Installation Overview - Garmin GTX 335 w GPS Installation Guidance

3 INSTALLATION OVERVIEW

3.1 Pre-Installation Information..............................................................................................................3-2
3.2 Garmin Available Installation Materials...........................................................................................3-3
3.3 Installation Materials Not Supplied ..................................................................................................3-3
3.4 Installation Considerations ...............................................................................................................3-4
3.5 GTX Series Minimum System Configurations.................................................................................3-4
3.6 Crimping Tools .................................................................................................................................3-4
3.7 Test Equipment .................................................................................................................................3-4
3.8 External Sensors, Devices, and Interface Considerations.................................................................3-5
3.8.1 Mutual Suppression Bus.............................................................................................................3-5
3.8.2 Altitude Source (Required) ........................................................................................................3-5
3.8.3 GPS Source ................................................................................................................................3-6
3.8.4 Installation with Other ADS-B Out Systems .............................................................................3-7
3.9 Placards/Labels .................................................................................................................................3-7
3.10 Switches ............................................................................................................................................3-7
3.11 Antenna Considerations....................................................................................................................3-8
3.11.1 Transponder Antenna .................................................................................................................3-8
3.11.2 Transponder Antenna Location ..................................................................................................3-8
3.11.3 Transponder Antenna Installation ..............................................................................................3-8
3.11.4 GPS Antenna (GTX 335 with SBAS/GPS)................................................................................3-9
3.11.5 GPS Antenna Location.............................................................................................................3-10
3.12 GPS Coaxial Cable Requirements (GTX 335 with SBAS/GPS)....................................................3-12
3.13 General Installation Practices .........................................................................................................3-13
3.13.1 Circuit Protection and Power Distribution ...............................................................................3-13
3.13.2 Audio Interference....................................................................................................................3-13
3.14 Cable and Wiring Considerations ...................................................................................................3-13
3.14.1 Pressurized Aircraft Considerations.........................................................................................3-14
3.14.2 Shield Termination Considerations ..........................................................................................3-14
3.15 General Electrical Bonding.............................................................................................................3-15
3.15.1 Aluminum Surface Preparation ................................................................................................3-17
3.15.2 Bonding Jumper .......................................................................................................................3-18
3.15.3 Transponder Antenna Bonding ................................................................................................3-19
3.15.4 GPS Antenna Bonding .............................................................................................................3-20
3.16 Electrical Load Analysis.................................................................................................................3-21
3.16.1 Aircraft Without Existing Electrical Load Analysis ................................................................3-21
3.16.2 Electrical Load is Decreased After Modification.....................................................................3-21
3.16.3 Electrical Load is Increased After Modification ......................................................................3-22
3.16.4 Performing an Electrical Load Analysis by Measurement.......................................................3-22
3.16.5 Battery Capacity Analysis ........................................................................................................3-29
190-00734-17
Rev. 1
GTX 335 w/GPS Installation Guidance
Page 3-1