Loss of all the Parameters from the FWC 1 and the FWC 2 to the DMC 1

TASK 31-53-00-810-961-A
Loss of all the Parameters from the FWC 1 and the FWC 2 to the DMC 1

1. Possible Causes

FWC-1 [1WW1]
FWC-2 [1WW2]
DMC-1 [1WT1]
wiring for the MESSAGE 1 and DATA 1 buses from the FWC 1 to the DMC 1 and from the FWC 2 to the DMC1

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
ASM 315205
AMM 31-53-34-000-001	Removal of the Flight Warning Computer (FWC)
AMM 31-53-34-400-001	Installation of the Flight Warning Computer (FWC)
AMM 31-60-00-740-004	EIS System Test
AMM 31-63-34-000-001	Removal of the DMC
AMM 31-63-34-400-001	Installation of the DMC

3. Fault Confirmation
Subtask 31-53-00-740-086-A

A. Test
Do the EIS System Test AMM 31-60-00-740-004.

4. Fault Isolation
Subtask 31-53-00-810-215-A ** ON A/C NOT FOR ALL

A. If the test gives the maintenance messages NO FWC1 MSG, NO FWC2 MSG, NO FWC 1 DATA and NO FWC 2 DATA:

(1) If the fault continues:

(2) If the fault continues:

remove the FWC-1 [1WW1]
remove the DMC-1 [1WT1]
remove the FWC-2 [1WW2]
do a check and repair the wiring for the MESSAGE 1 and DATA 1 buses from the FWC 1 to the DMC 1 and from the FWC 2 to the DMC1 ASM 315205.
Install the FWC-2 [1WW2]
Install the DMC-1 [1WT1]
Install the FWC-1 [1WW1]

Subtask 31-53-00-810-215-B ** ON A/C NOT FOR ALL

A. If the test gives the maintenance messages FWC 1(1WW1) and FWC 2(1WW2):

(1) If the fault continues:

(2) If the fault continues:

remove the FWC-1 [1WW1]
remove the DMC-1 [1WT1]
remove the FWC-2 [1WW2]
do a check and repair the wiring for the MESSAGE 1 and DATA 1 buses from the FWC 1 to the DMC 1 and from the FWC 2 to the DMC1 ASM 315205.
Install the FWC-2 [1WW2]
Install the DMC-1 [1WT1]
Install the FWC-1 [1WW1]

Subtask 31-53-00-740-087-A

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

[Rev.8 from Aug 2018] 2026.04.04 04:30:22 UTC