Failure of the Phase A of the APU Generator
 1. Possible Causes
_______________
 - GEN-APU (8XS)

 - GAPCU (24XG)

 - feeder

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------
REFERENCE DESIGNATION
 -------------------------------------------------------------------------------
AMM 24-23-51-000-001 Removal of the APU Generator 8XS
 AMM 24-23-51-400-001 Installation of the APU Generator 8XS
 AMM 24-41-00-861-002 Energize the Aircraft Electrical Circuits from the

 APU AMM 24-41-00-862-002 De-energize the Aircraft Electrical Circuits Supplied from the APU AMM 24-41-34-000-001 Removal of the Ground Auxiliary Power Control Unit (GAPCU) (24XG) AMM 24-41-34-400-001 Installation of the Ground Auxiliary Power Control Unit (GAPCU) (24XG) ASM 24-23/01
 3. Fault Confirmation
__________________
 A. Test
 Not applicable.

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

 4. Fault Isolation
_______________
 A. If the fault symptom is identified by the CFDS message WRG: GEN APU FEEDER PHASE A/ GEN APU (8XS) and the upper ECAM-DU warning APU GEN FAULT:
 - do a check of the resistance of the phase A of the APU generator between terminal T1 and N (9.35 milliohms plus or minus 1.25 milliohm) (Ref. ASM 24-23/01).
 (1) If the resistance values are out of the specified limits:
 - replace the GEN-APU (8XS) (Ref. AMM TASK 24-23-51-000-001) and (Ref. AMM TASK 24-23-51-400-001).
 「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 : 106-149, 229-299, 303-399, 401-499, ∞∞24-23-00∞∞∞∞∞∞∞∞∞∞Page 249
 Aug 01/05 CES (2) If the resistance values are in the specified limits:

 - do a check of the feeder for an open circuit or a high resistance condition between the terminal T1 of the APU generator and the terminal F of the APU GLC contactor (3XS) (Ref. ASM 24-23/01).
 (a) If the feeder is not correct:

 - repair or replace the feeder as necessary.

 (b) If the feeder is correct:

 - replace the GAPCU (24XG) (Ref. AMM TASK 24-41-34-000-001) and (Ref. AMM TASK 24-41-34-400-001).
 1_ If the fault continues:
 - replace the GEN-APU (8XS) (Ref. AMM TASK 24-23-51-000-001)
 and (Ref. AMM TASK 24-23-51-400-001).

 B. Make sure that the aircraft electrical circuits operate correctly in APU configuration.
 (1) Energize the aircraft electrical circuits from the APU (Ref. AMM TASK 24-41-00-861-002).

 (2) Let the APU generator operate for five minutes.

 (3) De-energize the aircraft electrical circuits from the APU (Ref. AMM TASK 24-41-00-862-002).

 TASK 24-23-00-810-824
 Failure of the Phase B of the APU Generator
 1. Possible Causes
_______________
 - GEN-APU (8XS)

 - GAPCU (24XG)

 - feeder

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------
REFERENCE DESIGNATION
 -------------------------------------------------------------------------------
AMM 24-23-51-000-001 Removal of the APU Generator 8XS
 AMM 24-23-51-400-001 Installation of the APU Generator 8XS
 AMM 24-41-00-861-002 Energize the Aircraft Electrical Circuits from the

 APU AMM 24-41-00-862-002 De-energize the Aircraft Electrical Circuits Supplied from the APU AMM 24-41-34-000-001 Removal of the Ground Auxiliary Power Control Unit (GAPCU) (24XG) AMM 24-41-34-400-001 Installation of the Ground Auxiliary Power Control Unit (GAPCU) (24XG) ASM 24-23/01
 3. Fault Confirmation
__________________
 A. Test
 Not applicable.

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

 4. Fault Isolation
_______________
 A. If the fault symptom is identified by the CFDS message WRG: GEN APU FEEDER PHASE B/ GEN APU (8XS) and the upper ECAM-DU warning APU GEN FAULT:
 - do a check of the resistance of the phase B of the APU generator between terminal T2 and N (9.35 milliohms plus or minus 1.25 milliohm) (Ref. ASM 24-23/01).
 (1) If the resistance values are out of the specified limits:
 - replace the GEN-APU (8XS) (Ref. AMM TASK 24-23-51-000-001) and (Ref. AMM TASK 24-23-51-400-001).
　
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