W DOC AIRBUS | TSM A320F

Difference in IDG 1 Oil-In/Oil-Out Bulb Tolerances

TASK 24-21-00-810-807-A
Difference in IDG 1 Oil-In/Oil-Out Bulb Tolerances

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 24-21-51-400-040
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)
3. Fault Confirmation
Subtask 24-21-00-710-062-A ** ON A/C NOT FOR ALL
A. Test
Not applicable.
NOTE: The BITE test permits to do a check of the GCU only. The fault confirmation related to IDG 1 BULB TOLERANCE is not possible on ground.
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 24-21-00-810-056-D ** ON A/C NOT FOR ALL
A. If the fault symptom is identified by the CFDS message IDG 1 BULB TOLERANCE:
  • do a check of the wiring :
    . for open circuit between the GCU 1 pin A/9A and the IDG 1 pin B/9
    . for short to ground between the GCU 1 pin A/8A and the IDG 1 pin B/7
    . for wire cross-connection between respectively the GCU 1 pins A/8A, A/9A, A/9B and the IDG 1 pins B/7, B/9, B/8 ASM 242101.
   (1) If the wiring is not correct:
  • repair it.
   (2) If the wiring is correct:
  • do a check of the resistance between the pins B/7 and B/8, then between the pins B/8 and B/9 of the IDG 1.
NOTE: The normal value is 99.1 Ohms plus or minus 5 Ohms at 25°C.
     (a) If the oil-out bulb resistance is less than the oil-in bulb resistance:
     (b) If the oil-out bulb resistance is not less than the oil-in bulb resistance:
[Rev.8 from Aug 2018] 2026.04.04 04:26:30 UTC
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