Failure of the Generator Control Unit 1

TASK 24-22-00-810-821-A
Failure of the Generator Control Unit 1

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
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 24-22-00-740-065-A ** ON A/C NOT FOR ALL

A. Test
(1) Read the Class 3 Faults of the GAPCU from the CFDS AMM 24-41-00-740-002.

4. Fault Isolation
Subtask 24-22-00-810-079-A ** ON A/C NOT FOR ALL

A. If the Class 3 Faults gives the maintenance message GCU1 (1XU1):

Subtask 24-22-00-740-066-A ** ON A/C NOT FOR ALL

B. When you replace a component or repair the wiring:

do the subsequent flight before you do the check of the Class 3 Faults of the GAPCU from the CFDS to make sure that the system operates correctly.
If the test continues to give the fault message, continue the trouble shooting procedure.

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