W DOC AIRBUS | TSM A320F

Loss of the GEN 1 (Failure of the IDG 1 Feeder or GCU 1 POR Wiring)

TASK 24-20-00-810-817-A
Loss of the GEN 1 (Failure of the IDG 1 Feeder or GCU 1 POR Wiring)

1. Possible Causes
  • wiring
  • IDG [4000XU]
  • GCU-1 [1XU1]
  • sockets of the 400VC1
  • Generator 1 contactor-module 30XN1
  • Terminal block 1999VT
  • Terminal block 400VT1
  • Terminal blocks T1, T2, T3 and N of IDG 1
  • Receptacle 400VC1
  • [4000XU1]
2. Job Set-up Information
 A. Fixtures, Tools, Test and Support Equipment
REFERENCE
QTY
DESIGNATION
No specific
1
DYNAMOMETER 15 DAN (33 LBF) - PULL
 B. Referenced Information
REFERENCE
DESIGNATION
ESPM 2048230
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 242201
AWM 242201
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 24-41-00-740-004
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 24-20-00-700-062-A ** ON A/C NOT FOR ALL
A. Test
Not applicable.
NOTE: As the GEN 1 was set to OFF because of a true fault, the fault confirmation is not necessary.
4. Fault Isolation
Subtask 24-20-00-810-062-B ** ON A/C NOT FOR ALL
A. If the fault symptom is identified by the CFDS message CHECK GLC 1 PIN D, E, F GCU 1 PIN B1A, B2A, B3A and upper ECAM DU warning GEN 1 FAULT:
  • do a check of the voltage of each phase.
   (1) If the voltage on each phase is correct:
  • do a check of the wiring between respectively the GCU 1 pins B/1A, B/2B, B/3A and the GLC 1 pins D, E and F ASM 242201.
     (a) If there is no continuity:
  • repair the above wiring.
     (b) If there is continuity:
  • do a check of the wiring between respectively the IDG 1 pins A/T1, B/T2, C/T3 and the GLC 1 terminals D, E and F.
       1 If there is no continuity:
  • repair the above wiring.
       2 If there is continuity:
  • do an impedance check between the IDG 1 terminals and the neutral.
NOTE: . impedance between each terminal and neutral must be 0.0105 Ohm plus or minus 0.001 Ohm at 25 deg.C.
. the maximum difference allowed between the values read is 0.03 Ohm.
         a If the impedance is out of tolerance:
         b If the impedance is correct:
   (2) If the voltage on one phase is not correct:
  • do a pin retention check ESPM 2048230 of the sockets of the 400VC1 AWM 242201. Use a DYNAMOMETER 15 DAN (33 LBF) - PULL, the CANNON value is 1.2 daN (2.7 lbf) minimum and the SOURIAU value is 2.8 daN (6.3 lbf) minimum, in relation to pin/socket type used.
Subtask 24-20-00-810-062-D ** ON A/C NOT FOR ALL
A. If the fault symptom is identified by the CFDS message CHECK GLC 1 PIN D, E, F GCU 1 PIN B1A, B2A, B3A and 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 voltage of each phase.
     (a) If the voltage on each phase is correct:
  • Do a check of the wiring between respectively the GCU 1 pins B/1A, B/2B, B/3A and the generator 1 contactor module (30XN1) pins 1, 2, 3 ASM 242201.
       1 If there is no continuity:
  • Repair the wiring.
       2 If there is continuity:
  • Do a check of the wiring between respectively the IDG 1 pins A/T1, B/T2, C/T3 and the generator 1 contactor module (30XN1) pins 1, 2, 3.
         a If there is no continuity:
  • Repair the wiring.
         b If there is continuity:
  • Do an impedance check between the IDG 1 terminals and the neutral.
NOTE: - impedance between each terminal and neutral must be 0.0105 Ohm plus or minus 0.001 Ohm at 25 deg.C.
- the maximum difference allowed between the values read is 0.03 Ohm.
* If the impedance is out of tolerance:
*- Replace [4000XU1] AMM 24-21-51-000-040 and AMM 24-21-51-400-040.
* If the impedance is correct:
*- Replace GCU-1 [1XU1] AMM 24-22-34-000-001 and AMM 24-22-34-400-001.
     (b) If the voltage on one phase is not correct:
  • Do a pin retention check ESPM 2048230 of the sockets of the 400VC1 AWM 242201. Use a DYNAMOMETER 15 DAN (33 LBF) - PULL, the CANNON value is 1.2 daN (2.7 lbf) minimum and the SOURIAU value is 2.8 daN (6.3 lbf) minimum, in relation to pin/socket type used.
Subtask 24-20-00-860-074-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 24-20-00-710-062-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 24-20-00-860-075-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) 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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