• TAT Missing: INFO:

  Total air temperature (TAT) from the ADIRUs shows on the top of the engine display. The TAT value that shows is from the left ADIRU. When the left ADIRU TAT is invalid, the right ADIRU TAT value shows. TAT goes out of view when the data from both ADIRUs is invalid.

  
  
  Note:

  If both elements of the TAT probe fail, and the N1 set knob on the P2 panel is in AUTO, the N1 bugs will dive to zero when the aircraft climbs above field elevation.

  
  
  TAT Missing Possible Causes:

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

  
  

  1.TAT probe (both elements)

  
  

  2.ADIRU

  
  
  TAT Missing Info:

  

  
  

  

  
  Circuit Breakers:

  TAT: P18-2 = A7.

  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.

  
  
  Applicable deferrals MEL 34-05-01 = Total Air Temperature Indication
  

Training Only