The IDG1 Cannot be Disconnected Intentionnally

TASK 24-21-00-810-809-A
The IDG1 Cannot be Disconnected Intentionnally

1. Possible Causes

P/BSW-ELEC/IDG 1 [5XT]
RELAY-IDG 1 DISC CTL [3XT]
RELAY-FUNCTION (7XT)
wiring

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 24-21-00-720-050-B ** ON A/C NOT FOR ALL

A. Test
Do the functional test of the IDG Disconnect System - Engine in Operation AMM 24-21-00-720-041. If the test at step 1 (Para. 4.A.(1)) is not OK, do the trouble shooting as follows.

Subtask 24-21-00-720-050-E ** ON A/C NOT FOR ALL

A. Test
Do the operational test of the IDG disconnect and reconnect (reset) function with the engine in operation AMM 24-21-00-710-803. If the test in step 1 (Para. 4.A.(1)) is not OK, do the troubleshooting procedure that follows.

4. Fault Isolation
Subtask 24-21-00-810-058-A

A. If the test confirms the fault:

replace the P/BSW-ELEC/IDG 1 [5XT] .

(1) If the fault continues:

replace the RELAY-IDG 1 DISC CTL [3XT] and RELAY-FUNCTION (7XT).

(a) If the fault continues:

do a check and repair the wiring between respectively:
. the pin B3 of the pushbutton switch (5XT) and the first branch point
. the pin B1 of the pushbutton switch (5XT) and the pin B3 of the relay (7XT)
. the pin B2 of the relay (7XT) and the pin X1 of the relay (3XT)
. the pin X2 of the relay (3XT) and the ground
. the pin A13 of the IDG (4000XU) and the ground ASM 242101.

Subtask 24-21-00-720-051-A

B. Do this test to make sure that the system operates correctly.
Do the test given in Para. 3. and make sure that the FAULT legend of the ELEC/IDG1 pushbutton switch goes off when the pushbutton switch is pushed.

[Rev.8 from Aug 2018] 2026.04.04 04:26:30 UTC