Failure of the SDAC 1

TASK 31-54-00-810-810-A
Failure 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 315101
AMM 31-55-34-000-001	Removal of the SDAC
AMM 31-55-34-400-001	Installation of the SDAC

3. Fault Confirmation
Subtask 31-54-00-710-068-A

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

4. Fault Isolation
Subtask 31-54-00-865-142-A

A. Table of the circuit breakers used in this procedure:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	SDAC/1/SPLY	3WV	F04

Subtask 31-54-00-810-065-A

B. If the test gives the maintenance message:
SDAC1

(1) If the circuit breaker (3WV) is closed:

(a) If the fault continues:

do a check of the wiring from the SDAC 1 (1WV1) pin AC/1 to the circuit breaker (3WV), ASM 315101.

1 If there is no continuity:

2 If there is continuity:

(2) If the circuit breaker (3WV) is open:

(a) If the circuit breaker is open again:

1 If the fault continues:

do a check and repair for a short to ground the wiring between the circuit breaker (3WV) and the SDAC 1 (1WV1).

(b) If the circuit breaker stays closed and the fault continues:

Subtask 31-54-00-710-069-A

C. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:39:00 UTC