• TERRAIN RANGE DISAGREE Message: Notes:
  • The amber TERR RANGE DISAGREE message shows when the GPWC range data to the DEU disagrees with the on-side EFIS Control Panel setting. This will only display when the DEU expects terrain data from the GPWC (when the EFIS TERR button is pressed).
  
  
  
  
  TERRAIN RANGE DISAGREE Message Possible Cause:

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

  
  

  1.Ground Proximity Warning Computer

  
  

  2.EFIS Control Panel
  
  

  3.DEU
  
  

  3.Wiring
  
  TERRAIN RANGE DISAGREE Message:

  

  
  

  

  
  

  

  
  

  

  
  Circuit Breakers:

  GND PROX Warn: P18-1 = B7.

  
  

  Nav Control Panel #1: P18-1 = A3.

  Nav Control Panel #2: P6-1 = A15.

  Nav Sensor DC-1: P18-1 = B1.

  Nav Sensor DC-2: P6-1 = A10.

  
  

  DEU#1 HOLD UP: P6-1 = D10.

  DEU#1 PRIMARY: P18-2 = D5.

  DEU#2 HOLD UP: P6-1 = D9.

  DEU#2 PRIMARY: P6-1 = D11.

  
  
  Applicable deferrals MEL 34-26-09 Terrain Display functions

Training Only