190-01182-02 GTR 225/GNC 255 TSO Installation Manual
Rev. B Page 3-3
3.4 Cabling and Wiring Considerations
Wiring should be installed in accordance with AC 43.13-1B Chapter 11. For dual GTR/GNC unit
installations, care should be taken to ensure separation between wires of redundant systems to reduce the
possibility of loss of navigation due to a single event. When wire separation cannot be achieved, the
following issues should be addressed:
It should not be possible for a cable harness to be exposed to wire chafing in a manner that both
units fail simultaneously;
The cable harness should not be located near flight control cables and controls, high voltage lines
or fuel lines;
The cable harness should be located in a protected area of the aircraft (e.g., isolated from engine
rotor burst); and
Do not route cable near high voltage sources.
Pigtail lengths should be less than 3.0 inches. Wiring which is required to be shielded must
be shielded per Appendix D.
Refer to Section 4.4.2 and Section 4.5 for connector and tooling information.
Refer to Section 4.6 for recommended coax cable.
Refer to Appendix D for the appropriate wiring connections to assemble the wiring connector.
Once the cable assemblies have been made, attach the cable connectors to the rear connector plate. After
installing the mounting tube, attach the assembled connector plate. Route the wiring bundle as appropriate.
Use 22 or 24 AWG wire for all connections. For power and ground, use the wire gauge specified in the
interconnect drawing, then 22 AWG for the short length from the splice to the connector. Avoid sharp
bends.
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