W DOC AIRBUS | TSM A320F

Loss of the GEN 1 (Failure of the Electrical Wiring between the GCU 1 and GLC 1)

TASK 24-20-00-810-823-A
Loss of the GEN 1 (Failure of the Electrical Wiring between the GCU 1 and GLC 1)

1. Possible Causes
  • Generator 1 contactor-module 30XN1
  • Terminal block 1999VT
  • Terminal block 400VT1
  • Terminal blocks T1, T2, T3 and N of IDG 1
  • Receptacle 400VC1
  • wiring
  • EGIU-1
  • GLC-1 [9XU1]
  • RELAY-GLC 1 AUX CTL
  • GCU-1 [1XU1]
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
TSM TASK 24-20-00-810-804-A
Loss of the GEN 1 (Failure of the Electrical Wiring between the GLC 1 and GCU 1)
ASM 242202
AMM 24-22-33-000-001
Removal of the EGIU-1(2)
AMM 24-22-33-400-002
Installation of the EGIU-1(2)
AMM 24-22-34-000-001
Removal of the GCU-1(2)
AMM 24-22-34-400-001
Installation of the GCU-1(2)
AMM 24-22-55-000-001
Removal of the Contactors
AMM 24-22-55-400-002
Installation of the Contactors
AMM 24-41-00-740-004
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 24-20-00-700-067-A ** ON A/C NOT FOR ALL
A. 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 24-20-00-810-067-A ** ON A/C NOT FOR ALL
A. If the fault symptom is identified by the CFDS message CHECK GLC 1 AND/OR CONTROL CKT and the upper ECAM DU warning GEN 1 FAULT:
   (1) Do a visual inspection and repair or replace as necessary:
  • Generator 1 contactor-module 30XN1
  • Terminal block 1999VT
  • Terminal block 400VT1
  • Terminal blocks T1, T2, T3 and N of IDG 1
  • Receptacle 400VC1 .
   (2) Do a check of the status of the GCU 1 circuit breaker.
     (a) If the circuit breaker is open:
     (b) If the circuit breaker is closed:
  • Do a check of the wiring for open circuit:
    . from the GCU1 pin B/2D to the pin A/D2 of the GLC1 AUX CTL relay, then the EGIU1 pin A/12A, then the GCU1 pin A/5B (the ELEC/GEN1 pushbutton switch must be pushed),
    . from the GCU1 pin A/12D to the EGIU1 pin A/13A,
    . from the GCU1 pin A/12C to the pin A/X1 of the GLC1 AUX CTL relay (the ELEC/GEN1 pushbutton switch must be pushed),
    . from the pin D1 of the GLC1 AUX CTL relay to the GLC1 pin B/3,
    . from the pin A/X2 of the GLC1 AUX CTL relay to the ground (Ref. ASM 24-22/02),
    . from the GLC1 pin B/5 to the ground ASM 242202.
     (c) If there is no continuity:
  • Repair the wiring.
     (d) If there is continuity:
  • do a check of the EGIU 1 wiring for open circuit from pin A/12A to pin A/13A.
       1 If there is no continuity:
       2 If there is continuity:
       3 If the fault continues:
  • Replace RELAY-GLC 1 AUX CTL .
       4 If the fault continues:
Subtask 24-20-00-860-084-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 ELEC panel 35VU:
  • push, release and push again the GEN 1 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.
Subtask 24-20-00-710-067-A ** ON A/C NOT FOR ALL
C. Do this test:
ACTION
RESULT
On the ECAM control panel:
  • get the ELEC page.
On the lower ECAM display unit:
  • the correct electrical parameters of GEN 1 are shown and AC 1 busbar is supplied by GEN 1.
5. Close-up
Subtask 24-20-00-860-085-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 04:26:12 UTC
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