TASK 24-20-00-810-841
Failure of the APU Feeder
1. Possible Causes
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- 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 GLC APU PIN D, E, F GCU APU PIN B1A, B2B, B3A and the upper ECAM DU warning : APU GEN FAULT:
- do a check of the wiring: . between respectively the APU GCU pins B/1A, B/2B, B/3A and the APU GLC pins F, E, D . then between respectively the APU GEN terminals T/1, T/2, T/3 and the APU GLC pins F, E, 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 A203
201-299, 301-399, Aug 01/05 CES (2) If the wiring is correct:
- do an impedance check of the APU generator stator between terminals T/1, T/2, T/3 and terminal N.
NOTE : The normal impedance between each terminal and the neutral is
____ 9.35 m.ohms plus or minus 1.25 m.ohms at 25.C.
(a) If the impedance is in the specified limits:
- make sure that the pins T/1, T/2, T/3 are electrically insulated from the case
- then, after you have removed the neutral lead, do a check of the pins T/1, T/2 or T/3 for short to ground.
(b) If the impedance is out of the specified limits:
1_ if insulated:
- 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.
2_ If not insulated:
- replace the GEN-APU (8XS) (Ref. AMM TASK 24-23-51-000-001)
and (Ref. AMM TASK 24-23-51-400-001).
- 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 GLC APU PIN D, E, F GCU APU PIN B1A, B2B, B3A and the upper ECAM DU warning : APU GEN FAULT:
- do a check of the wiring: . between respectively the APU GCU pins B/1A, B/2B, B/3A and the module 29XN pins 7, 8, 9 . then between respectively the APU GEN terminals T/1, T/2, 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 an impedance check of the APU generator stator between terminals T/1, T/2, T/3 and terminal N.
NOTE : The normal impedance between each terminal and the neutral is
____ 9.35 m.ohms plus or minus 1.25 m.ohms at 25.C.
「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 A204
201-299, 301-399, Aug 01/05 CES
(a) If the impedance is in the specified limits:
- make sure that the pins T/1, T/2, T/3 are electrically insulated from the case
- then, after you have removed the neutral lead, do a check of the pins T/1, T/2 or T/3 for short to ground.
1 if insulated:
_
- 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.
2 If not insulated:
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本文链接地址：A320 Trouble Shooting Manual 排故手册 电源 1(134)
