High-Delta Temperature Condition of the IDG 1 Oil Sensors

TASK 24-00-00-810-812-A
High-Delta Temperature Condition of the IDG 1 Oil Sensors

1. Possible Causes

IDG [4000XU]
wiring
GCU-1 [1XU1]
IDG-ENG 1 [4000XU1]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 12-13-24-612-041	IDG Servicing - Filling of the IDG with Oil or Addition of Oil after a level Check
AMM 12-13-24-612-803	IDG Servicing - Filling of the IDG with Oil or Addition of Oil after a Level Check
AMM 24-21-00-210-044	Inspection of the Filter Element(s)
AMM 24-21-00-210-046	Check IDG Oil Level and Differential Pressure Indicator (DPI)
AMM 24-21-00-210-805	Check of the Oil Level and Oil-Filter Differential-Pressure Indicator (DPI)
AMM 24-21-00-210-807	Inspection of the IDG Oil Charge and Scavenge Filter Elements
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
AMM 24-21-00-920-040	Drain IDG Oil System, Discard Filter Element(s) and Replenish
AMM 24-21-00-920-802	Drain, Remove and Discard the Scavenge and Charge Filter Elements and Replenish IDG Oil System
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)

3. Fault Confirmation
Subtask 24-00-00-869-052-A ** ON A/C NOT FOR ALL

A. Test
(1) Not applicable, you cannot confirm this fault on the 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 24-00-00-810-063-D ** ON A/C NOT FOR ALL

A. If the fault symptom is identified by the CFDS message IDG1 (E1-4000XU) OIL DELTA TEMP/ GCU1 (1XU1):

do a check of the Differential Pressure Indicator (DPI) of the IDG 1 AMM 24-21-00-210-046.

(1) If the DPI is extended:

replace the engine 1 IDG [4000XU] AMM 24-21-51-000-040 and AMM 24-21-51-400-040.

(2) If the DPI is not extended:

do an inspection of the IDG 1 charge and scavenge filters AMM 24-21-00-210-044.

(a) If there is contamination of the IDG 1 charge and scavenge filters:

replace the engine 1 IDG [4000XU] AMM 24-21-51-000-040 and AMM 24-21-51-400-040.

(b) If there is no contamination of the IDG 1 charge and scavenge filters:

replace the IDG 1 charge and scavenge filters AMM 24-21-00-920-040
add oil AMM 12-13-24-612-041
do the operational test of the IDG 1 disconnect and reconnect function (with the engine in operation) AMM 24-21-00-720-041.

(3) If the fault continues:

do a check of the resistance of the oil inlet and outlet temperature-sensors of the IDG 1 ASM 242101 between:
. pin B/7 and pin B/8 (100 ohms plus or minus 10 ohms at the ambient temperature of the IDG case)
. pin B/8 and pin B/9 (100 ohms plus or minus 10 ohms at the ambient temperature of the IDG case).

(a) If the resistance values are out of the specified limits:

replace the engine 1 IDG [4000XU] AMM 24-21-51-000-040 and AMM 24-21-51-400-040.

(b) If the resistance values are in the specified limits:

do a check of the wiring of the oil inlet and outlet temperature-sensors ASM 242101 for an open circuit, a short to ground or a short to shield between:
. pin B/7 of the IDG 1 and pin A/9C of the GCU 1
. pin B/8 of the IDG 1 and pin A/9D of the GCU 1
. pin B/9 of the IDG 1 and pin A/10C of the GCU 1
. pins A/9C and A/10D of the GCU 1 (do a check for a short to shield)
. pins A/9D and A/10D of the GCU 1 (do a check for a short to shield)
. pins A/10C and A/10D of the GCU 1 (do a check for a short to shield).

1 If the wiring is not correct:

repair or replace as necessary.

2 If the wiring is correct:

replace the GCU-1 [1XU1] AMM 24-22-34-000-001 and AMM 24-22-34-400-001.

3 If the fault continues:

replace the engine 1 IDG [4000XU] AMM 24-21-51-000-040 and AMM 24-21-51-400-040.

Subtask 24-00-00-810-063-G ** ON A/C NOT FOR ALL

A. If the fault symptom is identified by the CFDS message IDG1 (E1-4000XU) OIL TEMP/ GCU1 (1XU1):

Do a check of the Differential Pressure Indicator (DPI) of the IDG 1 AMM 24-21-00-210-805.