Electrical Installation; Wiring (Addition/Change); Special Tools Required; Power Distribution - Garmin GTX 335 w GPS Installation Guidance

4.3 Electrical Installation

4.3.1

Wiring (Addition/Change)

The modifications contained in this section are mandatory and applicable for all installations to meet the
requirements of this STC.
• Refer to appendix C for equipment compatibility and configuration.
• Refer to appendix B for the approved interface diagrams.
4.3.2

Special Tools Required

A crimp tool meeting MIL specification M22520/2-01 and a positioner/locator are required to make sure
there are consistent, reliable crimp contact connections for the D-sub connector.
• Refer to table 3-5 for a list of recommended crimp tools.
4.3.3

Power Distribution

Circuit protection for the GTX must be a push-pull manually resettable circuit breaker (e.g., Klixon 7274
Series circuit breakers). The circuit breaker must be labeled as specified in figure B-1 and readily
accessible to the pilot.
4.3.4

Wire and Cable Considerations

Make sure damage does not occur to the wiring and cables during installation.
• Reference FAA AC 43.13-1B for installation guidance for wire routing and installation.
4.3.5

Coaxial Cable Preparation

Follow the manufacturer's instructions for coaxial cable preparation.
4.3.6

Wire Harness Construction

The GTX 335 units use a single 62 pin D-Sub connector.
Except for the antenna(s) and shield ground, all electrical connections are made through these D-Sub
connectors. Shield grounds are terminated to the shield ground block attached to the backshell of the D-Sub
connectors.
Refer to section 8 for connector pinout information.
Refer to appendix B for interconnect wiring diagrams and cable requirements for each signal.
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GTX 335 w/GPS Installation Guidance
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