Failure of the A629 BUS from the ND CAPT DU to the DMC1

TASK 31-63-81-810-961-A
Failure of the A629 BUS from the ND CAPT 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 31-63-81-720-077-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 31-63-81-810-246-A ** ON A/C NOT FOR ALL

A. If the test gives:
(1) The maintenance message DU ND CAPT(3WT1)/DMC1(1WT1):

(a) If the wiring is correct:

(b) If the fault continues:

Subtask 31-63-81-720-078-A ** ON A/C NOT FOR ALL

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:40:11 UTC