W DOC AIRBUS | TSM A320F

Failure of the Generator 1 Channel

TASK 24-20-00-810-862-A
Failure of the Generator 1 Channel

1. Possible Causes
2. Job Set-up Information
 A. Fixtures, Tools, Test and Support Equipment
REFERENCE
QTY
DESIGNATION
No specific
AR
SAFETY CLIP - CIRCUIT BREAKER
 B. Referenced Information
REFERENCE
DESIGNATION
ASM 242201
ASM 242202
AMM 24-22-55-000-001
Removal of the Contactors
AMM 24-22-55-400-002
Installation of the Contactors
AMM 24-41-00-740-002
Operational Check of the GAPCU via the CFDS
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 24-20-00-860-176-A ** ON A/C NOT FOR ALL
A. Job Set-Up
   (1) Make sure that the aircraft electrical circuits are de-energized.
   (2) Do not start the engines.
Subtask 24-20-00-865-056-A ** ON A/C NOT FOR ALL
B. Open, safety and tag this(these) circuit breaker(s):
PANELDESIGNATIONFINLOCATION
** ON A/C NOT FOR ALL
123VUBUS 1/131XP-A/SPLY5XN1AB12
123VUBUS 1/103XP/SPLY3XN1AB11
123VUTR1/SPLY2PU1AB10
123VUAC ESS/BUS ON/BUS 11XCAC12
123VUBUS 1/101XP/SPLY1XN1AD11
123VUAVNCS VENT/BLOWER/FAN1HQAD10
123VUBUS 1/110XP/SPLY7XN1AF11
123VUANTI ICE/L/WHSLD1DG1AF10
Subtask 24-20-00-869-050-A ** ON A/C NOT FOR ALL
C. Test
Not applicable.
NOTE: As the GEN 1 was set to OFF because of a true failure, the fault confirmation is not necessary.
4. Fault Isolation
Subtask 24-20-00-810-107-D ** ON A/C NOT FOR ALL
A. If the fault symptom is identified by the CFDS message DELTA CURRENT GEN1 CHANNEL or OVERCURRENT GEN1 CHANNEL and the upper ECAM-DU warnings GEN 1 FAULT and AC BUS 1 FAULT:
  • Do a check of the feeders ASM 242201 for a short circuit or a short to ground between:
    . Pin L1 of the Current Transformer Assembly (CTA) (51XU1) and pin 1 of the generator 1 contactor module (30XN1)
    . Pin L2 of the CTA and pin 2 of the generator 1 contactor module
    . Pin L3 of the CTA and pin 3 of the generator 1 contactor module.
   (1) If the feeders are not correct:
  • Repair or replace the feeders as necessary.
   (2) If the feeders are correct:
  • Do a check of the power distribution feeders ASM 242202 for a short circuit or a short to ground between:
    . Pins 4, 5 and 6 of the generator 1 contactor module (30XN1) and the primary circuit breakers of bus 1XP
    . Pin 4 and pin 7 of the generator 1 contactor module
    . Pin 5 and pin 8 of the generator 1 contactor module
    . Pin 6 and pin 9 of the generator 1 contactor module
    . Pins 7, 8 and 9 of the generator 1 contactor module and the lightning strike protection module (19XU1).
     (a) If the feeders are not correct:
  • Repair or replace the feeders as necessary.
     (b) If the feeders are correct:
       1 If the fault continues:
Subtask 24-20-00-865-057-A ** ON A/C NOT FOR ALL
B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
PANELDESIGNATIONFINLOCATION
** ON A/C NOT FOR ALL
123VUBUS 1/131XP-A/SPLY5XN1AB12
123VUBUS 1/103XP/SPLY3XN1AB11
123VUTR1/SPLY2PU1AB10
123VUAC ESS/BUS ON/BUS 11XCAC12
123VUBUS 1/101XP/SPLY1XN1AD11
123VUAVNCS VENT/BLOWER/FAN1HQAD10
123VUBUS 1/110XP/SPLY7XN1AF11
123VUANTI ICE/L/WHSLD1DG1AF10
Subtask 24-20-00-710-139-C ** ON A/C NOT FOR ALL
C. Do this operational test to make sure that the system operates correctly.
   (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.
   (2) In the cockpit, on the ELEC panel 35VU:
  • Push, release and push again the GEN 1 pushbutton switch (3XU1).
   (3) Do the BITE test of the GAPCU AMM 24-41-00-740-002.
   (4) Start engine 1 AMM 71-00-00-860-823.
   (5) Do this test:
ACTION
RESULT
On the ECAM control panel:
  • Push the ELEC key to get the ELEC page.
On the lower ECAM DU:
  • The correct electrical parameters of GEN 1 are shown and GEN 1 supplies the AC1 busbar.
Subtask 24-20-00-710-139-G ** ON A/C NOT FOR ALL
C. Do this operational test to make sure that the system operates correctly.
   (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.
   (2) On the ELEC panel 35VU:
  • push, release and push again the GEN 1 pushbutton switch (3XU1).
   (3) Do the operational test of the GAPCU AMM 24-41-00-740-002.
   (4) Start the engine 1 AMM 71-00-00-710-003.
   (5) Do this test:
ACTION
RESULT
On the ECAM control panel:
  • get the ELEC page.
On the lower ECAM DU:
  • the correct electrical parameters of the GEN 1 are shown and the AC1 busbar is supplied by the GEN 1.
5. Close-up
Subtask 24-20-00-860-168-C ** ON A/C NOT FOR ALL
A. Put the aircraft back to its initial configuration.
   (1) Stop engine 1 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.
Subtask 24-20-00-860-168-G ** ON A/C NOT FOR ALL
A. Put the aircraft back to its initial configuration.
   (1) Stop the engine 1 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.
[Rev.8 from Aug 2018] 2026.04.04 04:26:15 UTC
"WTRUIB" 2025