Loss of the CIDS-SDF2 or SDCU Channel 2 Bus Detected by the FWC 1

TASK 31-53-00-810-891-A
Loss of the CIDS-SDF2 or SDCU Channel 2 Bus Detected by the FWC 1

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 31-53-00-710-216-A

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

4. Fault Isolation
Subtask 31-53-00-810-140-A

A. If the test gives the maintenance message:

FWC1 : NO DATA FROM SDCU2

or

FWC1 : NO DATA FROM CIDS-SDF2

(1) If the fault continues:

do a check and repair the wiring from FWC 1 (1WW1) pins AE/8E, 8F to the first terminal block ASM 315203.

Subtask 31-53-00-710-217-A

B. Do the test given in Para. 3.

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