• ALT Fail Flag: Notes:

  The Amber ALT flag replaces the altitude indication. However, baro-correction remains in view.

  
  
  ALT Flag Possible Causes:

  Before replacing any component perform BITE if available(CDS-Current Status, ADIRU-Current Status or inflight Faults).

  
  

  1.ADIRU

  
  

  2.DEU

  
  

  3.Static Air Data Module (ADM)

  
  

  4.Wiring from ADM to ADIRU

  
  

  5.Wiring from the ADIRU to the DEUs

  
  
  ALT Flag:

  

  
  

  

  
  Circuit Breakers:

  ADIRU Left (AC): P18-1 = E7.

  ADIRU Left (DC): P18-1 = E5.

  ADIRU Left EXC: P18-2 = E8.

  ADIRU Right (AC): P6-1 = C14.

  ADIRU Right (DC): P6-1 = C17.

  ADIRU Right EXC: P6-1 = C15.

  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 None

Training Only