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Action:  Remove aircraft from hanger and wait 5 to 20 minutes for the GPS/GNSSU acquire a sufficient number of satellites. Verify cabling and antenna connection for the GPS/GNSSU. 
Enunciation:  “TERRAIN AWARENESS NO VALID LONGITUDE” 
Probable Cause:  GPS/GNSSU has not acquired a sufficient number of satellites. 
Action:  Remove aircraft from hanger and wait 5 to 20 minutes for the GPS/GNSSU acquire a sufficient number of satellites.  Verify cabling and antenna connection for the GPS/GNSSU. 
Enunciation:  “TERRAIN INOP” 
Probable Cause:  GPS/GNSSU has not acquired a sufficient number of satellites. 
Action:  Remove aircraft from hanger and wait 5 to 20 minutes for the GPS/GNSSU to acquire sufficient number of satellites.  Verify cabling and antenna connection for the GPS/GNSSU. 
Description:  “TERRAIN AWARENESS-POSITION ERROR” 
Probable Cause:  GPS/GNSSU has not acquired a sufficient number of satellites or ARINC [743A / 743] setting incorrect. 
Action:  Remove aircraft from hanger and wait 5 to 20 minutes for the GPS/GNSSU to acquire sufficient number of satellites.  Verify cabling and antenna connection for the GPS/GNSSU. Verify correct 743A / 743 configuration. 
Enunciation:  “TERRAIN CLEARANCE FLOOR POSITION ERROR” 
Probable Cause:  GPS/GNSSU has not acquired a sufficient number of satellites or ARINC [743A / 743] setting incorrect. 
Action:  Remove aircraft from hanger and wait 5 to 20 minutes for the GPS/GNSSU to acquire sufficient number of satellites.  Verify cabling and antenna connection for the GPS/GNSSU. Verify correct 743A / 743 configuration. 

 

 

EGPWS LINE MAINTENANCE MANUAL

3.5 LEVEL 3 SELF-TEST - SYSTEM CONFIGURATION
A Level 3 Self-Test enunciates EGPWC configuration information.  Level 3 is accessed while the aircraft is on the ground by pressing the EGPWS test switch within 3 seconds of the “PRESS TO CONTINUE” message at the end of the Level 2 test.  The message “SYSTEM CONFIGURATION” will be enunciated when Level 3 starts.
During a Level 3 Self-Test, a short cancel bumps the enunciation to the next Level 3 item (e.g. from terrain database information to envelope modulation database information). A long cancel terminates the Self-Test level and “PRESS TO CONTINUE” is enunciated for proceeding to Level 4 Self-Test.
TABLE 3-6: LEVEL 3 SELF-TEST INFORMATION

THE FOLLOWING INFORMATION IS GIVEN IN THE LEVEL 3 SELF-TEST: 
1.  Part Number 
2.  Mod Status 
3.  Serial Number 
4.  Application Software Version 
5.  Configuration Software Version 
6.  Terrain Database Version 
7.  Envelope Modulation Database Version 
　
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本文鏈接地址：增強型近地警告系統 Enhanced Ground Proximity Warning 航線維護手冊 Systems Line Maintenance Manual(29)