W DOC AIRBUS | TSM A320F

Failure of AC BUS 1 Supplied by APU GEN or EXT PWR when GEN 2 Becomes Available

TASK 24-50-00-810-820-A
Failure of AC BUS 1 Supplied by APU GEN or EXT PWR when GEN 2 Becomes Available

1. Possible Causes
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
AMM 24-22-55-000-001
Removal of the Contactors
AMM 24-22-55-400-002
Installation of the Contactors
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 31-60-00-860-001
EIS Start Procedure
AMM 31-60-00-860-002
EIS Stop Procedure
AMM 71-00-00-710-003
Engine Automatic Start
AMM 71-00-00-710-028
Engine Shutdown
AMM 71-00-00-860-814
Shutdown of the Engine
AMM 71-00-00-860-823
Start the Engine (Normal Automatic Start)
3. Fault Confirmation
Subtask 24-50-00-860-090-B ** ON A/C NOT FOR ALL
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.
     (c) Start engine 2 AMM 71-00-00-710-003.
Subtask 24-50-00-860-090-D ** ON A/C NOT FOR ALL
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.
     (c) Start engine 2 AMM 71-00-00-710-003.
Subtask 24-50-00-860-090-G ** ON A/C NOT FOR ALL
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.
     (c) Start engine 2 AMM 71-00-00-860-823.
Subtask 24-50-00-710-089-A
B. Test
ACTION
RESULT
1.On the ECAM control panel:
  • Push the ELEC key to get the ELEC page.
On the lower ECAM DU:
  • Make sure that all the busbars are energized.
Subtask 24-50-00-860-091-B ** ON A/C NOT FOR ALL
C. Put the aircraft back to its initial configuration.
   (1) Stop engine 2 AMM 71-00-00-710-028.
   (2) Do the EIS stop procedure
AMM 31-60-00-860-002.
   (3) On the ECAM control panel, set the UPPER DISPLAY and LOWER DISPLAY potentiometers to OFF.
   (4) De-energize the aircraft electrical circuits
AMM 24-41-00-862-002.
Subtask 24-50-00-860-091-D ** ON A/C NOT FOR ALL
C. Put the aircraft back to its initial configuration.
   (1) Stop engine 2 AMM 71-00-00-710-028.
   (2) Do the EIS stop procedure
AMM 31-60-00-860-002.
   (3) On the ECAM control panel, set the UPPER DISPLAY and LOWER DISPLAY potentiometers to OFF.
   (4) De-energize the aircraft electrical circuits
AMM 24-41-00-862-002.
Subtask 24-50-00-860-091-G ** ON A/C NOT FOR ALL
C. Put the aircraft back to its initial configuration.
   (1) Stop engine 2 AMM 71-00-00-860-814.
   (2) Do the EIS stop procedure
AMM 31-60-00-860-002.
   (3) On the ECAM control panel, set the UPPER DISPLAY and LOWER DISPLAY potentiometers to OFF.
   (4) De-energize the aircraft electrical circuits
AMM 24-41-00-862-002.
4. Fault Isolation
Subtask 24-50-00-810-072-A
A. If the test confirms the fault:
   (1) Replace BTC-2 [11XU2] AMM 24-22-55-000-001 and AMM 24-22-55-400-002.
Subtask 24-50-00-710-088-A
B. Do the test given in Para. 3.
[Rev.8 from Aug 2018] 2026.04.04 04:26:57 UTC
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