Loss of the ARINC 429 Bus 1 Output of the SDAC 1

TASK 31-54-00-810-808-A
Loss of the ARINC 429 Bus 1 Output of the SDAC 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 315404
AMM 31-55-34-000-001	Removal of the SDAC
AMM 31-55-34-400-001	Installation of the SDAC

3. Fault Confirmation
Subtask 31-54-00-710-064-A

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

4. Fault Isolation
Subtask 31-54-00-810-063-A

A. If the test gives the maintenance message:
FWC1 : NO DATA FROM SDAC1

(1) If the fault continues:

do a check and repair the wiring from the SDAC 1 (1WV1) pins AB/9G, 9H to the first terminal block , ASM 315404.

Subtask 31-54-00-710-065-A

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:30:23 UTC