增强型近地警告系统 Enhanced Ground Proximity Warning 航线维护手册 Systems Line Maintenance Manual(26)

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AUDIO CANCEL INVALID  Discrete selected for > 30 seconds. 
TERRAIN INHIBIT INVALID  Discrete selected for > 60 seconds. 
GPWS INHIBIT INVALID  Discrete selected for > 60 seconds. 
ALL MODES INHIBIT INVALID  Discrete configured to suppress both audio and visual outputs and selected for > 60 seconds. Or if aircraft type is configured for ‘Audio Inhibit Monitoring’ then activation for > 60 seconds to inhibit only audio will cause this fault. 
GLIDESLOPE CANCEL INVALID  Discrete selected for > 15 seconds. 
ILS SELECT INVALID  More than 1 discrete selected for > 5 seconds. 
FLAP ANGLE UNREASONABLE  Invalid combination selected for > 30 seconds. 
RANGE UNREASONABLE  No valid range provided for > 5 seconds. 
SELF-TEST INVALID  Discrete selected for > 60 seconds. 
AIR GROUND INVALID  Indicates On-Ground for > 60 seconds with an airspeed > 290 knots. 
MOMENTARY TERRAIN SELECT 1 (or 2) INVALID  Selected for > 15 seconds. 

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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