Name: Garmin G3X
Brand: Garmin
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190-01115-01 G3X™/G3X Touch™ Avionics Installation Manual

Rev. AV Page E-1

APPENDIX E GDU™ 37X DISPLAY INSTALLATION

NOTE

The GDU 37X has been discontinued and is no longer available for purchase.

This section contains general information as well as installation information for the GDU 37X. Use this

section to mount the GDU 37X unit(s).

Figure E-1 GDU 37X Unit View

1 Inventory of Materials15
- 1.1 Unpacking Unit15
- 1.2 Required Garmin Equipment15
  - 1.2.1 Garmin LRU (Line Replaceable Unit) List for G3X systems15
- 1.3 Optional Garmin Equipment16
  - 1.3.1 Garmin Optional LRU Installation Kits16
  - 1.3.2 GPS/XM Antenna(s)17
- 1.4 Optional Garmin LRUs18
- 1.5 Required non-Garmin Equipment19
- 1.6 Optional Garmin Equipment (non-LRU)24
- 1.7 Optional non-Garmin Equipment24
  - 1.7.1 Engine/Airframe Sensors24
  - 1.7.2 Mounting Hardware24
- 1.8 Optional 3rd Party Sensors/LRUs24
- 1.9 Garmin Software and Documents24
2 Installation Preparation25
- 2.1 System Overview25
  - 2.1.1 System Architecture and Interface Capabilities26
- 2.2 Electrical Considerations40
  - 2.2.1 Power Specifications40
    - 2.2.1.1 GAP 26 Power Requirements40
    - 2.2.1.2 Other LRU Power Requirements41
- 2.3 Wiring/Cabling Considerations43
  - 2.3.1 Wiring Harness Installation43
- 2.4 Mechanical Considerations54
- 2.5 LRU/Sensor Installation Information58
  - 2.5.1 External Navigator Connection/Configuration58
3 GAD 27 (Flaps/Lights/Trim Controller) Installation59
- 3.1 Equipment Description59
  - 3.1.1 Status LED60
- 3.2 Equipment Available61
  - 3.2.1 Required Equipment61
  - 3.2.2 Additional Equipment Required61
- 3.3 General Specifications61
- 3.4 Mounting Requirements61
- 3.5 Unit Installation61
- 3.6 Outline and Installation Drawings62
4 GAD 29/29B/29C/29D (ARINC 429 Adapter) Installation64
- 4.1 Equipment Description65
  - 4.1.1 Status LED65
- 4.2 Equipment Available65
  - 4.2.1 Required Equipment65
  - 4.2.2 Additional Equipment Required65
- 4.3 General Specifications66
- 4.4 Mounting Requirements66
- 4.5 Unit Installation66
- 4.6 Outline and Installation Drawings67
5 GAP 26 (Pitot/AOA Probe) Installation70
- 5.1 Equipment Description70
  - 5.1.1 Moisture Protections70
  - 5.1.2 Ice Protection70
- 5.2 Equipment Available71
  - 5.2.1 Required Equipment71
  - 5.2.2 Additional Equipment71
- 5.3 General Specifications71
- 5.4 Mounting Requirements72
- 5.5 Unit Installation74
- 5.6 Outline and Installation Drawings79
6 GDU™ 4XX Display Installation81
- 6.1 Equipment Description82
  - 6.1.1 Navigation Functions83
  - 6.1.2 Interface Summary83
- 6.2 General Specifications83
- 6.3 Installation Information84
  - 6.3.1 Required Equipment84
    - 6.3.1.1 GDU 4XX PFD Configuration Module85
  - 6.3.2 Additional Equipment Required85
- 6.4 Unit Installation85
- 6.5 Antennas85
- 6.6 Mounting Requirements86
- 6.7 GDU 45X Outline and Installation Drawings87
- 6.8 GDU 46X Outline and Installation Drawings90
- 6.9 GDU 470 Outline and Installation Drawings93
- 6.10 Panel Cutout Drawings96
7 GEA™ 24 Engine Interface Module Installation99
- 7.1 Equipment Description99
  - 7.1.1 Status LED100
- 7.2 Equipment Available100
  - 7.2.1 Required Equipment100
  - 7.2.2 Additional Equipment Required100
- 7.3 General Specifications101
- 7.4 Unit Installation101
- 7.5 Mounting Requirements101
- 7.6 Outline and Installation Drawings102
8 GHA 15 Height Advisor Installation105
- 8.1 Equipment Description105
- 8.2 Equipment Available105
  - 8.2.1 Accessories105
  - 8.2.2 Accessories not Supplied106
- 8.3 General Specifications106
- 8.4 Mounting Requirements107
  - 8.4.1 Mounting/Doubler Plate107
  - 8.4.2 Grounding107
- 8.5 Unit Installation108
- 8.6 Outline and Installation Drawings109
9 GI 260 (AOA Indicator) Installation110
- 9.1 Equipment Description110
- 9.2 Equipment Available110
  - 9.2.1 Required Equipment110
  - 9.2.2 Additional Equipment Required110
- 9.3 General Specifications110
- 9.4 Unit Installation111
- 9.5 Unit Calibration111
- 9.6 Unit Operation111
- 9.7 Outline and Installation Drawings112
10 GMC 305 (AFCS Mode Controller) Installation113
- 10.1 Equipment Description113
- 10.2 Equipment Available113
  - 10.2.1 Required Equipment113
  - 10.2.2 Additional Equipment Required114
- 10.3 General Specifications114
- 10.4 Mounting and Wiring Requirements114
- 10.5 Outline and Installation Drawings116
11 GMC 307 (AFCS Mode Controller) Installation120
- 11.1 Equipment Description120
- 11.2 Equipment Available120
  - 11.2.1 Required Equipment120
  - 11.2.2 Additional Equipment Required121
- 11.3 General Specifications121
- 11.4 Mounting and Wiring Requirements121
- 11.5 Outline and Installation Drawings123
12 GMC 507 (AFCS Mode Controller) Installation127
- 12.1 Equipment Description127
- 12.2 General Specifications128
- 12.3 Mounting and Wiring Requirements128
- 12.4 Outline and Installation Drawings130
13 GMU 11 (Magnetometer) Installation137
- 13.1 Equipment Description137
- 13.2 General Specifications137
- 13.3 Equipment Available138
- 13.4 Unit Installation138
  - 13.4.1 Consideration for Wing Grounded Lighting Fixtures140
  - 13.4.2 Mounting Instructions140
- 13.5 Outline and Installation Drawings141
14 GMU 22 (Magnetometer) Installation144
- 14.1 Equipment Description144
  - 14.1.1 Interface Summary144
- 14.2 General Specifications145
- 14.3 Equipment Available145
- 14.4 Unit Installation146
- 14.5 Outline and Installation Drawings150
15 GPS 20A (WAAS GPS Position Source) Installation155
- 15.1 Equipment Description155
  - 15.1.1 Status LED156
- 15.2 Statement of Compliance (per AC 90-114A CHG1)156
- 15.3 Equipment Available156
  - 15.3.1 Required Equipment156
  - 15.3.2 Additional Equipment Required157
- 15.4 General Specifications157
- 15.5 Mounting Requirements157
- 15.6 Unit Installation157
- 15.7 Antennas157
- 15.8 Antenna Cable Requirements157
- 15.9 Outline and Installation Drawings158
16 GSA 28 (Autopilot Servo) Installation161
- 16.1 Equipment Description161
  - 16.1.1 Status LED162
- 16.2 Equipment Available162
- 16.3 General Specifications163
  - 16.3.1 Power Specifications164
  - 16.3.2 Torque Specifications164
- 16.4 Required Equipment165
  - 16.4.1 Additional Equipment Required165
- 16.5 Unit Installation166
- 16.6 Unit Wiring177
- 16.7 Outline and Installation Drawings177
17 GSU 25/25B/25C/25D (AHRS/Air Data Sensor Unit) Installation204
- 17.1 Equipment Description204
  - 17.1.1 Status LED205
- 17.2 General Specifications206
- 17.3 Required Equipment207
  - 17.3.1 Additional Equipment Required207
- 17.4 Unit Installation208
- 17.5 Outline and Installation Drawings213
18 GTP 59 (Temperature Probe) Installation218
- 18.1 Equipment Description218
  - 18.1.1 Additional Equipment Required219
- 18.2 General Specifications219
- 18.3 Unit Installation219
- 18.4 GTP 59 Icing221
- 18.5 Outline and Installation Drawings222
19 GTR 20 (VHF Communications Radio) Installation223
- 19.1 Equipment Description223
  - 19.1.1 Status LED224
- 19.2 Equipment Available224
  - 19.2.1 Unit Configurations224
  - 19.2.2 Additional Equipment Required224
- 19.3 General Specifications225
  - 19.3.1 COM Specifications225
- 19.4 Installation Considerations226
- 19.5 Antenna Considerations227
  - 19.5.1 COM Antenna Location227
  - 19.5.2 Interference of GPS228
- 19.6 Mounting Considerations229
- 19.7 Mounting, Wiring, and Power Checks230
- 19.8 Outline and Installation Drawings232
20 GPS/XM Antenna Installation235
- 20.1 Non-Garmin Materials Required235
- 20.2 Non-Garmin Antennas235
- 20.3 Garmin Antennas236
- 20.4 Antenna Mounting Considerations238
- 20.5 Teardrop Footprint Antenna Installation (GA 35, GA 55, and GA 56)243
- 20.6 ARINC 743 Footprint Antenna Installation (GA 36, GA 37, GA 55A, GA 57X)250
- 20.7 Non-Structural Mount Installation259
- 20.8 Outline and Installation Drawings265
21 Engine/Airframe Sensor Installation272
- 21.1 Engine/Airframe Sensor Options272
- 21.2 Engine Sensor Applications278
- 21.3 Engine Sensor Installation288
22 Connector Installation Instructions307
- 22.1 Cable Connector Installation307
- 22.2 Jackscrew Backshell Assembly307
- 22.3 Jackscrew Connector Installation321
- 22.4 Thermocouple Installation into a Backshell322
- 22.5 Configuration Module Installation into a Backshell324
- 22.6 P-Lead Resistor Installation (Braid Shield)327
- 22.7 Circular Connector328
23 LRU Pinouts331
- 23.1 GAD 27 (Flaps/Lights/Trim Controller)331
- 23.2 GAD 29/29B/29C/29D (ARINC 429 Adapter)340
- 23.3 GDU 4XX (Display Unit)344
- 23.4 GEA 24 (EIS Interface)353
- 23.5 GHA 15 Height Advisor369
- 23.6 GI 260 (AOA Indicator)371
- 23.7 GMC 305 (AFCS Mode Controller)373
- 23.8 GMC 307 (AFCS Mode Controller)375
- 23.9 GMC 507 (AFCS Mode Controller)377
- 23.10 GMU 11 (Magnetometer)379
  - 23.10.1 J441 Connector379
  - 23.10.2 Power Function379
    - 23.10.2.1 Unit ID380
    - 23.10.2.2 CAN Bus380
- 23.11 GMU 22 (Magnetometer)381
- 23.12 GPS 20A (WAAS GPS Position Source)382
- 23.13 GSA 28 (Autopilot Servo)384
- 23.14 GSU 25 (AHRS/Air Data Sensor Unit)387
- 23.15 GTP 59 (Temperature Probe)391
- 23.16 GTR 20 (VHF Communications Radio)392
- 23.17 GTX 23 (Mode S Transponder)397
24 G3X™ Avionics w/GSU 25 and/or GAD 29 Interconnect Drawings401
- 24.1 Core Interconnect Drawings w/GSU 25 and/or GAD 29403
- 24.2 External Interconnect Drawings w/GSU 25414
25 G3X™ Avionics w/GTR 20 Interconnect Drawings452
- 25.1 Notes for Section 25 Drawings453
- 25.2 Single GTR 20 Interconnect Drawings454
- 25.3 Dual GTR 20 Interconnect Drawings458
26 Sensor Wiring Examples460
- 26.1 Notes for Section 26 Drawings460
- 26.2 Sensor Wiring Examples w/GEA™ 24 Engine Interface Module461
- 26.3 Sensor Wiring Examples w/GSU 73467
27 Lycoming/Continental Sensor Wiring Examples471
- 27.1 Notes for Section 27 Drawings471
- 27.2 GEA™ 24 Engine Interface Module - Lycoming/Continental Sensor Drawings472
- 27.3 GSU 73 - Lycoming/Continental Sensor Drawings476
28 Rotax Sensor Wiring Examples478
- 28.1 Notes for Section 28 Drawings478
- 28.2 GEA™ 24 Engine Interface Module - Rotax Sensor Drawings479
- 28.3 GSU 73 - Rotax Sensor Drawings485
29 Jabiru Sensor Wiring Examples487
- 29.1 Notes for Section 29 Drawings487
- 29.2 GEA™ 24 Engine Interface Module - Jabiru Sensor Drawings488
- 29.3 GSU 73 - Jabiru Sensor Drawings490
30 GDU™ 4XX Display Configuration and Post Installation Checkout492
- 30.1 Recommended Test Equipment493
- 30.2 Configuration Mode493
- 30.3 Software Loading Procedure494
- 30.4 Configuration Pages496
- 30.5 Garmin Database Updates727
  - 30.5.1 Updating Garmin Databases727
  - 30.5.2 Available Databases729
- 30.6 SiriusXM® Activation Instructions (GDU 455/465 only)730
- 30.7 External Interface Configuration (Garmin units only)731
- 30.8 Sharing G3X Touch Flight Plans (Crossfill) with External IFR Navigators736
  - 30.8.1 External IFR Navigator Crossfill Configuration737
    - 30.8.1.1 GPS 175, GNX 375, and GTN 6XX/7XX (v6.62 and newer only)737
- 30.9 Checklist Editor737
31 Troubleshooting738
- 31.1 General Troubleshooting738
  - 31.1.1 Status LED739
- 31.2 CAN Network Troubleshooting739
- 31.3 GDU 37X/4XX739
  - 31.3.1 SD Card Slot739
  - 31.3.2 Unit Communication Error Messages (Two or Three GDU Systems)739
- 31.4 Air Data Troubleshooting740
- 31.5 Engine Indication Troubleshooting741
- 31.6 ADAHRS Troubleshooting742
  - 31.6.1 Heading Red-X742
  - 31.6.2 Attitude/Heading Failure Troubleshooting743
- 31.7 Post Installation Calibration Procedures744
- 31.8 Sending Troubleshooting Data to Garmin744
32 Maintenance745
- 32.1 Inspections/Continued Airworthiness/Maintenance745
- 32.2 Return to Service Information748
APPENDIX A Flight Test Plan for Autopilot Tuning752
- A.1 Introduction752
- A.2 Flight Test Outline752
APPENDIX B Airframe Specific Installation Guidance759
- B.1 Introduction759
  - B.1.1 Magnetometer759
    - B.1.1.1 GMU 11 Magnetometer760
    - B.1.1.2 GMU 22 Magnetometer760
- B.2 Van’s Aircraft760
- B.3 Lancair Aircraft763
APPENDIX C RS-232 Text Output Format778
- C.1 Electrical Interface778
- C.2 Message Output Selection778
- C.3 General Message Output Format778
- C.4 Attitude/Air Data Message Format779
- C.5 Engine Data Message Format781
- C.6 GPS Data Message Formats783
- C.7 EIS Complete Data Message Format785
- C.8 CNI Message Format788
APPENDIX D LRU Performance Specifications/Licensing/ Compliance791
- D.1 GAD 29791
  - D.1.1 Environmental Specifications791
- D.2 GAP 26791
  - D.2.1 Environmental Specifications791
- D.3 GDU™ 37X Display791
  - D.3.1 GPS Specifications791
  - D.3.2 Environmental Specifications791
- D.4 GDU 4XX792
  - D.4.1 GPS Specifications792
  - D.4.2 Environmental Specifications792
- D.5 GEA™ 24 Engine Interface Module792
  - D.5.1 Environmental Specifications792
- D.6 GHA 15793
- D.7 GMA™ 245/245R Audio Panel795
  - D.7.1 Certification795
  - D.7.2 Transmitter Grant of Equipment Authorization795
- D.8 GMC 305/307/507796
  - D.8.1 Environmental Specifications796
- D.9 GMU 11797
  - D.9.1 Environmental Specifications797
- D.10 GMU 22797
  - D.10.1 Environmental Specifications797
- D.11 GSA 28797
  - D.11.1 Environmental Specifications797
- D.12 GSU 25798
  - D.12.1 Environmental Specifications798
  - D.12.2 Performance Information799
- D.13 GSU 73800
  - D.13.1 Environmental Specifications800
  - D.13.2 Performance Information800
- D.14 GTP 59801
  - D.14.1 TSO/ETSO Compliance801
  - D.14.2 TSO/ETSO Deviations801
- D.15 GTR 20/200802
APPENDIX E GDU™ 37X Display Installation803
- E.1 Equipment Description804
- E.2 General Specifications806
- E.3 Installation Information806
  - E.3.1 Required Equipment806
    - E.3.1.1 GDU 37X PFD Configuration Module807
  - E.3.2 Additional Equipment Required807
- E.4 Pinouts808
- E.5 Unit Installation813
- E.6 Antennas813
- E.7 Mounting Requirements813
  - E.7.1 Unit Installation813
  - E.7.2 Panel Cutout Template813
- E.8 Outline and Installation Drawings815
APPENDIX F GSU 73 Sensor Unit Installation817
- F.1 Equipment Description817
  - F.1.1 Features Summary818
- F.2 General Specifications818
- F.3 Required Equipment819
  - F.3.1 GSU 73 Configuration Module819
  - F.3.2 Additional Equipment Required820
- F.4 Unit Installation820
- F.5 Pinouts820
- F.6 Outline and Installation Drawings835
APPENDIX G GSU 73 Interconnect Drawings837
- G.1 Core Interconnect Drawings838
- G.2 External Interconnect Drawings w/GSU 73841
APPENDIX H GDU™ 37X Display Configuration and Post Installation Checkout851
- H.1 Recommended Test Equipment852
- H.2 Configuration Mode853
- H.3 Software Loading Procedure853
- H.4 Configuration Pages856
- H.5 Garmin Database Updates993
  - H.5.1 Updating Garmin Databases994
  - H.5.2 Available Databases996
- H.6 SiriusXM® Activation Instructions (GDU 375 only)997
- H.7 External Interface Configuration (Garmin units only)998
- H.8 GDU Start-up Screen1001
- H.9 Checklist Editor1001
APPENDIX I GDU 4XX Advanced Gauge Configuration1002
- I.1 Example 1 - Vfe Exceedance Alert1002
- I.2 Example 2 - Dynamic RPM Gauge Markings Based on Oil Temperature1004
- I.3 Example 3 - Takeoff Trim Position Alert1007

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Garmin G3X Specifications

General

Display Type	LCD
Touchscreen	Yes
Power Input	10-32 VDC
Connectivity	Bluetooth, Wi-Fi (optional)
Interfaces	RS-232
GPS	Internal GPS/WAAS receiver
AHRS	Integrated AHRS
Air Data Computer	Integrated Air Data Computer
Autopilot Compatibility	Compatible with Garmin autopilots
Operating Temperature	-20°C to +55°C
Sunlight Readability	Sunlight readable display
Screen Size	10.6 inches