R AMM 24-22-34-000-001
R AMM 24-22-34-400-001
R AMM 24-41-00-740-002
R AMM 24-41-34-000-001
R
R AMM 24-41-34-400-001
R
R ASM 24-23/02
R 3. Fault Confirmation
__________________ R A. Test
Removal of the GCU-1(2) (1XU1, 1XU2)
Installation of the GCU-1(2) (1XU1, 1XU2)
Operational Check of GAPCU via CFDS
Removal of the Ground Auxiliary Power Control Unit
(GAPCU) (24XG)
Installation of the Ground Auxiliary Power Control
Unit (GAPCU) (24XG)
R (1) Do the BITE test of the GAPCU (Ref. AMM TASK 24-41-00-740-002).
R 4. Fault Isolation
_______________
R A. If the BITE test gives the maintenance message GCU1 (1XU1) 1553 BUS/
R GAPCU (24XG):
R - replace the GCU-1 (1XU1) (Ref. AMM TASK 24-22-34-000-001) and (Ref. AMM
R TASK 24-22-34-400-001).
R (1) If the fault continues:
R - replace the GAPCU (24XG) (Ref. AMM TASK 24-41-34-000-001) and (Ref.
R AMM TASK 24-41-34-400-001).
R (2) If the fault continues:
R - do a check and repair the wiring of the 1553 data bus (Ref. ASM 24-R 23/02) for an open circuit, a short to ground, a short to shield or
R a short circuit between:
R . pin A/6J of the GCU 1 and pin A/11E of the GAPCU
R . pin A/6H of the GCU 1 and pin A/12E of the GAPCU
R . pins A/11E and A/10E of the GAPCU (short to shield)
R . pins A/12E and A/10E of the GAPCU (short to shield).
「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1 EFF : 401-499, ∞∞24-22-00∞∞∞∞∞∞∞∞∞∞Page 277
Aug 01/05 CES
R B. Do the test given in para. 3.
R TASK 24-22-00-810-830
R Failure of the 1553 Data Bus between GCU 2 and GAPCU
R 1. Possible Causes_______________
R - GCU-2 (1XU2)
R - GAPCU (24XG)
R - wiring
R 2. Job Set-up Information______________________
R A. Referenced Information
R -------------------------------------------------------------------------------
R REFERENCE DESIGNATION
R -------------------------------------------------------------------------------
R AMM 24-22-34-000-001
R AMM 24-22-34-400-001
R AMM 24-41-00-740-002
R AMM 24-41-34-000-001
R
R AMM 24-41-34-400-001
R
R ASM 24-23/02
R 3. Fault Confirmation
__________________ R A. Test
Removal of the GCU-1(2) (1XU1, 1XU2)
Installation of the GCU-1(2) (1XU1, 1XU2)
Operational Check of GAPCU via CFDS
Removal of the Ground Auxiliary Power Control Unit
(GAPCU) (24XG)
Installation of the Ground Auxiliary Power Control
Unit (GAPCU) (24XG)
R (1) Do the BITE test of the GAPCU (Ref. AMM TASK 24-41-00-740-002).
R 4. Fault Isolation
_______________
R A. If the BITE test gives the maintenance message GCU2 (1XU2) 1553 BUS/
R GAPCU (24XG):
R - replace the GCU-2 (1XU2) (Ref. AMM TASK 24-22-34-000-001) and (Ref. AMM
R TASK 24-22-34-400-001).
R (1) If the fault continues:
R - replace the GAPCU (24XG) (Ref. AMM TASK 24-41-34-000-001) and (Ref.
R AMM TASK 24-41-34-400-001).
R (2) If the fault continues:
R - do a check and repair the wiring of the 1553 data bus (Ref. ASM 24-R 23/02) for an open circuit, a short to ground, a short to shield or
R a short circuit between:
R . pin A/6J of the GCU 2 and pin A/11F of the GAPCU
R . pin A/6H of the GCU 2 and pin A/12F of the GAPCU
R . pins A/11F and A/13F of the GAPCU (short to shield)
R . pins A/12F and A/13F of the GAPCU (short to shield).
「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1 EFF : 401-499, ∞∞24-22-00∞∞∞∞∞∞∞∞∞∞Page 279
Aug 01/05 CES
R B. Do the test given in para. 3.
R TASK 24-22-00-810-831
R Failure of the 1553 Data Bus between the GAPCU and the GCU 1 and GCU 2
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