Loss of the FCU 2 Channel B Output Bus by DMC 1

TASK 31-63-81-810-934-A
Loss of the FCU 2 Channel B Output Bus by DMC 1

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 31-60-00-740-007	GROUND SCANNING Test of the DMC
ASM 316201
AMM 31-63-34-000-001	Removal of the DMC
AMM 31-63-34-400-001	Installation of the DMC

3. Fault Confirmation
Subtask 31-63-81-740-312-A ** ON A/C NOT FOR ALL

A. Test
Do the Ground Scanning Test of the DMC AMM 31-60-00-740-007.

4. Fault Isolation
Subtask 31-63-81-810-216-A ** ON A/C NOT FOR ALL

A. If the test gives the maintenance message FCU2(2CA)BUS FCU2B/DMC1(1WT1):

(1) If the fault continues:

do a check and repair the wiring from the DMC 1 (1WT1) pins AA/1G, 1H to the first terminal block ASM 316201.

5. Close-up
Subtask 31-63-81-740-313-A ** ON A/C NOT FOR ALL

A. Do the test given in Para. 3.A.

[Rev.8 from Aug 2018] 2026.04.04 04:40:07 UTC