• MAP Fail Flag: Notes:
  • The amber MAP flag shows if the map data from the Flight Management Computer (FMC) is invalid. All map data is blanked in this condition. The aircraft symbol, track line, heading select bug, compass rose, GS, TAS, wind direction and speed from the ADIRU will be valid and shown.
    
    
  • The MAP flag will show when the Nav Data Display (ND) is selected to the map and plan modes.
    
  
  
  MAP flag Possible Causes:

  Before replacing any component perform BITE if available. Perform a FMCS bite through the MCDU.

  
  

  1.Flight Management Computer (FMC)

  
  

  2.Wiring
  
  

  3.Toggling the FMC selector to BOTH on 1 then BOTH on 2, back to NORMAL, if no help re-align the ADIRU's.
  
  MAP Flag:

  

  
  

  

  
  Circuit Breakers:

  FMCS CMPTR #1: P18-2 = E8 & A6.

  FMCS CMPTR #2: P6-1 = D16.

  FMCS MCDU-1: P18-2 = A7.

  FMCS MCDU-2: P6-1 = D15.

  
  
  Applicable deferrals MEL 34-36 Flight Management Computer System

  MEL 34-36 MCDU/CDU

  MEL 34-36 FMC Alert Lights

  MEL 34-36 Navigation Database
  

Training Only