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 GCU2 (1XU2) comes into view: 
R  - replace the GCU-2 (1XU2) (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 2 (Ref. ASM 24-
R  21/01). 
R  (1) If there is no continuity: 
R  - replace the engine 2 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 for an open circuit (Ref. 
R  ASM 24-21/01) between: 
R  . pin C/A of the IDG 2 and pin A/4A of the GCU 2 
R  . pin C/B of the IDG 2 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-2 (1XU2) (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 24-21-00-810-832 
R  Failure of the IDG 1 Oil-In Temperature Bulb or its Wiring to the GCU 1 
R  1. Possible Causes_______________ 
R  - IDG (4000XU) 
R  - GCU-1 (1XU1) 
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) Read the Class 3 Faults of the GAPCU from the CFDS (Ref. AMM TASK 24-R 41-00-740-002).
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 Class 3 Faults gives the maintenance message IDG1 (E1-4000XU) OIL
R IN TEMP/ GCU1 (1XU1):
R - do an electrical resistance test of the inlet oil temperature-sensor of
R the IDG 1 between pins B/8 and B/9 (100 ohms plus or minus 10 ohms at
R the ambient temperature of the IDG case) (Ref. ASM 24-21/01).

R (1) If the resistance values are out of the specified limits:
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).

 「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 278
 Aug 01/05 CES

R  (2) If the resistance values are in the specified limits: 
R  - do a check of the wiring (Ref. ASM 24-21/01) for an open circuit, a 
　
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