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) On the ELEC panel 35VU, do a check of the position of the BUS TIE
R pushbutton switch (10XU) when the CFDS message PB SW BUS TIE (10XU)/
R GAPCU (24XG) comes into view.
R (a) If the BUS TIE pushbutton switch (10XU) is released:
R - stop the trouble shooting.
R (b) If the BUS TIE pushbutton switch (10XU) is pushed:
R - do the BITE test of the GAPCU (Ref. AMM TASK 24-41-00-740-002).
R 1_ If the BITE test gives the message TEST FAILED:
R - do the trouble shooting given in Para 4.A.
R 2_ If the BITE test gives the message TEST PASSED:
R - do the trouble shooting given in Para 4.B.
「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 281
Aug 01/05 CES
R 4. Fault Isolation_______________
R A. If the BITE test gives the message TEST FAILED:
R - push the line key adjacent to the TEST FAILED message.
R (1) If the maintenance message GAPCU (24XG) comes into view:
R - replace the GAPCU (24XG) (Ref. AMM TASK 24-41-34-000-001) and (Ref.
R AMM TASK 24-41-34-400-001).
R B. If the BITE test gives the message TEST PASSED:
R - do a check of the wiring of the 1553 data bus (Ref. ASM 24-23/02) for
R an open circuit, a short to ground, a short to shield or a short
R 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 . 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 (1) If the wiring is not correct:
R - repair or replace as necessary.
R (2) If the wiring is correct:
R - replace the GCU-1 (1XU1) and the GCU-2 (1XU2) (Ref. AMM TASK 24-22-
R 34-000-001) and (Ref. AMM TASK 24-22-34-400-001).
R C. Do the test given in para. 3.
R **ON A/C 106-149, 229-299, 303-399, 401-499,
R TASK 24-22-00-810-832
R Failure of the IDG Oil Level Sensor
R 1. Possible Causes_______________
R 2. Job Set-up Information______________________
R A. Referenced Information
R -------------------------------------------------------------------------------
R REFERENCE DESIGNATION
R -------------------------------------------------------------------------------
R AMM 24-22-34-000-001 Removal of the GCU-1(2) (1XU1, 1XU2)
R AMM 24-22-34-400-001 Installation of the GCU-1(2) (1XU1, 1XU2)
R AWM 24-22-08
R 3. Fault Confirmation__________________
R A. Not Applicable
R 4. Fault Isolation_______________
R A. If the CFDS POST FLIGHT REPORT or the EPGS GROUND REPORT gives the
R maintenance message IDGx(Ex-4000XU)OIL LEVEL SENSOR/GCUx(1XUx):
R - replace the GCUx (Ref. AMM TASK 24-22-34-000-001) and (Ref. AMM TASK
R 24-22-34-400-001) and send the faulty GCU to Hamilton Sundstrand for
R investigation .
R (1) If the fault continues:
R - do a check of the wiring and make sure that the pin AA/5E of the
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