APU Generator Phase Inversion
 1. Possible Causes
_______________
 - GCU-APU (1XS)

 - GEN-APU (8XS)

 - wiring

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 24-23-34-000-001 Removal of the GCU-APU (1XS) AMM 24-23-34-400-001 Installation of the GCU-APU (1XS) 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 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
_______________
 **ON A/C 001-049, 051-062, 101-105, 151-152, 201-205,
 A. If the fault symptom is identified by the CFDS message CHECK GEN APU PHASE SEQ and the upper ECAM DU warning APU GEN FAULT:
 - do a check of the wiring for phase inversion between respectively the APU generator pins T/1, T/2 and T/3 and the APU GLC pins A/F, A/E, A/D (Ref. ASM 24-23/01).
 (1) If the wiring is not correct:
 - repair it.
 「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1R EFF : 001-049, 051-099, 101-149, 151-199, ∞∞24-20-00∞∞∞∞∞∞∞∞∞∞Page 292
 201-299, 301-399, Aug 01/05 CES (2) If the wiring is correct:

 - do a check of the wiring for phase inversion between respectively the APU GCU pins B/1A, B/2B, B/3A and the APU GLC pins A/F, A/E and A/D (Ref. ASM 24-23/01).
 (a) If the wiring is not correct:

 - repair it.

 (b) If the wiring is correct:

 - replace the GCU-APU (1XS) (Ref. AMM TASK 24-23-34-000-001) and (Ref. AMM TASK 24-23-34-400-001).
 NOTE : Do not remove the APU GCU before you do the other steps of
____
 the trouble shooting.

 (3) 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).
 **ON A/C 063-099, 106-149, 153-199, 206-299, 301-399,
 A. If the fault symptom is identified by the CFDS message CHECK GEN APU PHASE SEQ and the upper ECAM DU warning APU GEN FAULT:
 - do a check of the wiring for phase inversion between respectively the APU generator pins T/1, T/2 and T/3 and the module 29XN pins 7, 8, 9 (Ref. ASM 24-23/01).
 (1) If the wiring is not correct:

 - repair it.

 (2) If the wiring is correct:

 - do a check of the wiring for phase inversion between respectively the APU GCU pins B/1A, B/2B, B/3A and the module 29XN pins 7, 8, 9 (Ref. ASM 24-23/01).
 (a) If the wiring is not correct:

 - repair it.

 (b) If the wiring is correct:

 - replace the GCU-APU (1XS) (Ref. AMM TASK 24-23-34-000-001) and (Ref. AMM TASK 24-23-34-400-001).
 NOTE : Do not remove the APU GCU before you do the other steps of
____
 the trouble shooting.

 (3) 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).
 「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1R EFF : 001-049, 051-099, 101-149, 151-199, ∞∞24-20-00∞∞∞∞∞∞∞∞∞∞Page 293
 201-299, 301-399, Aug 01/05 CES

R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 301-399,

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

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

 「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1R EFF : 001-049, 051-099, 101-149, 151-199, ∞∞24-20-00∞∞∞∞∞∞∞∞∞∞Page 294
 201-299, 301-399, Aug 01/05 CES

 TASK 24-20-00-810-838

 Failure of the Internal Circuit Breaker of the APU GCU
 1. Possible Causes
_______________
 - GCU-APU (1XS)

 - wiring
　
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