W DOC AIRBUS | TSM A320F

APU Generator Overload

TASK 24-20-00-810-944-A
APU Generator Overload

1. Possible Causes
  • wiring
  • feeders
  • GAPCU [24XG]
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
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)
3. Fault Confirmation
Subtask 24-20-00-700-123-A ** ON A/C NOT FOR ALL
A. Test
NOTE: Make sure that the cause of the overload is not a load added to the normal load because then, the total load will be more than the maximum permitted load. If this occurs, no trouble shooting is necessary.
   (1) Energize the aircraft electrical circuits from the APU AMM 24-41-00-861-002.
     (a) On the upper ECAM DU, the warning GEN APU OVERLOAD is shown and the APU generator or the external power trips.
4. Fault Isolation
Subtask 24-20-00-810-221-A ** ON A/C NOT FOR ALL
A. If the test confirms the fault:
  • do a check of the circuit breakers related to the loads from the APU generator.
   (1) If the circuit breakers are open:
  • do a check and repair the wiring and the related equipment for a short circuit or a short to ground.
   (2) If the circuit breakers are closed:
  • do a check and repair the feeders of the AC 1 (1XP) and AC 2 (2XP) bus bar for a short to ground, or a short circuit.
     (a) If the fault continues:
Subtask 24-20-00-860-194-A ** ON A/C NOT FOR ALL
B. Do this procedure to make sure that the system operates correctly:
   (1) Energize the aircraft electrical circuits from the APU AMM 24-41-00-861-002. On the upper ECAM DU, the warning APU GEN OVERLOAD is not shown and there is no trip.
   (2) De-energize the aircraft electrical circuits from the APU AMM 24-41-00-862-002.
[Rev.8 from Aug 2018] 2026.04.04 04:26:26 UTC
"WTRUIB" 2025