Loss of the FCDC 1 Bus of the FWC 1

TASK 31-53-00-810-840-A
Loss of the FCDC 1 Bus of the FWC 1

1. Possible Causes

FWC-1 [1WW1]
FCDC-1 [3CE1]
wiring

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 27-95-34-000-001	Removal of the FCDC
AMM 27-95-34-400-001	Installation of the FCDC
AMM 31-50-00-710-001	Ground Scanning of the Central Warning System
ASM 315203
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)

3. Fault Confirmation
Subtask 31-53-00-710-114-A

A. Test
Do the operational test of the central warning systems (FWC) AMM 31-50-00-710-001.

4. Fault Isolation
Subtask 31-53-00-810-089-A

A. If the test gives the maintenance message FWC1 : NO DATA FROM FCDC1:
(1) Replace the FWC-1 [1WW1] , AMM 31-53-34-000-001 and AMM 31-53-34-400-001.
(2) If the fault continues:

Replace the FCDC-1 [3CE1] , AMM 27-95-34-000-001 and AMM 27-95-34-400-001.

(3) If the fault continues:

Do a check and repair the wiring from FWC 1 (1WW1) pins AB/8G, 8H to the FCDC1 (3CE1) pins AB/5E, 5F ASM 315203.

Subtask 31-53-00-710-115-A

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:30:14 UTC