPENDIX I: G900X/G950 Turbo GEA Interconnects ...........................................................................I-1
APPENDIX J: G900X/G950 GIA 63W Discrete Interconnects.............................................................. J-1

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1 G900X/G950 Installation Overview
1.1 Introduction
This manual provides an overview of the G900X/G950 Integrated Flight Deck and its mechanical and
electrical installation aspects. The system design is flexible and can accommodate different aircraft
applications.
The following outline describes the organization of this manual:
Section 1: This section contains a basic overview of the G900X/G950 system and interface.
Block diagrams are given to aid in the understanding of the system.
Section 2: This section describes the mechanical, electrical, and installation aspects of the
GDU 1040.
Section 3: This section describes the mechanical, electrical, and installation aspects of the
GMA 1347.
Section 4: This section describes the mechanical, electrical, and installation aspects of the
GIA 63W.
Section 5: This section describes the mechanical, electrical, and installation aspects of the
GEA 71.
Section 6: This section describes the mechanical, electrical, and installation aspects of the
GDC 74A.
Section 7: This section describes the mechanical, electrical, and installation aspects of the
GRS 77/GMU 44.
Section 8: This section describes the mechanical, electrical, and installation aspects of the
GTX 33.
Section 9: This section describes the mechanical, electrical, and installation aspects of the
GCU 476.
Section 10: This section describes the mechanical, electrical, and installation aspects of the
GDL 69(A)/GRT 10/GRC 10.
Section 11: This section describes the mechanical, electrical, and installation aspects of the
GWX 68.
Section 12: This section describes the mechanical, electrical, and installation aspects of the
Garmin GPS WAAS antennas.
Section 13: This section describes the non-LRU specific installation aspects of the G900X/G950.
Section 14: This section contains general guidance for 3rd party LRU’s and discrete interfaces.
Section 15: This section contains software/configuration loading and calibration procedures.
Appendix A: This section contains pinout information for all G900X/G950 LRU’s.
Appendix B: This section contains airframe specific installation guidance for the G900X/G950.
Appendix C: This section contains post-installation checkout procedures and warranty registration
for the G900X.
Appendix D: This section contains G900X/G950 troubleshooting information.
Appendix E: This section contains outline and installation drawings for the Garmin G900X/G950
LRU’s.

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Appendix F: The section contains G900X/G950 core two-display interconnects.
Appendix G: This section contains G900X/G950 core three-display interconnects.
Appendix H: This section contains G900X/G950 piston engine GEA interconnects.
Appendix I: This section contains G900X/G950 turboprop engine GEA interconnects.
Appendix J: This section contains G900X/G950 GIA I/O interconnects.
1.2 System Overview
The G900X/G950 is an advanced technology avionics suite designed to integrate pilot/aircraft interaction
into one central system. The system combines primary flight instrumentation, aircraft systems
instrumentation, and navigational information, all displayed on two large color screens. The
G900X/G950 system is composed of several sub-units or Line Replaceable Units (LRUs). LRUs have a
modular design and can be installed directly behind the instrument panel or in a separate avionics bay if
desired. This design greatly eases troubleshooting and maintenance of the G900X/G950 system. A
failure or problem can be isolated to a particular LRU, which can be replaced quickly and easily. Each
LRU has a particular function, or set of functions, that contributes to the system’s operation. For
additional information on LRU functions, see the applicable section of this manual.
1.2.1 Applicability
This installation manual provides guidance for installation and configuration of the G900X/G950 system.
The G900X/G950 supports a wide variety of aircraft models and common 3rd party integration options to
allow for maximum versatility and adaptability.
Common features of the G900X/G950 are noted below:
•Hardware / Software Configuration – A standard set of supported configurations with
common LRU part numbers is available for both the G900X and G950. Although
individual LRUs will utilize common TSO authorized software, separate system software
loader images will be released for both G900X and G950 systems and version differences
may exist.
•Engine Indicating System (EIS) Support – Both systems provide the installer the
option of configuring the system with or without engine instrumentation display (Section
15 details the supported G900X/G950 engine variants). In the event that a G900X/G950
system is configured as a “No EIS” system (and separate external engine indications are
used), then additional flight plan information is placed in the location normally occupied
by the EIS strip.
•Crew Alerting System (CAS) – A common set of engine and airframe integration alerts
exist for both the G900X and G950 systems. Refer to section 14 for additional detailed
on standard and optional CAS alerts.
•Autopilot Support – Both systems provide outputs to a separate 3rd party autopilot,
although supported autopilots may vary. Refer to the Software Configuration and
Calibration (Section 15) and the System Interconnects (Appendix F-J) Sections for
additional detail on supported 3rd party autopilots.
The G900X is intended for use on experimental (not Type Certificated) aircraft, while the G950 system is
intended for use on select aircraft certified under FAR Part 23 regulations. The G950 is a fixed
configuration of the G1000 integrated flight deck. As such, all LRU regulatory information and TSOA
authorizations received in support of G1000 airframe certifications apply to G950 as well.

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1.2.2 System Architecture
The following diagrams illustrate the redundant communication paths that are in place in a typical
G900X/G950 installation. Refer to Appendix F-J for actual interconnects.
Figure 1-1. G900X/G950 Two-Display Interconnect Summary

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Figure 1-2. G900X/G950 Three-Display Interconnect Summary

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Table 1-1 illustrates the differences in the number of LRU’s required for a two-display installation and a
three-display installation. Refer to Table 1-2 for LRU part numbers.
Table 1-1. G900X/G950 LRU Quantities
LRU Two-Display Three-Display
GDU 1040 2 3
GIA 63W 2 2
GEA 71* 0 (No EIS) or
1 (EIS) 0 (No EIS) or 1 (EIS)
GDC 74A 1 2
GTP 59 1 2
GRS 77 1 2
GMU 44 1 2
GMA 1347 1 1
GTX 33 1 2
* Dual engine EIS display is not currently supported.
1.3 General G900X/G950 LRU Specifications
1.3.1 Garmin LRU Part Numbers
Table 1-2. G900X/G950 LRU Part Numbers
LRU Assembly Part
Number Unit Only Part Number
GDU 1040 011-00972-03 010-00337-03
GIA 63W
011-01105-00
(G900X Only)
or
011-01105-01
010-00386-00
(G900X Only)
or
010-00386-10
GEA 71 011-00831-00 010-00283-00
GDC 74A 011-00882-10 010-00336-10
GTP 59 011-00978-00 011-00978-00
GRS 77 011-00868-10 010-00295-10
GMU 44 011-00870-00 010-00296-00
GMA 1347 011-00809-00 010-00276-00
GTX 33 011-00779-10 010-00267-10
GCU 476
011-01237-00
(G900X Only)
or
011-01237-10
010-00457-00
(G900X Only)
or
010-00457-10
GDL 69 011-00986-00 010-00326-99
GRT 10 011-01557-00
GRC 10 011-01558-00
GDL 69A 011-00987-00 010-00339-00
GWX 68 011-00883-00 010-00299-00
GA 35 013-00235-00 013-00235-00
GA 36 013-00244-00 013-00244-00
GA 37 013-00245-00 013-00245-00

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1.3.2 Power Specifications
With the exception of J605 of the GIA 63W, all LRUs are capable of operating at either 14 or 28 VDC.
See the individual LRU specific Environmental Qualification Form for details on surge ratings and
minimum/maximum operating voltages. See Table 1-3 for current draw specifications.
Table 1-3. G900X/G950 LRU Current Specifications
LRU Maximum 14
Volt Current
Draw
Maximum 28
Volt Current
Draw
GDU 1040 3.36 A 2.50 A
GMA 1347 3.75 A 1.75 A
GEA 71 1.00 A 0.50 A
GDC 74A 410 mA 200 mA
GRS 77/
GMU 44 600 mA 300 mA
GTX 33 3.10 A 1.60 A
GCU 476 277 mA 140 mA
GDL 69(A) 650 mA 350 mA
GRT 10 44 mA 44 mA
GIA 63W
(J601) N/A
0.3 A
(not transmitting)
4.3 A
(transmitting)
GIA 63W
(J605) 2.0 A 1.0 A
GWX 68 4.0 A 2.0 A

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1.3.3 Physical Specifications
All width, height, and depth measurements are taken with unit rack (if applicable) and connectors.
Table 1-4. G900X/G950 LRU Physical Specifications
LRU Width Height Depth Unit Weight
Unit Weight
w/Rack &
Connector
Weight
GIA 63W 3.83 inches
(9.73 cm) 7.26 inches (18.44 cm) 10.00 inches (25.39 cm) 5.3 lbs. (2.40 kg) 7.2 lbs. (3.26 kg)
GEA 71 1.23 inches
(3.12 cm) 7.26 inches (18.44 cm) 9.07 inches (23.04 cm) 1.75 lbs. (0.721 kg) 2.53 lbs. (1.011 kg)
GTX 33 1.72 inches
(4.37 cm) 7.26 inches (18.44 cm) 11.05 inches (28.07 cm) 3.10 lbs. (1.41 kg) 3.86 lbs. (1.75 kg)
GDL 69(A) 1.23 inches
(3.12 cm) 7.26 inches (18.44 cm) 9.07 inches (23.04 cm) 1.86 lbs. (0.84kg) 2.83 lbs. (1.27kg)
GRC 10 2.46 inches
(6.25 cm) 1.16 inches (2.95 cm) 5.00 inches (12.70 cm) 0.34 lbs (0.15kg) N/A
GRT 10 2.74 inches
(6.96 cm) 0.92 inches (2.34 cm) 3.93 inches (9.98 cm) 0.15 lbs. (0.07kg) 0.27 lbs. (0.12kg)
GDU 1040 11.80 inches
(29.97 cm) 7.70 inches (19.59 cm) 3.77 inches (9.58 cm) 6.29 lbs. (2.85 kg) 6.53 lbs. (2.96 kg)
GMA 1347 1.35 inches
(3.43 cm) 7.70 inches (19.56 cm) 7.79 inches (19.79 cm) 1.70 lbs. (0.77 kg) 2.40 lbs. (1.09 kg)
GCU 476 3.66 inches
(9.30 cm) 5.43 inches (13.76 cm) 2.31 inches (5.88 cm) 0.72 lbs. (0.33 kg) 0.94 lbs. (0.43 kg)
GDC 74A 3.10 inches
(7.87 cm) 3.23 inches (8.20 cm) 9.64 inches (24.49 cm) 1.58 lbs. (0.72 kg) 2.30 lbs. (1.04 kg)
GRS 77 3.62 inches
(9.19 cm) 3.32 inches (8.43 cm) 9.84 inches (24.99 cm) 2.80 lbs. (1.27 kg) 3.46 lbs. (1.57 kg)
GMU 44 N/A 2.10 inches
(5.33 cm) N/A 0.35 lbs.
(0.16 kg) 0.48 lbs. (0.22 kg)
GWX 68 See Appendix E for the GWX 68 Outline Drawing 9.00 lbs
(4.08 kg) 9.40 lbs. (4.26 kg)

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1.3.4 Environmental Specifications
Refer to the applicable environmental qualification form (Table 1-5) for a complete list of environmental
characteristics. Table 1-5. G900X/G950 LRU Environmental Qualification Forms
Document Garmin Part Number
GDU 1040 Environmental Qualification Form 005-00150-02
GMA 1347 Environmental Qualification Form 005-00155-79
GEA 71 Environmental Qualification Form 005-00147-02
GDC 74A Environmental Qualification Form 005-00191-77
GRS 77 Environmental Qualification Form 005-00165-31
GMU 44 Environmental Qualification Form 005-00164-31
GTX 33 Environmental Qualification Form 005-00131-03
GCU 476 Environmental Qualification Form 005-00299-01
GDL 69/69A Environmental Qualification Form 005-00217-33
GIA 63W Environmental Qualification Form 005-00148-02
GWX 68 Environmental Qualification Form 005-00171-00
GA 56A Environmental Qualification Form 005-00240-00
GA 56W Environmental Qualification Form 005-00232-00
GA 57 Environmental Qualification Form 005-00240-00
GRT Environmental Qualification Form 005-00217-86
GRC Environmental Qualification Form 005-00217-85
1.3.5 Cooling Requirements
External cooling is required for the GIA 63W, GDU 1040, and GTX 33. External cooling is optional for
all other G900X/G950 LRUs. When external cooling is required the following guidelines should be
followed:
•All external cooling fans should be connected to their own circuit breaker. If this is not possible,
all external cooling fans should be combined on the same circuit breaker as the LRU they are
cooling (proper circuit breaker sizing considerations must be taken into consideration).
•If a form of forced air cooling is installed, make certain that rainwater or condensation cannot
enter and be sprayed on the equipment.

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1.3.5.1 GDU 1040 Cooling Requirements
External cooling of the GDU 1040 is required. A fan bracket (Garmin P/N 115-00973-00) is available to
mount an axial fan (Garmin recommended fan 013-00102-00, See Table 1-6) to the system rack. The
bracket is designed to secure a 2.36 x 2.36 inch (60 x 60 mm) axial fan. See Appendix E for dimensions
and assembly instructions. Alternate fans can be found in Table 1-7.
Table 1-6. GDU 1040 Cooling Fan (013-00102-00) Specifications
Characteristic Specification
Operating Voltage 22-31 VDC
Current 100 mA (nominal)
250 mA (maximum)
Air Flow (no load) 20 CFM (10 CFM @ .08” H2O)
Operating
Temperature -20 to +55°C
Maximum
Operating Altitude 55,000 feet
Weight 0.25 lb
Figure 1-3. GDU 1040 Cooling Fan (013-00102-00) Drawing

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Revision D 190-00719-00
Alternatively, the following fans have been evaluated and reportedly meet the minimum specification of
20 cfm airflow. This information is provided for reference only. Garmin makes no claims on the quality
or performance of these alternate cooling fans.
Table 1-7. Alternate GDU 1040 Cooling Fans and Specifications
Manufacturer Part Number Operating
Voltage
(VDC) Power (W) Max Airflow
(cfm) Noise (dBA)
NMB-MAT 2410ML-05W-B40-BOO0 24 2.16 21.5 33.5
NMB-MAT 2410ML-05W-B50-BOO0 24 2.40 23.3 35.0
NMB-MAT 2410RL-05W-B50-C00 24 2.88 24.0 33.5
NMB-MAT 2410ML-04W-B40-BOO0 12 2.04 21.2 33.5
NMB-MAT 2410ML-04W-B50-BOO0 12 2.40 23.3 35.0
NMB-MAT 2410RL-04W-B50-C00 12 1.80 24.0 33.5
Comair Rotron 032710(CR0624HB-A) 24 3.60 23.2 32.3
Comair Rotron 032704(CR0612HB-A) 12 2.76 23.2 32.3

G900X/G950 Installation and Maintenance Manual – G900X/G950 Installation Overview Page 1-11
190-00719-00 Revision D
1.3.5.2 GIA 63W and GTX 33 Cooling Requirements
External cooling of the GIA 63W and GTX 33 is required. A 5/8” diameter air fitting is provided on the
rear of the mounting rack for the purpose of admitting cooling air. It is recommended that a 3 port blower
fan is used with an airflow rating of 5 cfm per port or greater. See Table 1-8 for Garmin recommended
fans.
Table 1-8. Recommended GIA/GTX Cooling Fan Specifications
Garmin Part
Number
Operating
Voltage
(VDC)
Operating
Current (mA) Max Airflow
(cfm)
Weight
(lbs)
Maximum
Operating
Temperature
Maximum
Operating
Altitude
013-00067-00 14 1000 (nominal)
1,700 (start-up) 25 1.18 -20 to +55°C 55,000 feet
013-00067-01 28 500 (nominal)
850 (start-up) 25 1.18 -20 to +55°C 55,000 feet
Figure 1-4. GIA/GTX Cooling Fan (013-00067-XX) Drawing

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Revision D 190-00719-00
1.3.5.3 Thermal Cooling Validation
Garmin requires that all new G950 installations in type certificated aircraft perform thermal validation in
accordance with the below plans as part of the installation approval and certification process.
•Thermal Management Plan, Garmin part number 190-00313-50
•Thermal Validation Plan, Garmin part number 190-00313-51
Although Garmin strongly recommends that all installations perform thermal validation tests as described
in the above documents, G900X systems may alternately comply by installing cooling fans in accordance
with the guidelines provided herein.