• Drift Angle Pointer: Notes:

  The drift angle pointer is controlled by either the IRU or the FMC. With the HSI selector switch in VOR/ILS the source is the IRU and with the switch in NAV the source is the FMC. The inputs from the IRU or the FMC go through the on-side DAA first.

  
  

  1.There is a mask at 6 o’clock. The pointer will stow behind the mask if the source signal is NCD, failed or if the indicator circuit is failed. It is normal for the pointer to be stowed behind the mask on the ground
  
  2.To test the drift angle pointer you can go into IRU bite and run the Interface Test or the FMCS BITE and run the Fixed Output test. These tests should drive the pointer to a fixed test position.
  
  

  3.If the pointer fails to operate for both tests then replace the DAA first and then the indicator. If it passes one test but fails the other its most likely is a source problem with the IRU or FMC.
  
  ADI INFORMATION:

  

  
  Circuit Breakers:

  FMCS CMPTR 1: P18-2 = E8.

  FMCS CMPTR 2: P6-1 = D16.

  F/O XFMR (ALT): P18-2 = B4.

  Capt cmps xfmr (ALT): P6-1 = B12.

  Instrument Transformer 2: P6-1 = A12.

  Instrument Transformer 1: P18-2 = A1.

  DAA FMC #1 DC: P18-2 = C5.

  DAA FMC #1 AC: P18-2 = D1.

  DAA FMC #2 DC: P6-1 = D13.

  DAA FMC #2 AC: P6-1 = D8.

  DAA IRS #1 DC: P18-2 = D3.

  DAA IRS #1 AC: P18-2 = D2.

  DAA IRS #2 DC: P6-1 = D10.

  DAA IRS #2 AC: P6-1 = D9.

  IRS #1 AC: P18-2 = D4.

  IRS #1 DC: P18-2 = D5.

  IRS #2 AC: P6-1 = D11.

  IRS #2 DC: P6-1 = D9.

  
  Applicable deferrals 34-36=Flight Management Computer System,(Source Switch in NAV Mode).
  "No deferral for the IRU".

Training Only