W DOC AIRBUS | TSM A320F

Failure of the APU GLC Contactor in Closed Position

TASK 24-23-00-810-826-A
Failure of the APU GLC Contactor in Closed Position

1. Possible Causes
  • MODULE DIODE UNIT [1164VD]
  • GLC-APU [3XS]
  • RELAY-APU GLC AUX CTL [4XS]
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
ASM 242302
AMM 24-23-55-000-001
Removal of the APU GLC
AMM 24-23-55-400-001
Installation of the APU GLC
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
3. Fault Confirmation
Subtask 24-23-00-869-065-A ** ON A/C NOT FOR ALL
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
Subtask 24-23-00-810-079-A ** ON A/C NOT FOR ALL
A. If the fault symptom is identified by the CFDS message GLC APU (3XS)/ RELAY (4XS) and the upper ECAM-DU warning APU GEN FAULT:
   (1) Do a check of the diode module (1164VD) between pins A/44 and A/43 ASM 242302.
     (a) If the diode module is not correct:
  • Replace the MODULE DIODE UNIT [1164VD] .
     (b) If the diode module is correct:
   (2) If the fault continues:
  • Replace the RELAY-APU GLC AUX CTL [4XS] .
Subtask 24-23-00-810-079-B ** ON A/C NOT FOR ALL
A. If the fault symptom is identified by the CFDS message GLC APU (3XS)/ RELAY (4XS) and the upper ECAM-DU warning APU GEN FAULT:
   (1) If the fault continues:
  • Replace the RELAY-APU GLC AUX CTL [4XS] .
Subtask 24-23-00-860-067-A ** ON A/C NOT FOR ALL
B. Make sure that the aircraft electrical circuits operate correctly in APU configuration.
   (1) Energize the aircraft electrical circuits from the APU AMM 24-41-00-861-002.
   (2) Let the APU generator operate for five minutes.
   (3) De-energize the aircraft electrical circuits from the APU AMM 24-41-00-862-002.
[Rev.8 from Aug 2018] 2026.04.04 04:26:41 UTC
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