• Marker Beacon (MB) Indication Will Not Display: Notes:
  • If the Marker Beacon data fails or is no computed data (NCD), there will be no display on both the Captain and F/O ADI.
  
  
  MB Indication Will Not Display Possible Causes:

  Before replacing any component perform BITE if available. (VOR/MB Receiver #1 bite check.)

  
  

  1.#1 VOR/MB Receiver

  
  

  2.DEU.

  
  

  3.Wiring from the #1 VOR/MB Receiver to the DEUs

  
  
  No MB Audio Tone Possible Causes:

  Before replacing any component perform BITE if available. (VOR/MB Receiver #1 bite check in main E&E.)

  
  

  1.#1 VOR/MB Receiver

  
  

  2.Remote Electronics Unit (REU).

  
  

  3.Wiring.

  
  
  Marker Beacon (MB) Indication Will Not Display:

  

  
  

  

  
  Circuit Breakers:

  Radio Navigation VOR/MKR BCN 1: P18-1 = A1.

  
  

  Capt Audio (REU PWR): P6-2 = D23.

  F/O Audio (REU PWR): P6-2 = D22.

  OBS Audio (REU PWR): P6-2 = D24.

  INTPH And Warn (REU PWR): P6-2 = D21.

  
  

  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 34-14 Marker Beacon Receiver System
  

Training Only