W DOC AIRBUS | TSM A320F

Loss of the Generator 1 (Pins D, E, F, R, P, N of BTC1 shorted to ground)

TASK 24-20-00-810-806-A
Loss of the Generator 1 (Pins D, E, F, R, P, N of BTC1 shorted to ground)

1. Possible Causes
  • feeder
  • IDG1 feeders
  • IDG [4000XU]
  • wiring
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)
ASM 242202
AMM 24-41-00-740-004
Operational Check of the GPCU 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 71-00-00-710-003
Engine Automatic Start
AMM 71-00-00-710-028
Engine Shutdown
3. Fault Confirmation
Subtask 24-20-00-700-102-A ** ON A/C NOT FOR ALL
A. Test
   (1) Read the Class 1 Faults of the GCU or GPCU from the CFDS.
NOTE: As the GEN1 was set to OFF because of a true failure, the test confirmation is not necessary.
4. Fault Isolation
Subtask 24-20-00-810-091-A ** ON A/C NOT FOR ALL
A. If the fault symptom is identified by the maintenance message CHECK BTC1 PIN D, E, F, R, P, N SHORT TO GROUND and by the warning GEN1 FAULT on the upper ECAM display unit:
  • do a check of the feeder for short to ground between respectively:
    . the pins A/G, A/H, A/J of the GLC1 and the main bus
    . the pins A/M, A/L, A/K of the GLC1 and the pins A/D, A/E, A/F of the BTC1
    . the pins A/R, A/P, A/N of the BTC1 and the pins A/N, A/P, A/R of the APU GLC ASM 242202
   (1) If the wiring is not correct:
  • repair it.
   (2) If the wiring is correct:
  • do a check of the IDG1 feeders for intermittent short to ground between respectively the pins A/T1, B/T2, C/T3 of the IDG1 and the pins A/D, A/E, A/F of the GLC1.
   (3) If the wiring is not correct:
  • repair it.
   (4) If the wiring is correct:
   (5) If the fault continues:
  • do a check and repair the wiring between respectively the pins A1, A6, A7, A8 of the IDG1 and the pins B/13D, B/13A, B/13B, B/13C of the GCU1.
Subtask 24-20-00-810-091-B ** ON A/C NOT FOR ALL
A. If the fault symptom is identified by the maintenance message CHECK BTC1 PIN D, E, F, R, P, N SHORT TO GROUND and by the warning GEN1 FAULT on the upper ECAM display unit:
  • do a check of the feeder for short to ground between respectively:
    . the pins 4, 5, 6 of the generator 1 contactor module (30XN1) and the main bus
    . the pins 10, 11, 12 of the generator 1 contactor module (30XN1) and the pins 10, 11, 12 of the APU/EXT power contactor module (29XN) ASM 242202.
   (1) If the wiring is not correct:
  • repair it.
   (2) If the wiring is correct:
  • do a check of the IDG1 feeders for intermittent short to ground between respectively the pins A/T1, B/T2, C/T3 of the IDG1 and the pins 1, 2, 3 of the generator 1 contactor module (30XN1).
   (3) If the wiring is not correct:
  • repair it.
   (4) If the wiring is correct:
   (5) If the fault continues:
  • do a check and repair the wiring between respectively the pins A1, A6, A7, A8 of the IDG1 and the pins B/13D, B/13A, B/13B, B/13C of the GCU1.
Subtask 24-20-00-710-078-A ** ON A/C NOT FOR ALL
B. 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 panel 35VU:
  • push, release and push again the GEN1 pushbutton switch (3XU1).
   (3) Do the operational check of the GPCU with the CFDS AMM 24-41-00-740-004.
   (4) Start the engine 1 AMM 71-00-00-710-003.
   (5) Do this test:
ACTION
RESULT
On the ECAM control panel:
  • push the ELEC key to get the ELEC page.
On the lower ECAM display unit:
  • the correct electrical parameters of GEN1 are shown and AC1 busbar is supplied by GEN1.
5. Close-up
Subtask 24-20-00-860-106-A ** 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) On the ECAM control panel, set the UPPER DISPLAY and LOWER DISPLAY potentiometers to OFF.
   (3) De-energize the aircraft electrical circuits
AMM 24-41-00-862-002.
[Rev.8 from Aug 2018] 2026.04.04 04:26:10 UTC
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