Loss of the CVR Bus of the SDAC 1

TASK 31-54-00-810-963-A
Loss of the CVR Bus of the SDAC 1

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AWM 237105
AMM 31-50-00-710-001	Ground Scanning of the Central Warning System
AMM 31-55-34-000-001	Removal of the SDAC
AMM 31-55-34-400-001	Installation of the SDAC

3. Fault Confirmation
Subtask 31-54-00-865-150-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	COM/CVR/SPLY	2RK	E14
49VU	COM/CVR/CTL	4RK	E13

Subtask 31-54-00-710-357-A

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

4. Fault Isolation
Subtask 31-54-00-810-213-A

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

(1) If the fault continues:

do a check and repair the wiring from the SDAC 1 (1WV1) pins AE/08E, 08F to the first terminal block, AWM 237105.

Subtask 31-54-00-710-358-A

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:30:34 UTC