• RADIO ALTIMETER (RA) Fail Flag: Notes:
  • Invalid RA data causes an amber RA flag to show in the radio altitude position. Invalid RA also causes the rising runway symbol to be removed, and the associated flight directors will bias out of view with the PSEU light illuminated on landing. The invalid data occurs when the RA Receiver/Transmitter finds a failure in the RA system.
  
  
  RA Flag Possible Causes:

  Before replacing any component perform BITE if available. (R/A R/T bite check in main E&E)

  
  

  1.RA Receiver/Transmitter.

  
  

  2.Antenna.

  
  

  3.Wiring from the RA Receiver/Transmitter to the DEUs.

  
  
  RADIO ALTIMETER (RA) Fail Flag:

  

  
  

  

  
  Circuit Breakers:

  R/A #1: P18-1 = B2.

  R/A#2: P6-1 = A16.

  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 34-20 Radio Altimeter System
  

Training Only