R 4. Fault Isolation
_______________

R  A. If the fault symptom is identified by the CFDS message ECB (59KD)/APU 
R  (4005KM)/GAPCU (24XG) and the upper ECAM-DU warning APU GEN FAULT: 
R  - replace the GAPCU (24XG) (Ref. AMM TASK 24-41-34-000-001) and (Ref. AMM 
R  TASK 24-41-34-400-001). 
R  (1) If the fault continues: 
R  - replace the GEN-APU (8XS) (Ref. AMM TASK 24-23-51-000-001) and 
R  (Ref. AMM TASK 24-23-51-400-001). 
R  B. Make sure that the aircraft electrical circuits operate correctly in APU 
R  configuration. 
R  (1) Energize the aircraft electrical circuits from the APU (Ref. AMM TASK 
R  24-41-00-861-002). 
R  (2) Let the APU generator operate for five minutes to make sure that it 
R  operates correctly. 
R  (3) De-energize the aircraft electrical circuits from the APU (Ref. AMM 
R  TASK 24-41-00-862-002).

R **ON A/C 106-149, 229-299, 303-399, 401-499,
 TASK 24-20-00-810-949
 Failure of the IDG 1 Disconnection Function or the IDG 1 PMG Stator or its Wiring to the GCU 1
 1. Possible Causes
_______________
 - IDG (4000XU)

 - GCU-1 (1XU1)

 - wiring

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 24-21-51-000-040 Removal of the Integrated Drive Generator -IDG 1(2),(4000XU) AMM 24-21-51-400-040 Installation of the Integrated Drive Generator -IDG
 1(2),(4000XU) AMM 24-22-34-000-001 Removal of the GCU-1(2) (1XU1, 1XU2) AMM 24-22-34-400-001 Installation of the GCU-1(2) (1XU1, 1XU2) AMM 24-41-00-740-002 Operational Check of GAPCU via CFDS AMM 24-41-00-861-002 Energize the Aircraft Electrical Circuits from the
 External Power AMM 24-41-00-862-002 De-energize the Aircraft Electrical Circuits Supplied

 from the External Power
 AMM 31-60-00-860-001 EIS Start Procedure
 AMM 31-60-00-860-002 EIS Stop Procedure
 AMM 71-00-00-710-003 Engine Automatic Start
 AMM 71-00-00-710-028 Engine Shutdown
 ASM 24-22/01

 3. Fault Confirmation
__________________
 A. Test
 Not applicable.

 NOTE : As the GEN 1 was set to OFF because of a true failure, the fault
____
 confirmation is not necessary.

 4. Fault Isolation
_______________
 CAUTION : BEFORE YOU START THE CHECK OF IDG WIRING THAT INCLUDES CONNECTORS,
_______ EXAMINE EACH CONNECTOR TO MAKE SURE THAT THERE IS NO OIL IN IT. IF YOU FIND OIL, CLEAN THE CONNECTOR AND CONNECT IT AGAIN. IF THE FAILURE CONTINUES, DO THE TROUBLE SHOOTING PROCEDURE AS GIVEN BELOW.
 A. If the fault symptom is identified by the CFDS message IDG DISC/ IDG1 (E1-4000XU) PMG/ GCU1 (1XU1) and the upper ECAM-DU warning GEN 1 FAULT:
 NOTE : Before you do the trouble shooting for this fault, do a check of
____ the log book and the CFDS for messages related to IDG 1 thermal or manual disconnection messages.
 (1) If there was a thermal or manual disconnection of the IDG 1:

 - replace the engine 1 IDG (4000XU) (Ref. AMM TASK 24-21-51-000-040) and (Ref. AMM TASK 24-21-51-400-040).

 (2) If there is no sign of thermal or manual disconnection of the IDG:

 - do a check of the CFDS for messages related to the ECU engine-speed sense-function. Do the trouble shooting for CFDS messages related to the ECU.

 (3) If there is no message or no disconnection:

 - do a check of the resistance of the IDG 1 PMG stator (Ref. ASM 24-22/01) between: . pins B/12 and B/13 (1 ohm plus or minus 0.05 ohm) . pins B/12 and B/14 (1 ohm plus or minus 0.05 ohm) . pins B/13 and B/14 (1 ohm plus or minus 0.05 ohm).
 (a) If the resistance values are out of the specified limits:

 - replace the engine 1 IDG (4000XU) (Ref. AMM TASK 24-21-51-000-040) and (Ref. AMM TASK 24-21-51-400-040).

 (b) If the resistance values are in the specified limits:

 - do a check of the wiring of the IDG 1 PMG stator (Ref. ASM 24-22/01) for a short circuit, an open circuit, a short to ground or a short to shield between: . pin B/12 of the IDG 1 and pin C/10 of the GCU 1 . pin B/13 of the IDG 1 and pin C/11 of the GCU 1 . pin B/14 of the IDG 1 and pin C/9 of the GCU 1 . pins C/10, C/11, C/9 and pin C/7 of the GCU 1 (short to shield of the PMG wiring).
 1 If the wiring is not correct:
_ - repair or replace as necessary.
　
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