Loss of the BMC 2 Bus of the SDAC 1

TASK 31-54-00-810-853-A
Loss of the BMC 2 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 31-54-00-865-092-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	AIR BLEED/ENG 2/MONG	3HA2	D12
** ON A/C NOT FOR ALL
122VU	AIR BLEED/ENG 2/CTL	3HA2	Z23
122VU	AIR BLEED/ENG 2/MONG	2HA2	Z22
** ON A/C NOT FOR ALL
122VU	AIR BLEED/ENG 2/CTL	2HA2	Z22

Subtask 31-54-00-710-142-A

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

4. Fault Isolation
Subtask 31-54-00-810-102-A

A. If the test gives the maintenance message SDAC1 : NO DATA FROM BMC2:

(1) If the fault continues:

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

Subtask 31-54-00-710-143-A

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:30:27 UTC