Name: Garmin G3X
Brand: Garmin
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190-01115-01 May, 2024 Revision AV

G3X™/G3X Touch™

Avionics Installation

Manual

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

Brand	Garmin
Model	G3X
Category	Avionics Display
Language	English

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