Failure of the IDG 2 Oil-Out Temperature Bulb or its Wiring

TASK 24-21-00-810-804-A
Failure of the IDG 2 Oil-Out Temperature Bulb or its Wiring

1. Possible Causes

wiring
IDG [4000XU]
GCU-2 [1XU2]

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)
AMM 24-41-00-740-004	Operational Check of the GPCU via the CFDS

3. Fault Confirmation
Subtask 24-21-00-710-056-B ** ON A/C NOT FOR ALL

A. Test
Do the operational check of the GPCU with the CFDS AMM 24-41-00-740-004.

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 24-21-00-810-053-D ** ON A/C NOT FOR ALL

A. If the test gives the maintenance message CHECK GCU2 PIN A8A, A9B ; IDG2 B7, B8 WIRING:

do a check of the wiring for open circuit or short to ground between respectively the IDG 2 pins B/7, B/8 and the GCU 2 pins A/8A, A/9B 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 of the IDG 2.

NOTE: The normal value is 99.1 Ohms plus or minus 5 Ohms at 25°C.

(a) If the resistance value is out of the specified limits:

replace the IDG [4000XU] AMM 24-21-51-000-040 and AMM 24-21-51-400-040.

(b) If the resistance value is in the specified limits:

replace the GCU-2 [1XU2] AMM 24-22-34-000-001 and AMM 24-22-34-400-001.

Subtask 24-21-00-710-057-B ** ON A/C NOT FOR ALL

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:26:29 UTC