• FD Flag: Notes:

  Check for a Valid onside Radio Altimeter. A invalid RA will cause the onside flight director to bias out of view with a PSEU light on the ground.

  
  

  The Amber Flight Director (FD) Flag shows when the on-side flight director function of the Flight Control Computer (FCC) has Failed.

  
  

  Both the Captains and First Officers FD flag will show when the loadable software between FCC A and B do not match.

  
  

  The FD flag will also show when the FCCs are in BITE.

  
  
  Flight Director Flag Possible Causes:

  Before replacing any component perform BITE if available.(DFCS/Fault Review/Current Status/Channel?/Flight Director) or library test 10 for the FCC.

  
  

  1.Flight Control Computer (FCC)

  
  
  FD Flag:

  

  
  

  

  
  Circuit Breakers:

  AFCS SYS A FCC (DC): P18-1 = D2.

  AFCS SYS B FCC (DC): P6-2 = B3.

  AFCS SYS A SENSOR (AC): P18-1 = C5.

  AFCS SYS B SENSOR (AC): P6-2 = C2.

  AFCS SYS A INTERLOCK: P18-1 = D3.

  AFCS SYS B INTERLOCK: P6-2 = B4.

  AFCS MCP DC1: P18-1 = D5.

  AFCS MCP DC2: P6-2 = C3.

  
  
  Applicable deferrals MEL 34-12 = Flight Director

Training Only