Loss of the CIDS-SDF1 or SDCU Channel 1 Bus Detected by the FWC 2

TASK 31-53-00-810-892-A
Loss of the CIDS-SDF1 or SDCU Channel 1 Bus Detected by the FWC 2

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
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 31-53-00-710-218-A

A. Do the ground scanning of the central warning system (FWC) AMM 31-50-00-710-001.

4. Fault Isolation
Subtask 31-53-00-810-141-A

A. If the test gives the maintenance message:

FWC2 : NO DATA FROM SDCU1

or

FWC2 : NO DATA FROM CIDS-SDF1

(1) If the fault continues:

do a check and repair the wiring from FWC 2 (1WW2) pins AB/8E, 8F to the first terminal block ASM 315203.

Subtask 31-53-00-710-219-A

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:30:18 UTC