• EGPWS Terrain Fail (TERR FAIL) Message: Notes:
  • The amber TERR FAIL message indicates a failure of the enhanced portion of the Ground Proximity Warning Computer and display have failed.
  
  
  • The TERR FAIL can temporarily occur in-flight if the aircraft flies into a GPS no-coverage area. (example: White Sands, New Mexico) Check with Dispatch for information concerning GPS nocoverage areas.
  
  
  • TERR FAIL will show if both GPS antennas are not receiving a signal. (example: aircraft in hangar)
  
  
  
  
  TERR FAIL Message Possible Causes:

  Before replacing any component perform BITE if available. (Push the test switch once for level 1 test, twice for current faults.)

  
  

  1.Ground Proximity Warning Computer

  
  

  2.Wiring

  
  
  EGPWS Terrain Fail:

  

  
  

  

  
  

  

  
  Circuit Breakers:

  GND PROX Warn: P18-1 = B7.

  
  
  Applicable deferrals MEL 34-26-08 Forward Looking Terrain Avoidance function
  MEL 34-26-09 Terrain Display functions

Training Only