Lamp Format 1:
Description: Lamp Format 1 provides EGPWS warning (red) and caution (amber) alert lamp drive logic such that:
.
Only a Mode 5 “Glideslope” alert will activate the caution lamp output (amber).
.
All other alerts (except “windshear” and Mode 6 callouts) will activate the warning lamp output (red).
Modes 1-4, TA
All caution and warning alerts
“SINK RATE, SINK RATE” “PULL UP” “TERRAIN, TERRAIN” “OBSTACLE, OBSTACLE” “CAUTION TERRAIN” “CAUTION OBSTACLE” “TOO LOW TERAIN” “TOO LOW GEAR” “TOO LOW FLAPS” “DON’T SINK”
Mode 5 only
“ GLIDESLOPE”
Lamp Format 2:
Description: Lamp Format 2 provides EGPWS warning (red) and caution (amber) alert lamp drive logic such that:
.
Only the warning alerts containing the phrase “Pull Up” will activate the warning lamp output (red).
.
All other alerts (except “windshear” and Mode 6 callouts) will activate the caution lamp output (amber).
All Modes, TA
“ PULL UP”
All warning alerts
All Modes, TA
All caution alerts
“SINK RATE, SINK RATE”
“TERRAIN, TERRAIN”
“OBSTACLE, OBSTACLE”
“CAUTION TERRAIN”
“CAUTION OBSTACLE”
“TOO LOW TERAIN”
“TOO LOW GEAR”
“TOO LOW FLAPS”
“DON’T SINK”
“GLIDESLOPE”
Note: Actual legends may vary.
EGPWS caution or warning alerts lamp driver outputs are activated for all Mode 1-5 GPWS alerts and Terrain or Obstacle alerts when enabled. Windshear warning and caution alerts activate separate lamp outputs when enabled.
2.3 SYSTEM MAINTENANCE
2.3.1 MAINTENANCE PHILOSOPHY
The EGPWS is an “on-condition” only maintenance system. No scheduled maintenance is required. This is accomplished by both continuous Built-In-Test (BIT) and event initiated test functions. Event initiated test refers to both power-up tests and manually activated Self-Tests. Results of these functions are indicated by system status indicators and messages so that the systems functionality can be assessed.
Detected faults are indicated to the flight crew during normal flight operations by system status annunciators or flight display (EFIS) messages in the cockpit (i.e., GPWS INOP or FAIL, W/S INOP or FAIL, TERR INOP or NOT AVAILABLE). On the ground, system status indications are expanded to direct fault isolation to the fault source whether internal or external to the EGPWC. Several levels of reporting are provided by the EGPWS Self-Test, and multiple means are provided to access the information. The intent is to provide information that will encourage the line mechanic to correct the real problem through clear fault messages and minimal effort.
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本文链接地址：增强型近地警告系统 Enhanced Ground Proximity Warning 航线维护手册 Systems Line Maintenance Manual(17)
