W DOC AIRBUS | TSM A320F

Failure of the Disconnect Solenoid System of the IDG 1

TASK 24-21-00-810-820-A
Failure of the Disconnect Solenoid System of the IDG 1

1. Possible Causes
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
AMM 24-21-00-710-803
Operational Test of the IDG Disconnect and Reconnect (Reset) Function - Engine Static
AMM 24-21-00-720-041
Operational Test of the IDG Disconnect and Reconnect (Reset) Function - Engine in Operation
ASM 242101
AMM 24-21-51-000-040
Removal of the Integrated Drive Generator - IDG 1(2)
AMM 24-21-51-000-803
Removal of the Integrated Drive Generator - IDG 1(2)
AMM 24-21-51-400-040
Installation of the Integrated Drive Generator - IDG 1(2)
AMM 24-21-51-400-803
Installation of the Integrated Drive Generator - IDG 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 24-41-00-740-002
Operational Check of the GAPCU via the CFDS
3. Fault Confirmation
Subtask 24-21-00-740-058-A ** ON A/C NOT FOR ALL
A. Test
   (1) Do the BITE test of the GAPCU AMM 24-41-00-740-002.
NOTE: Do the trouble shooting for all the other CFDS messages related to the IDG 1 that come into view with the message IDG1 (E1-4000XU)/ RELAY (3XT)/GCU1 (1XU1).
     (a) If the BITE test gives the message TEST FAILED:
  • do the trouble shooting given in Para 4.A.
     (b) If the BITE test gives the message TEST PASSED:
  • do the trouble shooting given in Para 4.B.
4. Fault Isolation
Subtask 24-21-00-810-089-A ** ON A/C NOT FOR ALL
A. If the BITE test gives the message TEST FAILED:
  • push the line key adjacent to the TEST FAILED message.
   (1) If the maintenance message GCU1 (1XU1) comes into view:
Subtask 24-21-00-810-079-F ** ON A/C NOT FOR ALL
B. If the BITE test gives the message TEST PASSED:
  • do an electrical resistance test of the IDG 1 disconnect solenoid for an open circuit or a high resistance condition between pin A/12 and pin A/13 of the IDG 1 (3 ohms plus or minus 1 ohm) ASM 242101.
   (1) If the resistance values are out of the specified limits:
   (2) If the resistance values are in the specified limits:
     (a) If the test is OK:
  • stop the trouble shooting.
     (b) If the test is not OK:
  • do a check of the wiring for an open circuit or a short to ground between pin A1 of the IDG 1 disconnect control relay (3XT) and pin A/12 of the IDG 1 ASM 242101.
       1 If the wiring is not correct:
  • repair or replace as necessary.
       2 If the wiring is correct:
         a If the fault continues:
Subtask 24-21-00-810-079-J ** ON A/C NOT FOR ALL
B. If the BITE test gives the message TEST PASSED:
  • Do a check of the resistance of the IDG1 disconnect solenoid for an open circuit or a high resistance condition between pin A/3 and pin A/4 of the IDG 1 (3 ohm plus or minus 1 ohm) ASM 242101.
   (1) If the resistance value is out of the specified limits:
   (2) If the resistance value is in the specified limits:
  • Replace the RELAY-IDG 1 DISC CTL [3XT]
  • Do the operational test of the IDG1 disconnect and reconnect function (with the engine in operation) AMM 24-21-00-710-803.
     (a) If the test is OK:
  • Stop the troubleshooting procedure.
     (b) If the test is not OK:
  • Do a check of the wiring for an open circuit or a short to ground between pin AA1 of the IDG 1 disconnect control relay (3XT) and pin A4 of the IDG1 ASM 242101.
       1 If the wiring is not correct:
  • Repair or replace as necessary.
       2 If the wiring is correct:
         a If the fault continues:
Subtask 24-21-00-740-059-A ** ON A/C NOT FOR ALL
C. Do the test given in Para. 3.
[Rev.8 from Aug 2018] 2026.04.04 04:26:31 UTC
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