• LOC and G/S No Computed Data (NCD): Notes:
  • The Localizer and Glideslope deviation pointers are removed. The scales remain in view on the ADI, and Nav Data Display.The ILS frequency on the associated Nav Data Display changes to dashes.
  
  
  • To display NCD for the Glideslope and Localizer an ILS frequency must be tuned on the associated Nav Control Panel, and the Nav Data Display must be set to APP.
  
  
  LOC and/or G/S NCD Possible Causes:

  Before replacing any component perform BITE if available. (MMR bite check in main E&E.)

  
  

  1.MMR.

  
  

  2.NAV Control Panel.

  
  

  3.Glideslope or Localizer Antenna.

  
  

  4.Localizer Antenna Switching Relays (R315, R316).

  
  

  5.Wiring from NAV Control Panel to MMR.

  
  

  6.Wiring from Antenna to MMR.

  
  

  7.No signal/ground station out of range.

  
  
  LOC and/or G/S NCD:

  

  
  

  

  
  Circuit Breakers:

  MMR#1/ILS#1: P18-1 = A2.

  MMR#2/ILS#2: P6-1 = A13.

  
  

  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.

  
  

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

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

  AFCS MCP DC1: P18-1 = D5.

  AFCS MCP DC2: P6-2 = C3.

  AFCS SYS A Engaged INTLK: P18-1 = D3.

  AFCS SYS B Engaged INTLK: P6-2 = B4.

  AFCS SYS A SNSR EXC AC: P18-1 = C5.

  AFCS SYS B SNSR EXC AC: P6-2 = C2.

  AFCS SYS A Warning Light BAT: P18-1 = D1.

  AFCS SYS B Warning Light BAT: P6-2 = B1.

  
  

  ADIRU Right AC: P6-1 = C14.

  ADIRU Right EXC: P6-1 = C15.

  ADIRU Right DC: P6-1 = C17.

  ADIRU Left AC: P18-1 = E7.

  ADIRU Left EXC: P18-2 = E8.

  ADIRU Left DC: P18-1 = E5.

  INSTER XFER: P18-2 = A2 & E2.

  
  

  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 MEL 34-17 = VHF Navigation Systems (ILS)
  

Training Only