「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, ∞∞24-21-00∞∞∞∞∞∞∞∞∞∞Page 274
Aug 01/05 CES
R 4. Fault Isolation
_______________
R CAUTION : BEFORE YOU START THE CHECK OF IDG WIRING THAT INCLUDES CONNECTORS,_______
R EXAMINE EACH CONNECTOR TO MAKE SURE THAT THERE IS NO OIL IN IT.
R IF YOU FIND OIL, CLEAN THE CONNECTOR AND CONNECT IT AGAIN.
R IF THE FAILURE CONTINUES, DO THE TROUBLE SHOOTING PROCEDURE AS
R GIVEN BELOW.
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 GCU1 (1XU1) comes into view:
R - replace the GCU-1 (1XU1) (Ref. AMM TASK 24-22-34-000-001) and (Ref.
R AMM TASK 24-22-34-400-001).
R B. If the BITE test gives the message TEST PASSED:
R - do a check of the low-oil pressure switch for an open circuit between
R the pins C/A and C/B (normally closed) of the IDG 1 (Ref. ASM 24-
R 21/01).
R (1) If there is no continuity:
R - replace the engine 1 IDG (4000XU) (Ref. AMM TASK 24-21-51-000-040)
R and (Ref. AMM TASK 24-21-51-400-040).
R (2) If there is continuity:
R - do a check of the low-oil pressure wiring (Ref. ASM 24-21/01) for
R an open circuit between:
R . pin C/A of the IDG 1 and pin A/4A of the GCU 1
R . pin C/B of the IDG 1 and ground.
R (a) If the wiring is not correct:
R - repair or replace as necessary.
R (b) If the wiring is correct:
R - replace the GCU-1 (1XU1) (Ref. AMM TASK 24-22-34-000-001) and
R (Ref. AMM TASK 24-22-34-400-001).
R C. When you replace a component or repair the wiring:
R - do the subsequent flight before you do the check of the Class 3 Faults
R of the GAPCU from the CFDS to make sure that the system operates
R correctly.
R If the test continues to give the fault message, continue the trouble
R shooting procedure.
R TASK 24-21-00-810-831
R Failure of IDG 2 Low-Oil Pressure Switch or its Wiring
R 1. Possible Causes_______________
R - GCU-2 (1XU2)
R - IDG (4000XU)
R - wiring
R 2. Job Set-up Information______________________
R A. Referenced Information
R -------------------------------------------------------------------------------
R REFERENCE DESIGNATION
R -------------------------------------------------------------------------------
R AMM 24-21-51-000-040
R
R AMM 24-21-51-400-040
R
R AMM 24-22-34-000-001
R AMM 24-22-34-400-001
R AMM 24-41-00-740-002
R ASM 24-21/01
R 3. Fault Confirmation
__________________ R A. Test
Removal of the Integrated Drive Generator -IDG
1(2),(4000XU)
Installation of the Integrated Drive Generator -IDG
1(2),(4000XU)
Removal of the GCU-1(2) (1XU1, 1XU2)
Installation of the GCU-1(2) (1XU1, 1XU2)
Operational Check of GAPCU via CFDS
R (1) Do the BITE test of the GAPCU (Ref. AMM TASK 24-41-00-740-002).
R NOTE : The CFDS message IDG2 (E2-4000XU) LOP SW/ GCU2 (1XU2) can come
____ R into view if the electrical connector C is disconnected from R the IDG and the 28VDC backup power supplies the related GCU. R Before you do the trouble shooting procedure for this CFDS R message, make sure that the electrical connector C is not R disconnected. R This CFDS message can also come into view during engine R motoring, or "dry cranking", then no trouble shooting is R necessary and you can ignore the message. R In other conditions, do the trouble shooting procedure that R follows:
R (a) If the BITE test gives the message TEST FAILED: R - do the trouble shooting given in Para 4.A.
R (b) 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, ∞∞24-21-00∞∞∞∞∞∞∞∞∞∞Page 276
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