W DOC AIRBUS | TSM A320F

Failure of IDG 1 Low-Oil Pressure Switch or its Wiring

TASK 24-21-00-810-830-A
Failure of IDG 1 Low-Oil Pressure Switch or its Wiring

1. Possible Causes
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
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 24-21-00-740-050-A ** ON A/C NOT FOR ALL
A. Test
   (1) Do the BITE test of the GAPCU AMM 24-41-00-740-002.
NOTE: The CFDS message IDG1 (E1-4000XU) LOP SW/ GCU1 (1XU1) can come into view if the electrical connector C is disconnected from the IDG and the 28VDC backup power supplies the related GCU. Before you do the trouble shooting procedure for this CFDS message, make sure that the electrical connector C is not disconnected.
This CFDS message can also come into view during engine motoring or "dry cranking", then no trouble shooting is necessary and you can ignore the message.
In other conditions, do the trouble shooting procedure that follows:
     (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
CAUTION: BEFORE YOU START THE CHECK OF IDG WIRING THAT INCLUDES CONNECTORS, EXAMINE EACH CONNECTOR TO MAKE SURE THAT THERE IS NO CONTAMINATION IN IT. IF YOU FIND CONTAMINATION, CLEAN THE CONNECTOR AND CONNECT IT AGAIN. IF THE FAILURE CONTINUES, DO THE TROUBLE SHOOTING PROCEDURE AS GIVEN BELOW.
Subtask 24-21-00-810-087-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 24-21-00-810-075-B ** ON A/C NOT FOR ALL
B. If the BITE test gives the message TEST PASSED:
  • do a check of the low-oil pressure switch for an open circuit between the pins C/A and C/B (normally closed) of the IDG 1 ASM 242101.
   (1) If there is no continuity:
   (2) If there is continuity:
  • do a check of the low-oil pressure wiring ASM 242101 for an open circuit between:
    . pin C/A of the IDG 1 and pin A/4A of the GCU 1
    . pin C/B of the IDG 1 and ground.
     (a) If the wiring is not correct:
  • repair or replace as necessary.
     (b) If the wiring is correct:
Subtask 24-21-00-810-075-H ** ON A/C NOT FOR ALL
B. If the BITE test gives the message TEST PASSED:
  • Do a check of the low-oil pressure switch for an open circuit between the pins A/12 and A/3 (normally closed) of the IDG 1 ASM 242101.
   (1) If there is no continuity:
   (2) If there is continuity:
  • Do a check of the wiring for an open circuit ASM 242101 between:
    . Pin A/12 of the IDG 1 and pin A/4A of the GCU 1
    . Pin A/13 of the IDG 1 and ground.
     (a) If the wiring is not correct:
  • Repair or replace as necessary.
     (b) If the wiring is correct:
Subtask 24-21-00-740-051-A ** ON A/C NOT FOR ALL
C. When you replace a component or repair the wiring:
  • do the subsequent flight before you do the check of the Class 3 Faults of the GAPCU from the CFDS to make sure that the system operates correctly.
    If the test continues to give the fault message, continue the trouble shooting procedure.
[Rev.8 from Aug 2018] 2026.04.04 04:26:32 UTC
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