Garmin G3X Touch User manual

190-02472-02 2019 Revision 2
Garmin G3X Touch
Electronic Flight Instrument System
Part 23 AML STC Maintenance Manual
Contains Instructions for Continued
Airworthiness for STC SA01899WI

Maintenance Manual 190-02472-02
G3X Touch EFIS Part 23 AML STC Revision 2
Page ii
© Copyright 2019
Garmin Ltd. or its subsidiaries
All Rights Reserved
Except as expressly provided herein, no part of this manual may be reproduced, copied,
transmitted, disseminated, downloaded or stored in any storage medium, for any purpose
without the express prior written consent of Garmin. Garmin hereby grants permission to
download a single copy of this manual and of any revision to this manual onto a hard drive or
other electronic storage medium to be viewed and to print one copy of this manual or of any
revision hereto, provided that such electronic or printed copy of this manual or revision must
contain the complete text of this copyright notice and provided further that any unauthorized
commercial distribution of this manual or any revision hereto is strictly prohibited.
Garmin International, Inc.
1200 E. 151st Street
Olathe, KS 66062 USA
Telephone: [phone]
www.garmin.com
Garmin (Europe) Ltd.
Liberty House
Bulls Copse Road
Hounsdown Business Park
Southampton, SO40 9RB, UK
Phone: [phone]
Fax: [phone]
RECORD OF REVISIONS
Revision Revision Date Description ECO #
1 03/15/2019 Initial release ------
2 4/05/2019 Added interface to GPS 175 / GNX 375, limitations for
GTS 8XX and non-Garmin autopilots
188679

Maintenance Manual 190-02472-02
G3X Touch EFIS Part 23 AML STC Revision 2
Page iii
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. 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
the 1979. The preceding statement is required to be included on any and all reproductions in whole or in
part of this manual.
The information on this document is subject to change without notice. For updates and supplemental
information regarding the operation of Garmin products visit www.fly.garmin.com.

Maintenance Manual 190-02472-02
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Page iv
SOFTWARE LICENSE AGREEMENT FOR GARMIN AVIATION PRODUCTS
BY USING THE DEVICE, COMPONENT OR SYSTEM MANUFACTURED OR SOLD BY GARMIN (“THE
GARMIN PRODUCT’), YOU AGREE TO BE BOUND BY THE TERMS AND CONDITIONS OF THE
FOLLOWING SOFTWARE LICENSE AGREEMENT. PLEASE READ THIS AGREEMENT CAREFULLY.
Garmin Ltd. and its subsidiaries (“Garmin”) grants you a limited license to use the software embedded in
the Garmin Product (the “Software”) in binary executable form in the normal operation of the Garmin
Product. Title, ownership rights, and intellectual property rights in and to the Software remain with Garmin
and/or its third-party providers. You acknowledge that the Software is the property of Garmin and/or its
third-party providers and is protected under the United States of America copyright laws and international
copyright treaties. You further acknowledge that the structure, organization, and code of the Software are
valuable trade secrets of Garmin and/or its third-party providers. You agree not to reproduce, decompile,
disassemble, modify, reverse assemble, reverse engineer, or reduce to human readable form the
Software or any part thereof or create any derivative works based on the Software. You agree not to
export or re-export the Software to any country in violation of the export control laws of the United States
of America.

Maintenance Manual 190-02472-02
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Page v
WARNING, CAUTION, and NOTE DEFINITIONS
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. Refer to www.dtsc.ca.gov/hazardouswaste/perchlorate.
WARNING
Failure to properly configure the EIS gauges per the POH/AFM and other approved data could result in
serious injury, damage to equipment, or death.
NOTE
All screen shots used in this document are current at the time of publication. Screen shots are intended to
provide visual reference only. All information depicted in screen shots, including software file names,
versions and part numbers, is subject to change and may not be up to date.
NOTE
Ensure no dust or grit accumulates at the bottom of the display glass. The GDU 4X0 display uses
invisible infrared beams for touch detection, this makes it very important to keep the screen clean,
especially along the edges.
WARNING
Awarning is used to bring to the installer’s immediate attention not only
damage to the equipment, but personal injury may occur if the instruction is
disregarded.
CAUTION
A caution means damage to equipment is possible if procedural step is not followed.
NOTE
A note provides additional information.

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Page vi
TABLE OF CONTENTS
SECTION PAGE
1. INTRODUCTION ........................................................................................................................ 1
1.1 Content, Scope, Purpose.................................................................................................... 1
1.2 Organization........................................................................................................................ 2
1.3 Acronyms & Abbreviations.................................................................................................. 3
1.4 Publications......................................................................................................................... 5
1.5 Revision and Distribution .................................................................................................... 5
2. SYSTEM DESCRIPTION............................................................................................................ 6
2.1 Equipment Descriptions ...................................................................................................... 7
2.2 G3X Optional Interfaces.................................................................................................... 14
2.3 G3X Touch Architecture Example..................................................................................... 15
2.4 Electrical Power Distribution ............................................................................................. 17
3. G3X CONTROL & OPERATION.............................................................................................. 18
3.1 GDU 4X0 Softkeys/Features and Control......................................................................... 18
3.2 Display Modes................................................................................................................... 19
4. INSTRUCTIONS FOR CONTINUED AIRWORTHINESS ........................................................ 26
4.1 Airworthiness Limitations .................................................................................................. 26
4.2 Servicing Information ........................................................................................................ 27
4.3 Maintenance Intervals....................................................................................................... 27
4.4 Visual Inspection ............................................................................................................... 29
4.5 Electrical Bonding Test ..................................................................................................... 29
4.6 GSU 25D Earth Magnetic Field Updates .......................................................................... 30
4.7 Special Inspection Requirements ..................................................................................... 30
5. TROUBLESHOOTING ............................................................................................................. 31
5.1 General Troubleshooting .................................................................................................. 31
5.2 CAN Bus Network Troubleshooting .................................................................................. 32
5.3 GDU 4X0........................................................................................................................... 35
5.4 GSU 25D ADAHRS and GMU 11 Magnetometer Troubleshooting.................................. 37
5.5 Engine Indication Troubleshooting.................................................................................... 44
5.6 Traffic Alert Messages ...................................................................................................... 45
5.7 Transponder Alert Messages............................................................................................ 46
5.8 Loss of Navigation Information (External Navigators) ...................................................... 46
5.9 Garmin GFC 500 Failure Messages ................................................................................. 47
5.10 Loss of Non-Garmin Autopilot Heading and/or Course Datum......................................... 47
5.11 Miscellaneous Alerts ......................................................................................................... 47
5.12 Aircraft Harness/LRU Connectors..................................................................................... 47
6. G3X EQUIPMENT REMOVAL & REINSTALLATION ............................................................. 61
6.1 GDU 4X0........................................................................................................................... 61
6.2 GSU 25D ADAHRS........................................................................................................... 64
6.3 GMU 11 Magnetometer..................................................................................................... 65
6.4 GTP 59 Temperature Probe ............................................................................................. 66
6.5 GAD 27 Electronic Adapter Unit ....................................................................................... 67
6.6 GEA 24 Engine Indicating System.................................................................................... 68

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6.7 GAD 29B ARINC 429 Adapter .......................................................................................... 72
6.8 GDL 5XR Datalink............................................................................................................. 73
6.9 GPS Antenna (p/n 011-04036-00) .................................................................................... 74
7. G3X EQUIPMENT CONFIGURATION & TESTING ................................................................ 76
7.1 GDU 4X0........................................................................................................................... 76
7.2 GSU 25D ADAHRS and GMU 11 Magnetometer............................................................. 76
7.3 GMU 11 Magnetometer..................................................................................................... 84
7.4 GTP 59 Temperature Probe ............................................................................................. 84
7.5 GAD 27 ............................................................................................................................. 84
7.6 GEA 24 Engine and Airframe Unit .................................................................................... 84
7.7 GAD 29B ........................................................................................................................... 85
7.8 GDL 5XR........................................................................................................................... 85
7.9 G3X Software Information................................................................................................. 85
7.10 Activation of GDL 51R/52R SiriusXM Radio and Weather ............................................... 90
8. SYSTEM RETURN TO SERVICE PROCEDURE .................................................................... 91
8.1 Recommended Test Equipment ....................................................................................... 91
8.2 Transponder Check........................................................................................................... 92
8.3 GPS Receiver Check ........................................................................................................ 92
8.4 NAV Receiver Check ........................................................................................................ 94
8.5 ADS-B Traffic Interface Check.......................................................................................... 95
8.6 TIS-A Traffic Interface Check............................................................................................ 95
8.7 WX-500 Stormscope Interface Check............................................................................... 96
8.8 FIS-B Weather via ADS-B In............................................................................................. 96
8.9 GDL 51R/52R SXM Weather Check................................................................................. 96
8.10 GDL 51R/52R SXM Audio Interface Check ...................................................................... 97
8.11 EIS Check ......................................................................................................................... 97
8.12 ADAHRS and Magnetometer Ground Checks.................................................................. 98
8.13 Garmin GFC 500 Autopilot.............................................................................................. 100
8.14 Non-Garmin Autopilot Interface ...................................................................................... 100
8.15 G5 Miscompare Check.................................................................................................... 103
8.16 EMI / RFI Check.............................................................................................................. 103
APPENDIX A INSTALLATION SPECIFIC INFORMATION ....................................... A-1
A.1 Maintenance Records ..................................................................................................... A-1
A.2 Equipment Locations....................................................................................................... A-2
A.3 Wire Routing ................................................................................................................... A-2
APPENDIX B EXTERNAL INTERFACE CONFIGURATION ..................................... B-1
B.1 GPS/VHF Nav Interfaces ................................................................................................ B-1
B.2 GPS NAV Interface ......................................................................................................... B-4
B.3 VHF NAV/COM Interface ................................................................................................ B-5
B.4 Traffic and Weather Source ............................................................................................ B-6
B.5 Non-Garmin Autopilot Systems....................................................................................... B-8
B.6 Audio Panel................................................................................................................... B-11
B.7 EIS Sensors .................................................................................................................. B-12
B.8 Antennas ....................................................................................................................... B-15

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B.9 ADS-B Antenna Interface.............................................................................................. B-16
LIST OF ILLUSTRATIONS
FIGURE PAGE
Figure 2-1 – GDU 460 (Single Display, with EIS Optional).............................................................. 8
Figure 2-2 – GDU 470...................................................................................................................... 9
Figure 2-3 – GSU 25D ADAHRS ................................................................................................... 10
Figure 2-4 – GMU 11 Magnetometer ............................................................................................. 10
Figure 2-5 – GTP 59 ...................................................................................................................... 11
Figure 2-6 – GAD 29B (ARINC 429 Adapter) ................................................................................ 11
Figure 2-7 – GAD 27 ...................................................................................................................... 12
Figure 2-8 – GEA 24 Engine and Airframe Unit............................................................................. 12
Figure 2-9 – GDL 52R Data Link ................................................................................................... 13
Figure 2-10 – GPS Antenna........................................................................................................... 14
Figure 2-11 – G3X Architecture (Summary) .................................................................................. 15
Figure 3-1 – GDU Features and Controls ...................................................................................... 19
Figure 3-2 – Split/Full Format Buttons - GDU 460...................................................................... 20
Figure 3-3 – Split/Full Format Buttons - GDU 470...................................................................... 20
Figure 3-4 – Normal Mode, Full Format – PFD w/ EIS (Example)................................................. 20
Figure 3-5 – Normal Mode, Split Format – PFD W/ EIS (Example)............................................... 21
Figure 3-6 – Normal Mode, Full – MFD with EIS (Example).......................................................... 22
Figure 3-7 – GDU Knob Function Example ................................................................................... 23
Figure 3-8 – Data Entry Options (Examples)................................................................................. 23
Figure 3-9 – Configuration Mode Pages ........................................................................................ 24
Figure 5-1 – Incorrect CAN Bus Topographies.............................................................................. 33
Figure 5-2 – Correct CAN Bus Wiring Example and Node Connections....................................... 33
Figure 5-3 – Network Error Rate (Configuration/Diagnostic Mode)............................................... 34
Figure 5-4 – Heading Failure Indication......................................................................................... 39
Figure 5-5 – Attitude Failure Indication .......................................................................................... 40
Figure 5-6 – Magnetometer Interference Test On-screen Instructions.......................................... 41
Figure 5-7 – Magnetometer Interference Test Progress................................................................ 42
Figure 5-8 – Magnetometer Interference Test Status.................................................................... 42
Figure 5-9 – Engine/Airframe Failure Indications .......................................................................... 44
Figure 5-10 – View of P4X01 Connector from back of GDU ......................................................... 48
Figure 5-11 – View of P4X02 Connector from back of GDU ......................................................... 48
Figure 5-12 – View of J251 Connector on the GSU 25D............................................................... 50
Figure 5-13 – View of J252 Connector on the GSU 25D............................................................... 50
Figure 5-14 – View of J111 Connector on the GMU 11................................................................. 51
Figure 5-15 – View of J271 Connector on the GAD 27 ................................................................. 52
Figure 5-16 – View of TB273 Terminal Block on GAD 27 ............................................................. 54
Figure 5-17 – View of J241 Connector on the GEA 24.................................................................. 54
Figure 5-18 – View of J242 Connector on the GEA 24.................................................................. 55
Figure 5-19 – View of J243Connector on the GEA 24................................................................... 56
Figure 5-20 – View of J244 Connector on the GEA 24.................................................................. 57

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Figure 5-21 – View of J291 Connector on the GAD 29B ............................................................... 58
Figure 5-22 – View of J292 Connector on the GAD 29B ............................................................... 59
Figure 5-23 – View of J5X1 Connector on the GDL 5XR .............................................................. 60
Figure 6-1 – GDU 460 Shown, (GDU 470 Similar) ........................................................................ 62
Figure 6-2 – Configuration Module (PFD)...................................................................................... 63
Figure 6-3 – GDU 460-Mounted GSU 25D (GDU 470 similar) ...................................................... 64
Figure 6-4 – Remote mounted GSU 25D....................................................................................... 65
Figure 6-5 – GMU 11 Magnetometer ............................................................................................. 66
Figure 6-6 – GTP 59 Temperature Probe ...................................................................................... 67
Figure 6-7 – GAD 27 ...................................................................................................................... 68
Figure 6-8 – GEA 24 ...................................................................................................................... 69
Figure 6-9 – Pressure Sensor, Coupling Mount Type ................................................................... 70
Figure 6-10 – Carburetor Air Temperature Sensor Mounting ........................................................ 71
Figure 6-11 – Fuel Flow Transducer Installation Example ............................................................ 72
Figure 6-12 – GAD 29B.................................................................................................................. 73
Figure 6-13 – GDL 5XR (GDL 52R Shown)................................................................................... 74
Figure 6-14 – GPS Antenna (Screw-mounted Installation Example) ............................................ 75
Figure 6-15 – GPS Antenna (Hook and Loop Installation Example) ............................................. 75
Figure 7-1 – Aircraft Level Attitude ................................................................................................ 78
Figure 7-2 – Pitch/Roll Offset Calibration in Progress ................................................................... 79
Figure 7-3 – Pitch/Roll Offset Completion Status .......................................................................... 79
Figure 7-4 – Compass Rose Starting Position............................................................................... 80
Figure 7-5 – Magnetometer Calibration On-Screen Instructions ................................................... 80
Figure 7-6 – Magnetometer Calibration Progress.......................................................................... 81
Figure 7-7 – Static Pressure Calibration ........................................................................................ 82
Figure 7-8 – Static Pressure Calibration Warning ......................................................................... 82
Figure 7-9 – Static Pressure Calibration Instructions .................................................................... 82
Figure 7-10 – Static Pressure Calibration in Progress................................................................... 82
Figure 7-11 – Static Pressure Calibration Completion Status ....................................................... 83
Figure 7-12 – Update Software Window ........................................................................................ 89
Figure 7-13 – Data Link Page ........................................................................................................ 90
Figure 8-1 – Transponder Setup Page (Normal Mode) ................................................................. 92
Figure A-1– Generic Aircraft Figure ............................................................................................. A-3
LIST OF TABLES
TABLE PAGE
Table 1-1 – Required Documents .................................................................................................... 5
Table 2-1 – G3X Touch AML STC Installed Sensors .................................................................... 12
Table 2-2 – GDL 5XR Data Link Features and Functions ............................................................. 13
Table 2-3 – G3X Touch and Supporting Equipment...................................................................... 17
Table 2-4 – LRU Current Draw ...................................................................................................... 17
Table 3-1 – LRU Status Indicator Symbols.................................................................................... 24
Table 4-1 – Maintenance Intervals................................................................................................. 28
Table 4-2 – Electrical Bonding Procedure ..................................................................................... 30

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Table 5-1 – Status LED Indications ............................................................................................... 32
Table 5-2 – LED Indications Recommended Action ...................................................................... 32
Table 5-3 – CAN Network Error Values (Configuration/Diagnostic Mode) .................................... 34
Table 5-4 – Unit Communication Error Messages (Dual GDU Installations)................................. 36
Table 5-5 – GDU Reboot During Engine Start............................................................................... 36
Table 5-6 – ADAHRS and Magnetometer Troubleshooting........................................................... 37
Table 5-7 – Magnetometer Interference Test Sequence Example ................................................ 43
Table 5-8 – EIS Gauges Troubleshooting...................................................................................... 44
Table 5-9 – Traffic Alert Troubleshooting....................................................................................... 45
Table 5-10 – Transponder Alert Troubleshooting .......................................................................... 46
Table 5-11 – Loss of Navigation Information (External Navigators) .............................................. 46
Table 5-12 – Miscellaneous Alerts................................................................................................. 47
Table 5-13 – P4X01/J4X01 Pin Functions ..................................................................................... 48
Table 5-14 – P4X02/J4X02 Pin Functions ..................................................................................... 49
Table 5-15 – P251/J251 Pin Functions.......................................................................................... 50
Table 5-16 – P252/J252 Pin Functions.......................................................................................... 51
Table 5-17 – P111/J111 Pin Functions.......................................................................................... 51
Table 5-18 – GTP 59 Lead Wire Functions ................................................................................... 52
Table 5-19 – P271/J271 Pin Functions.......................................................................................... 52
Table 5-20 – TB273 Terminal Functions........................................................................................ 54
Table 5-21 – P241/J241 Pin Functions.......................................................................................... 54
Table 5-22 – P242/J242 Pin Functions.......................................................................................... 55
Table 5-23 – P243/J243 Pin Functions.......................................................................................... 56
Table 5-24 – P244/J244 Pin Functions.......................................................................................... 57
Table 5-25 – P291/J291 Pin Functions.......................................................................................... 58
Table 5-26 – P292/J292 Pin Functions.......................................................................................... 59
Table 5-27 – P5X1/J5X1 Pin Functions ......................................................................................... 60
Table 6-1 – GDU Configuration Module Kit (P/N 010-12253-01) .................................................. 63
Table 7-1 – GSU 25D/GMU 11 Recalibration Criteria ................................................................... 77
Table 8-1 – LRU Status Indicators................................................................................................. 91
Table 8-2 – Airspeed Test Points................................................................................................... 99
Table 8-3 – Heading Verification – ADAHRS Check ................................................................... 100
Table 8-4 – EMI Victim/Source Matrix ......................................................................................... 105
Table A-1 – G3X Post-Installation Log......................................................................................... A-1
Table A-2 – G3X Equipment Locations........................................................................................ A-2
Table B-1 – Compatible Equipment – GPS/VHF Nav Interfaces................................................. B-1
Table B-2 – Compatible Equipment – GPS NAV......................................................................... B-4
Table B-3 – Compatible Equipment – VHF NAV/COM................................................................ B-5
Table B-4 – Compatible Traffic and Weather Sources ................................................................ B-6
Table B-5 – Compatible Equipment – Non-Garmin Autopilots .................................................... B-8
Table B-6 – Compatible EIS Sensors ........................................................................................ B-12
Table B-7 – Supported GPS & SXM Antennas.......................................................................... B-15
Table B-8 – GPS or GPS/WAAS Antenna Minimum Requirements.......................................... B-15
Table B-9 – SXM Satellite Radio Antenna Minimum Requirements.......................................... B-16

Maintenance Manual 190-02472-02
G3X Touch EFIS Part 23 AML STC Revision 2
Page 1
1. INTRODUCTION
1.1 Content, Scope, Purpose
This document provides Instructions for Continued Airworthiness (ICA) for the Garmin G3X Touch EFIS
Part 23 AML STC as installed in Part 23 aircraft under Supplemental Type Certificate (STC) SA01899WI.
This document satisfies the requirements for continued airworthiness as defined by 14 CFR Part 23.1529
Appendix G. Information in this document is required to maintain the continued airworthiness of the G3X
Touch EFIS systems.
1.1.1 Applicability
This document applies to all aircraft with the G3X Touch system installed in accordance with AML STC
SA01899WI.
Modification of an aircraft by this STC obligates the aircraft operator to include the maintenance
information provided by this document in the operator’s Aircraft Maintenance Manual and the operator’s
Aircraft Scheduled Maintenance Program.

Maintenance Manual 190-02472-02
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Page 2
1.2 Organization
This manual is structured as described below:
Section 2: System Description
Provides an overview of the G3X Touch EFIS system equipment installed by this STC.
Section 3: Control & Operation
Presents basic control and operation information specifically tailored to maintenance practices. Basic
G3X Touch Configuration Mode operation is also described.
Section 4: Instructions for Continued Airworthiness
Provides maintenance instructions for Continued Airworthiness of the G3X Touch EFIS system.
Section 5: Troubleshooting
Provides troubleshooting information to aid in diagnosing and resolving potential problems with
equipment and functions installed by this STC.
Section 6: G3X Equipment Removal & Replacement
Gives instructions for the removal and replacement of G3X Touch EFIS equipment.
Section 7: G3X Equipment Configuration & Testing
Gives instructions for loading software, configuring, and testing of G3X Touch EFIS equipment.
Section 8: System Return to Service Procedure
Specifies return-to-service (checkout) procedures to be performed upon completion of maintenance of the
G3X Touch EFIS system.
Appendix A: Installation Specific Information
Provides a template to record aircraft-specific installation and configuration data for the G3X Touch EFIS
system.

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Page 3
1.3 Acronyms & Abbreviations
AC: Advisory Circular
ADAHRS: Air data, Attitude and Heading
Reference System.
ADI: Analog Devices, Inc.
ADS-B: Automatic Dependent Surveillance -
Broadcast
ADS-R: Automatic Dependent Surveillance -
Rebroadcast
AFCS: Aircraft Flight Control System
AFM: Airplane Flight Manual
AHRS: Attitude and Heading Reference System
ALT: Altitude Preselect
AML: Approved Model List
AND: Logical AND
ARINC: Aeronautical Radio, Incorporated
AS: Aerospace Standard
ASI: Airspeed Indicator
AWG: American Wire Gauge
BNC: Bayonet Neill–Concelman
CAN: Controller Area Network
CDI: Course Deviation Indicator
CDU: Control Display Unit
CE: European Committee
CFR: Code of Federal Regulations
CHT: Chart Processing
CI: Course to Intercept
COM: Communication Radio
CRS: Course
CS: Conducted Susceptibility
DC: Direct Current
DDM: Difference in Depth of Modulation
DME: Distance Measuring Equipment
DMM: Digital Multi Meter
ECO: Engineering Change Order
EEPROM: Electrically Erasable Programmable
Read-Only Memory
EFIS: Electronic Flight Instrument System
EGT: Exhaust Gas Temperature
EIS: Engine Indication System
EMC: Electromagnetic Compatibility
EMI: ElectroMagnetic Interference
ES: Extended Squitter
FAA: Federal Aviation Administration
FF: Fuel Flow
FIS-B: Flight Information Service Broadcast
GA: Go-Around
GAD: Garmin Adapter
GDL: Garmin Datalink LRU
GDU: Garmin Display Unit
GEA: Garmin Engine and Airframe Unit
GFC: Garmin Automatic Flight Control System
GMU: Garmin Magnetometer Unit
GNS: Garmin Navigation System
GNX: Garmin Navigator Transponder
GPS: Global Positioning System
GPSS: GPS Roll Steering
GSU: Garmin Sensor Unit
GTN: Garmin Touch Navigator
GTP: Garmin Temperature Probe
GTR: Garmin Transmitter / Receiver
GTS: Garmin Traffic System
GTX: Garmin Transponder
HDG: Heading (mode)
HSDB: High Speed Data Bus
HSI: Horizontal Situation Indicator
IAS: Indicated Air Speed
ICA: Instructions for Continued Airworthiness
ID: Identifier
IFR: Instrument Flight Rules
IGRF: International Geomagnetic Reference
Field
ILS: Instrument Landing System
KTS: Knots
LCD: Liquid Crystal display
LED: Light Emitting Diode
LNAV: Lateral Navigation
LOC: Localizer
LRU: Line-Replaceable Unit
METAR: Meteorological Terminal Aviation
Routine Weather Report
MFD: Multi-Function Display
MFR: Manufacturer
NEXRAD: Next-Generation Radar
NMEA: National Marine Electronics Association
OAT: Outside Air Temperature
OBS: Omni Bearing Selector
OR: Logical OR
PFD: Primary Flight Display
POH: Pilot’s Operating Handbook
RPM: Revolutions per Minute
RTCA: Radio Technical Commission for
Aeronautics
RX: Receive
SAS: Stability Augmentation System
SD: SanDisk Memory
STC: Supplemental Type Certificate
SXM: Sirius XM
SYS: System
TAS: Traffic Advisory System
OR
True Airspeed
TAWS: Terrain Awareness and Warning System

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TCAS: Traffic Collision Avoidance System
TIS: Traffic Information Service
TIS-A: Traffic Information Service-A
TIS-B: Traffic Information Service - Broadcast
TIT: Turbine Inlet Temperature
TNC: Threaded Neill–Concelman
TSO: Technical Standard Order
TX: Transmit
UAT: Universal Access Transceiver
UHF: Ultra High Frequency
VDC: Volts of Direct Current
VFR: Visual Flight Rules
VHF: Very High Frequency
VLOC: VOR/Localizer
VNAV: Vertical Navigation
VOR: VHF Omni Directional Radio Range
WAAS: Wide Area Augmentation System
WPT: Waypoint
XM: XM Satellite Radio

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Page 5
1.4 Publications
The following documents are required by this maintenance manual to perform maintenance. It is the
responsibility of the owner / operator to ensure latest versions of these documents are used during
operation, servicing or maintenance of the airplane.
Table 1-1 – Required Documents
Document Number Garmin Document Title
190-02472-00 Garmin G3X Pilot’s Guide for Certified Aircraft
190-02472-01 Garmin G3X Touch EFIS Part 23 AML STC Installation Manual
1.5 Revision and Distribution
This document is required for maintaining the continued airworthiness of the aircraft. When this document
is revised, each page will also be revised to indicate the current revision level.
Garmin Dealers may obtain the latest revision of this document on the Garmin Dealer Resource Center
website.
Owners/operators may obtain the latest revision of this document by one of the following methods:
Visit https://fly.garmin.com/support
Contact a Garmin dealer
Contact Garmin Product Support at 913-397-8200, toll free 866-739-5687

Maintenance Manual 190-02472-02
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Page 6
2. SYSTEM DESCRIPTION
This section provides an overview of the line replaceable units (LRUs) installed by the G3X Touch EFIS
Part 23 AML STC.
The Garmin G3X Touch EFIS replaces the standard pneumatic instruments (altimeter, airspeed indicator
(ASI) and vacuum attitude gyro indicator) and combines primary flight instrumentation, aircraft systems
instrumentation, and navigational information, all displayed on one- or two-color Garmin Display Units
(GDU) 4X0. The following functionalities can be provided by the G3X Touch EFIS system:
Primary Flight Display (PFD)
Multi-Function Display (MFD)
Optional Engine Indicating System (EIS)
Optional Traffic and Weather Receiver (ADS-B In)
Optional SiriusXM Weather and Radio (subscription required)
A G3X system installed per this STC may consist of one of the following display configurations:
1. Single 7-inch GDU 470 (portrait orientation) PFD with the capability to be split into a PFD/MFD
configuration but with no support for EIS.
2. Single 10.6-inch GDU 460 with PFD/MFD split capability and EIS supported.
3. Dual 7-inch GDU 470 (portrait orientation), one configured as PFD and the other as MFD, with
EIS only supported on the MFD.
4. Single 7-inch GDU 470 (portrait orientation) as PFD and a single 10.6-inch GDU 460 as MFD with
the EIS only supported on 10.6-inch MFD.
5. Single 10.6-inch GDU 460 as PFD and a single 7-inch GDU 470 (portrait orientation) as MFD,
with the EIS supported in either the PFD or MFD.
When two GDUs are installed, one as PFD and the other as an MFD, failure of one display unit will cause
the system to automatically revert to a reversionary format. In the reversionary format, primary flight
information, radio tuning information and EIS (if installed) are displayed on the remaining GDU.
Additionally, a multi-function pane can be displayed if the “split” touchscreen button is selected.
Each of the above display configurations require the following LRUs and equipment as part of the
installation:
GSU 25D Air Data Computer, Aircraft Heading and Reference System (ADAHRS)
GMU 11 Magnetometer
GTP 59 Temperature Probe
GPS Antenna
GEA 24 Engine and Airframe adaptor (Optional) (required for EIS)
GAD 27 Electronic Adapter Unit (required for 14-volt aircraft with EIS and optional for 14-volt
aircraft without EIS).
Standby attitude, airspeed, and altitude instruments are required if a G3X display unit is installed as the
primary flight display (PFD) in IFR installations. The standby instruments may be a Garmin G5 or existing
pneumatic instruments.
The G3X system is composed of several sub-units or Line Replaceable Units (LRUs). The LRUs have a
modular design and can be installed directly behind the instrument panel or mounted directly on the panel
in the case of a GDU, or in a separate location. Each LRU has a particular function, or set of functions, as
described in their applicable sections.
A GPS antenna is required for G3X installations. The GDU contains an internal WAAS GPS receiver
which supports VFR navigation only. IFR navigation requires a compatible certified navigator that can
interface to the G3X system and display flight plan and guidance on the GDU. Alternatively, navigation

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equipment that is not compatible with G3X can retain their separate external indicator to maintain IFR
capability. The external indicator installation is outside the scope of this STC.
G3X systems using optional SiriusXM (SXM) or ADS-B receivers require dedicated antennas which are
not installed under this STC.
2.1 Equipment Descriptions
2.1.1 GDU 460
The Garmin Display Unit (GDU) 460 provides a central display and user interface for the G3X Touch EFIS
Touch system. GDU 460 is a 10.6-inch landscape-oriented, panel mounted control and display unit with
a GPS receiver. The GDU features a high-resolution infrared touchscreen user interface augmented by a
set of dual-concentric knobs and dedicated buttons for commonly used functions. The GDU 460 is
mounted flush to the aircraft instrument panel on the left side within the pilot’s primary field of view. Below
is a list of some of the functions provided by the GDU 460.
Many of the listed functions depend on optional equipment interfaces and/or subscription services.
PFD Functions
Primary attitude, heading, and air data information
Slip/skid and rate-of-turn indication
Synthetic Vision including Pathways and Flight Path Marker
Horizontal Situation Indicator (HSI)
Flight Director display with GFC500 autopilot modes and alerts
Clock and timer
MFD Functions
Moving map with VFR flight planning function
Charts and SafeTaxi
Traffic display and alerting
Terrain and obstacle display and alerting
Datalink weather
Display of flight plan and navigation from an external Garmin GPS navigator
Display of navigation from an external VOR/ILS NAV radio
Control and display of Transponder and Com radios
System Interfaces
Display engine parameters when configured and interfaced with a Garmin Engine Adapter (GEA
24).
Wireless Bluetooth transceiver that can communicate with tablet computers and other Garmin
devices that support Connext interface protocol. Refer to G3X Touch Pilot’s Guide for Certified
Aircraft (190-02472-00) for guidance in using Connext Bluetooth connections.
CAN and RS-232 interfaces to communicate with Garmin LRUs and other devices. Refer to the
appropriate sections in G3X Touch EFIS Part 23 AML STC Installation Manual (190-02472-01)
for interconnect and configuration information.
BNC connector for GPS antenna (only required on PFD)
One GDU 460 may be installed as a single PFD (see Figure 2-1) or with a GDU 470 in a dual display
configuration.

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Figure 2-1 – GDU 460 (Single Display, with EIS Optional)
2.1.2 GDU 470
The Garmin Display Unit (GDU) 470 provides a central display and user interface for the G3X Touch EFIS
Touch system. The Garmin Display Unit (GDU) 470 is a 7-inch LCD portrait-oriented panel mounted
control and display unit with a GPS receiver. The GDU features a high-resolution infrared touchscreen
user interface augmented by a set of dual-concentric knobs and dedicated buttons for commonly used
functions. The GDU 470 is mounted flush to the aircraft instrument panel on the left side within the pilot’s
primary field of view. Below is a list of some of the functions provided by the GDU 470.
Many of the listed functions depend on optional equipment interfaces and/or subscription services.
PFD Functions
Primary attitude, heading, and air data information
Slip/skid and rate-of-turn indication
Synthetic Vision including Pathways and Flight Path Marker
Horizontal Situation Indicator (HSI)
Flight Director display with GFC500 autopilot modes and alerts
Clock and timer
MFD Functions
Moving map with VFR flight planning function
Charts and SafeTaxi
Traffic display and alerting
Terrain and obstacle display and alerting
Datalink weather
Display of flight plan and navigation from an external Garmin GPS navigator
Display of navigation from an external VOR/ILS NAV radio
Control and display of Transponder and Com radios

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System Interfaces
Display engine parameters when configured and interfaced with a Garmin Engine Adapter (GEA
24).
Wireless Bluetooth transceiver that can communicate with tablet computers and other Garmin
devices that support Connext interface protocol. Refer to G3X Touch Pilot’s Guide for Certified
Aircraft (190-02472-00) for guidance in using Connext Bluetooth connections.
CAN and RS-232 interfaces to communicate with Garmin LRUs and other devices. Refer to the
appropriate sections in the G3X Touch EFIS Part 23 AML STC Installation Manual (190-02472-
01) for interconnect and configuration information.
BNC connector for GPS antenna (only required on PFD)
One GDU 470 may be installed as a single PFD configuration (see Figure 2-2) or two GDU 470s as a
dual PFD and MFD configuration. EIS is only supported on a GDU 470 configured as an MFD in a dual
display system. A GDU 470 may also be installed with a GDU 460 in a dual display configuration.
The display on a 7” GDU when configured as an MFD (in a dual display configuration) does not have split
format functionality in normal mode but is available in reversionary mode if the PFD fails.
NOTE
EIS is not supported in a single GDU 470 installation.
Figure 2-2 – GDU 470

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2.1.3 GSU 25D ADAHRS
The GSU 25D is an LRU that provides Air Data Computer and Attitude Heading Reference System
(ADAHRS) information. The GSU 25D interfaces to a remote mounted GMU 11 magnetometer for
heading information, and computes OAT and TAS from inputs provided by the GTP 59. The GSU 25D is
connected to existing primary pitot/static system. Only one GSU 25D is approved for installation and
interface by this STC.
Figure 2-3 – GSU 25D ADAHRS
2.1.4 GMU 11 Magnetometer
The Garmin GMU 11 Magnetometer is a remote mounted device that provides magnetic field
measurements to the GSU 25D to support computation of flight attitude and heading data.
Figure 2-4 – GMU 11 Magnetometer
2.1.5 GTP 59 Temperature Probe
The Garmin GTP 59 is an externally mounted temperature probe that provides raw outside air
temperature data. The device is a three-wire temperature probe interface.