• NAV Control Panel Window Displays (FAIL): Info:
  • The Nav control panel continuous bite monitors the control panel operation. The NAV control panel shows FAIL in the active and standby window when a failure is detected or the panel loses its 115V AC power.
  Nav Control Panel Window Blank: Info:
  • An internal monitor in the NAV control panel monitors the 28V DC input. If the monitor does not see the 28V DC power both the active and standby frequency display windows will be blank.
  
  
  NAV Control Panel Faults Possible Causes:
  

  1.NAV Control Panel

  
  

  2.115V AC power (C/B or wiring)
  
  

  3.28V DC power. (C/B or wiring)
  
  Nav Control Panel Failed:

  

  
  Circuit Breakers:

  NAV Control Panel #1: P18-1 = A3.

  NAV Control Panel #2: P6-1 = A15.

  NAV Sensor DC-1: P18-1 = B1.

  NAV Sensor DC-2: P6-1 = A10.

  
  
  Applicable deferrals MEL 34-17-01 VHF Navigation Systems (#2 VOR System)
  MEL 34-13 Distance Measuring Equipment Systems
  MEL 34-17-05 VHF ILS System
  

Training Only