Loss of the Amber DISC Indication for the IDG 1

TASK 24-21-00-810-834-A
Loss of the Amber DISC Indication for the IDG 1

1. Possible Causes

wiring
RELAY-IDG 1 DISC CTL [3XT]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
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
ASM 242101

3. Fault Confirmation
Subtask 24-21-00-710-087-A ** ON A/C NOT FOR ALL

A. Test
(1) Do the operational test of the IDG disconnect and reconnect (reset) function - Engine in operation AMM 24-21-00-720-041
(2) If the IDG does not disconnect or the DISC indication does not come into view on the ELEC page on the lower ECAM display unit:

do the trouble shooting given in para 4.A.

Subtask 24-21-00-710-087-D ** ON A/C NOT FOR ALL

A. Test
(1) Do the operational test of the IDG disconnect and reconnect (reset) function with the engine in operation AMM 24-21-00-710-803.
(2) If the IDG does not disconnect or the DISC indication does not come into view on the ELEC page on the lower ECAM DU:

Do the trouble shooting given in Para 4.A.

4. Fault Isolation
Subtask 24-21-00-810-093-A ** ON A/C NOT FOR ALL

A. If the test confirms the fault:
(1) Do a check and repair the wiring ASM 242101:

between the pin A/3B of the GCU 1 (1XU1) and the pin 2 of the circuit breaker (1XT)
the pin A/10D of the GCU 1 (1XU1) and the pin A/4A of the EGIU 1 (22XU1).

(2) If the fault continues:

replace the RELAY-IDG 1 DISC CTL [3XT] .

Subtask 24-21-00-810-093-B ** ON A/C NOT FOR ALL

A. If the test confirms the fault:
(1) Do a check and repair the wiring between the pin A/2J of the GCU 1 (1XU1) and the pin 2 of the circuit breaker (1XT) ASM 242101.
(2) If the fault continues:

replace the RELAY-IDG 1 DISC CTL [3XT] .

Subtask 24-21-00-710-088-A ** ON A/C NOT FOR ALL

B. Test
(1) Do the operational test of the IDG disconnect and reconnect (reset) function - Engine in operation AMM 24-21-00-720-041.

Subtask 24-21-00-710-088-D ** ON A/C NOT FOR ALL

B. Test
(1) Do the operational test of the IDG disconnect and reconnect (reset) function with the engine in operation AMM 24-21-00-710-803.

[Rev.8 from Aug 2018] 2026.04.04 04:26:32 UTC