Loss of the ATC1 Bus of the SDAC 1

TASK 31-54-00-810-969-A
Loss of the ATC1 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 31-54-00-865-156-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	COM NAV/ATC/1	5SH1	G11

Subtask 31-54-00-710-369-A

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

4. Fault Isolation
Subtask 31-54-00-810-219-A

A. If the test gives the maintenance message
SDAC1:NO DATA FROM ATC1:

(1) If the fault continues:

do a check and repair the wiring from the SDAC 1 (1WV1) pins AB/07H, 07J to the first terminal block, ASM 315403.

Subtask 31-54-00-710-370-A

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:30:35 UTC