W DOC AIRBUS | TSM A320F

Failure of the External Power Plug or Interlock Wiring

TASK 24-41-00-810-827-A
Failure of the External Power Plug or Interlock Wiring

1. Possible Causes
  • wiring
  • 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
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 24-41-00-860-066-A ** ON A/C NOT FOR ALL
A. Test
   (1) Energize the aircraft electrical circuits from the external power AMM 24-41-00-861-002.
4. Fault Isolation
Subtask 24-41-00-810-090-A ** ON A/C NOT FOR ALL
A. If the external power does not energize the electrical circuits:
  • do a check of the external power plug for correct installation.
   (1) If the plug is not installed correctly:
  • stop the external power source
  • connect the external power plug to the receptacle (20XG)
  • energize the aircraft electrical circuits from the external power AMM 24-41-00-861-002.
     (a) If, on the EXT PWR panel 108VU, the EXT PWR/AVAIL caution light (9XG) and the EXT PWR/NOT IN USE indicator light (8XG) are on:
  • stop the trouble shooting.
     (b) If, on the EXT PWR panel 108VU, the EXT PWR/AVAIL caution light (9XG) and the EXT PWR/NOT IN USE indicator light (8XG) are off:
  • do a check of the wiring of the external power interlock-control for an open circuit or a short circuit between the pin E and the cord plug of the external power source.
       1 If the wiring is not correct:
  • repair or replace as necessary.
       2 If the wiring is correct:
  • do a check of the wiring of the interlock control ASM 244101 for an open circuit, a short circuit or a short to ground between pin E of the external power receptacle (20XG) and pin B/11E of the GAPCU.
         a If the wiring is not correct:
  • repair or replace as necessary.
         b If the wiring is correct:
Subtask 24-41-00-860-067-A ** ON A/C NOT FOR ALL
B. Test
   (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 04:26:55 UTC
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