Failure of the A629 BUS from the Upper ECAM DU to the DMC1

TASK 31-63-81-810-964-A
Failure of the A629 BUS from the Upper ECAM DU to the DMC1

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 31-60-00-720-002	Operational Test of the DMC/DU data bus
ASM 316104
AMM 31-63-22-000-001	Removal of the Display Unit
AMM 31-63-22-400-001	Installation of the Display Unit
AMM 31-63-34-000-001	Removal of the DMC
AMM 31-63-34-400-001	Installation of the DMC

3. Fault Confirmation
Subtask 31-63-81-720-083-A ** ON A/C NOT FOR ALL

A. Test
Do the operational test of the DMC/DU Data Bus AMM 31-60-00-720-002.

4. Fault Isolation
Subtask 31-63-81-810-249-A ** ON A/C NOT FOR ALL

A. If the test gives:
(1) The maintenance message DU EWD(4WT1)/DMC1(1WT1):

(a) If the wiring is correct:

(b) If the fault continues:

Subtask 31-63-81-720-084-A ** ON A/C NOT FOR ALL

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:31:09 UTC