W DOC AIRBUS | TSM A320F

Failure of the ELEC/GALLEY Pushbutton Switch Circuit after APU GEN Load Shedding

TASK 24-23-00-810-805-A
Failure of the ELEC/GALLEY Pushbutton Switch Circuit after APU GEN Load Shedding

1. Possible Causes
  • P/BSW-ELEC/GALLEY [2XA]
  • GCU-APU [1XS]
  • diode module 1162VD
  • EGIU-2 [22XU2]
  • wiring
  • GAPCU [24XG]
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
ESPM 2045110
AMM 24-22-33-000-001
Removal of the EGIU-1(2)
AMM 24-22-33-400-002
Installation of the EGIU-1(2)
AMM 24-23-34-000-001
Removal of the GCU-APU
AMM 24-23-34-400-001
Installation of the GCU-APU
ASM 242601
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 24-41-34-000-001
Removal of the Ground Power Control Unit (GPCU)
AMM 24-41-34-400-001
Installation of the Ground Power Control Unit (GPCU)
AIPC 25710104
AMM 31-60-00-860-001
EIS Start Procedure
AMM 49-00-00-860-003
APU Start by External Power
AMM 49-00-00-860-004
APU Shutdown by External Power
AMM 49-00-00-860-005
APU Start by External Power
AMM 49-00-00-860-006
APU Shutdown by External Power
AMM 49-00-00-860-008
APU Start by External Power
AMM 49-00-00-860-009
APU Shutdown by External Power (131-9(A))
3. Fault Confirmation
Subtask 24-23-00-860-050-A
A. Job Set-up
   (1) Energize the aircraft electrical circuits
AMM 24-41-00-861-002.
   (2) Do the EIS start procedure (Upper ECAM DU and lower ECAM DU only)
AMM 31-60-00-860-001.
   (3) Start the APU:
Subtask 24-23-00-710-057-A
B. Test
ACTION
RESULT
1.On the ECAM control panel:
  • push the ELEC key to get the ELEC page.
On the upper ECAM DU:
  • the APU GEN OVERLOAD message comes into view.
2.On the ELEC panel 35VU:
  • release the GALLEY pushbutton switch (2XA).
If on the upper ECAM DU:
  • the APU GEN OVERLOAD message goes out of view, stop the trouble shooting.
    If on the upper ECAM DU:
  • the APU GEN OVERLOAD message stays in view, continue the trouble shooting (refer to the fault isolation which follows).
4. Fault Isolation
Subtask 24-23-00-865-051-A
A. Table of the circuit breakers used in this procedure:
PANELDESIGNATIONFINLOCATION
** ON A/C ALL
122VUELEC/GALY & CAB/CTL1XAS26
122VUELEC/GALY & CAB/FAULT/LT CTL8XAS25
122VUELEC/GCU/12XU1T26
Subtask 24-23-00-810-054-A ** ON A/C NOT FOR ALL
B. If the test confirms the fault:
  • open the circuit breakers 8XA and 1XA
  • replace the P/BSW-ELEC/GALLEY [2XA] ESPM 2045110
  • close the circuit breakers 8XA and 1XA.
   (1) If the fault continues:
     (a) If the fault does not continue:
     (b) If the fault continues:
  • open the circuit breakers 8XA and 1XA
  • disconnect the connector of the diode module 1162VD AIPC 25710104
  • close the circuit breakers 8XA and 1XA.
       1 If the fault does not continue:
  • open the circuit breakers 8XA and 1XA
  • replace the diode module 1162VD AIPC 25710104
  • install the APU GCU (1XS) AMM 24-23-34-400-001
  • close the circuit breakers 8XA and 1XA
       2 If the fault continues:
         a If the fault does not continue:
  • open the circuit breakers 8XA and 1XA
  • connect the connector of the diode module 1162VD AIPC 25710104
  • install the APU GCU (1XS) AMM 24-23-34-400-001
  • close the circuit breakers 8XA and 1XA.
         b If the fault continues:
  • open the circuit breakers 8XA and 1XA
  • do a check and repair the wiring between:
    . the pin A/11 of the diode module 1162VD and the pin AA/13B of the APU GCU (1XS)
    . the pin A/11 of the diode module 1162VD and the pin AB/10A of the EGIU2 (22XU2)
    . the pin A/11 and the pin A/10 of the diode module 1162VD
  • connect the connector of the diode module 1162VD AIPC 25710104
  • install the APU GCU (1XS) AMM 24-23-34-400-001
  • close the circuit breakers 8XA and 1XA.
Subtask 24-23-00-810-054-B ** ON A/C NOT FOR ALL
B. If the test confirms the fault:
  • open the circuit breakers 8XA and 1XA
  • replace the P/BSW-ELEC/GALLEY [2XA]
  • close the circuit breakers 8XA and 1XA.
   (1) If the fault continues:
     (a) If the fault does not continue:
     (b) If the fault continues:
  • open the circuit breakers 8XA and 1XA
  • disconnect the connector of the diode module 1162VD AIPC 25710104
  • close the circuit breakers 8XA and 1XA.
       1 If the fault does not continue:
  • open the circuit breakers 8XA and 1XA
  • replace the diode module 1162VD AIPC 25710104
  • install the GAPCU (24XG) AMM 24-41-34-400-001
  • close the circuit breakers 8XA and 1XA.
       2 If the fault continues:
  • open the circuit breakers 8XA and 1XA
  • do a check and repair the wiring between:
    . the pin A/11 of the diode module 1162VD and the pin AA/6G of the GAPCU (24XG)
    . the pin A/11 and the pin A/10 of the diode module 1162VD ASM 242601
  • connect the connector of the diode module 1162VD AIPC 25710104
  • install the GAPCU (24XG) AMM 24-41-34-400-001
  • close the circuit breakers 8XA and 1XA.
Subtask 24-23-00-710-058-A
C. Do the test given in Para. 3.
5. Close-up
Subtask 24-23-00-860-051-A
A. Put the aircraft back to its initial configuration.
   (1) Stop the APU:
   (2) Put the aircraft back to its initial configuration.
   (3) De-energize the aircraft electrical circuits
AMM 24-41-00-862-002.
[Rev.8 from Aug 2018] 2026.04.04 04:26:39 UTC
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