TABLE 3-4: LEVEL 2 SELF-TEST - EXTERNAL FAULTS
THE FOLLOWING EXTERNAL FAULTS ARE AVAILABLE IN LEVEL 2 SELF-TEST:
Enunciation: “<BUS> Inactive”
Example: GPS BUS 1 Inactive
Probable Cause: Input source is not powered or a wiring problem exists between the source LRU and the EGPWC.
Action: Verify input source LRU is powered. Verify wiring from the source LRU. Verify program pin configuration.
Enunciation: “<BUS><SIGNAL> FAULT”
Example: ILS BUS 1 GLIDESLOPE FAULT
Probable Cause: Input signal SSM = Fail Warning, or Input signal is not being transmitted (incorrect update rate).
Action: Repair input signal.
Enunciation: “<SIGNAL> FAULT ESE”
Probable Cause: External signal is Greater than reasonable
Action: Verify signal scaling
Enunciation: “<BUS> WIRING FAULT”
Example: RADIO ALTIMETER 1 WIRING FAULT
Probable Cause: Open wire monitor has detected no connection from the source LRU.
Action: Verify wiring from the source LRU.
Enunciation: “FLAP SWITCH FAULT”
Probable Cause: Electrical short at the flap discrete input.
Action: Verify wiring from the flap override switch and/or flap input discretes.
Enunciation: “GEAR SWITCH FAULT”
Probable Cause: Electrical short at the gear discrete input.
Action: Verify wiring from the gear override switch and/or gear input discrete.
Enunciation: “AUDIO CANCEL INVALID”
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