Failure of the IDG2 Oil Level Sensor or its Wiring

TASK 24-22-00-810-832-A
Failure of the IDG2 Oil Level Sensor or its Wiring

1. Possible Causes

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

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
ASM 242101
AMM 24-21-51-000-803	Removal 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 24-22-00-869-052-A ** ON A/C NOT FOR ALL

A. Test

Not Applicable.

Subtask 24-22-00-869-052-B ** ON A/C NOT FOR ALL

A. Test
(1) On the overhead panel, on the ELEC control panel 35VU, push, release and push again the GEN2 pushbutton switch (3XU2).
(2) After ten minutes, do the BITE test of the EPGS AMM 24-41-00-740-002.

4. Fault Isolation
Subtask 24-22-00-810-092-A ** ON A/C NOT FOR ALL

A. If the CFDS POST FLIGHT REPORT or the EPGS GROUND REPORT gives the maintenance message IDG2(E2-4000XU)OIL LEVEL SENSOR/GCU2(1XU2):

Replace the GCU-2 [1XU2] AMM 24-22-34-000-001 and AMM 24-22-34-400-001 and send the faulty GCU2 to Hamilton Sundstrand for investigation.

Subtask 24-22-00-810-092-C ** ON A/C NOT FOR ALL

A. If the BITE test gives the maintenance message IDG2 (E2-4000XU) OIL LEVEL SENSOR/GCU2 (1XU2):

NOTE: The CMS message IDG2 (E2-4000XU) OIL LEVEL SENSOR/GCU2 (1XU2) can come into view if the electrical connector B is disconnected from the IDG2 and the 28VDC backup power supplies the GCU2. Before you do the trouble shooting procedure for this maintenance maintenance, make sure that the electrical connector B is not disconnected.

Do a check of the resistance of the Remote Oil Lever Sensor (ROLS) of the of the IDG2 between the pins B/3 and B/4 (100 ohms plus or minus 50 ohms at 25 deg.C (77.00 deg.F)) ASM 242101.

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

Replace IDG-ENG 2 [4000XU2] AMM 24-21-51-000-803 and AMM 24-21-51-400-803.

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

Do a check of the wiring for an open circuit or a short to ground between the pins A/13B, A/13A of the GCU2 and the pins B/3, B/4 of the IDG2 ASM 242101.

(a) If the wiring is not correct:

Repair it.

(b) If the wiring is correct:

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

1 If the fault continues:

Replace IDG-ENG 2 [4000XU2] AMM 24-21-51-000-803 and AMM 24-21-51-400-803.

5. Close-up
Subtask 24-22-00-740-085-A ** ON A/C NOT FOR ALL

A. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:26:38 UTC