W DOC AIRBUS | TSM A320F

Impossibility to Connect the External Power on the Aircraft

TASK 24-41-00-810-826-A
Impossibility to Connect the External Power on the Aircraft

1. Possible Causes
  • GAPCU [24XG]
  • wiring
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
ASM 244101
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 24-41-00-860-056-A ** ON A/C NOT FOR ALL
A. Job Set-up
   (1) Energize the aircraft electrical circuits from the external power AMM 24-41-00-861-002.
Subtask 24-41-00-700-050-A ** ON A/C NOT FOR ALL
B. Test
   (1) If on the POWER CENTER-AC/DC EMERGENCY panel 106VU, the AVAIL legend of the ELEC/EXT PWR pushbutton switch (10XG) is on and the EXT PWR/AVAIL caution light (9XG) is on:
  • do the trouble shooting given in the Para. 4.A.
   (2) If on the POWER CENTER-AC/DC EMERGENCY panel 106VU, the AVAIL legend of the ELEC/EXT PWR pushbutton switch (10XG) is off and the EXT PWR/AVAIL caution light (9XG) is off:
  • do the trouble shooting given in the Para. 4.C.
4. Fault Isolation
Subtask 24-41-00-810-069-A ** ON A/C NOT FOR ALL
A. If the test confirms the fault:
Subtask 24-41-00-810-070-A ** ON A/C NOT FOR ALL
B. If the test confirms the fault:
  • do a check of the PTC TRIP LED on the front face of the GAPCU.
   (1) If the PTC TRIP LED is off:
  • stop the trouble shooting.
   (2) If the PTC TRIP LED is on:
  • de-energize the aircraft electrical circuits from the external power AMM 24-41-00-862-002.
  • do a check of the wiring of the power ready signal for a short to ground or a short circuit between pin C/5 of the GAPCU and pin 1 of the ELEC/EXT PWR/COCKPIT/AVAIL/LT circuit breaker (12XG) ASM 244101.
     (a) If the wiring is not correct:
  • repair or replace as necessary.
     (b) If the wiring is correct:
Subtask 24-41-00-860-055-A ** ON A/C NOT FOR ALL
C. Do this procedure to make sure that the system operates correctly.
   (1) Energize the aircraft electrical circuits from the external power AMM 24-41-00-861-002.
   (2) De-energize the aircraft electrical circuits from the external power AMM 24-41-00-862-002.
[Rev.8 from Aug 2018] 2026.04.04 04:26:54 UTC
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