W DOC AIRBUS | TSM A320F

Loss of the AC BUS 1

TASK 24-50-00-810-812-A
Loss of the AC BUS 1

1. Possible Causes
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
AMM 24-21-51-000-040
Removal of the Integrated Drive Generator - IDG 1(2)
AMM 24-21-51-400-040
Installation of the Integrated Drive Generator - IDG 1(2)
AWM 242201
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
AWM 245105
AWM 245107
AWM 245109
AMM 31-60-00-860-001
EIS Start Procedure
3. Fault Confirmation
Subtask 24-50-00-860-070-A
A. Job Set-up
   (1) Aircraft Maintenance Configuration
     (a) Energize the aircraft electrical circuits
AMM 24-41-00-861-002.
     (b) Do the EIS start procedure (Upper ECAM DU and lower ECAM DU only)
AMM 31-60-00-860-001.
Subtask 24-50-00-710-072-A
B. Test
Do this test:
ACTION
RESULT
1.On the ECAM control panel:
  • push the ELEC key to get the ELEC page.
On the upper ECAM display unit:
  • these warnings come into view:
    ELEC AC BUS 1 FAULT
    ELEC AC ESS BUS FAULT
    ELEC DC ESS BUS FAULT
    On the overhead panel, on panel 35VU:
  • the FAULT legend of the AC ESS FEED pushbutton switch is on.
4. Fault Isolation
Subtask 24-50-00-810-061-A ** ON A/C NOT FOR ALL
A. If the test confirms the fault:
   (1) If the feeders are not correct:
  • repair them.
   (2) If the feeders are correct:
  • do a check of the feeders between the GLC1 (9XU1) and the IDG1 (4000XU) for a short to ground or a short circuit AWM 242201.
     (a) If the feeders are not correct:
  • repair them.
     (b) If the feeders are correct:
Subtask 24-50-00-810-061-D ** ON A/C NOT FOR ALL
A. If the test confirms the fault:
   (1) If the feeders are not correct:
  • repair them.
   (2) If the feeders are correct:
  • do a check of the feeders between the GLC1 (9XU1) and the IDG1 (4000XU) for a short to ground or a short circuit AWM 242201.
     (a) If the feeders are not correct:
  • repair them.
     (b) If the feeders are correct:
Subtask 24-50-00-710-073-A
B. Do this test to make sure that the system operates correctly:
ACTION
RESULT
On the ECAM control panel:
  • push the ELEC key to get the ELEC page.
On the lower ECAM display unit:
  • the normal configuration comes into view.
5. Close-up
Subtask 24-50-00-860-071-A
A. Put the aircraft back to its initial configuration.
   (1) On the ECAM control panel, set the UPPER DISPLAY and LOWER DISPLAY potentiometers to OFF.
   (2) De-energize the aircraft electrical circuits
AMM 24-41-00-862-002.
[Rev.8 from Aug 2018] 2026.04.04 04:26:56 UTC
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