Loss of the EVMU Bus of the SDAC 1

TASK 31-54-00-810-883-A
Loss of the EVMU Bus 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 315403
AMM 31-55-34-000-001	Removal of the SDAC
AMM 31-55-34-400-001	Installation of the SDAC

3. Fault Confirmation
Subtask 31-54-00-865-111-A

A. Make sure that this(these) circuit breaker(s) is(are) closed:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
121VU	ENGINE/ENG1 AND 2/EVMU	1EV	R44

Subtask 31-54-00-710-202-A

B. Test
Do the ground scanning of the central warning systems AMM 31-50-00-710-001.

4. Fault Isolation
Subtask 31-54-00-810-132-A

A. If the test gives the maintenance message SDAC 1 : NO DATA FROM EVMU:

(1) If the fault continues:

do a check and repair the wiring from the SDAC 1 (1WV1) pins AE/12A, 12B to the first terminal block , ASM 315403.

Subtask 31-54-00-710-203-A

B. Do the test given in Para. 3.B.

[Rev.8 from Aug 2018] 2026.04.04 04:30:29 UTC