Loss of the Bus of the Cabin Pressure Controller 2 by the SDAC1

TASK 31-54-00-810-934-A
Loss of the Bus of the Cabin Pressure Controller 2 by the SDAC1

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 31-54-00-865-131-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
122VU	AIR COND/CAB PRESS/CTL/2	2HL	Y22

Subtask 31-54-00-710-301-A

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

4. Fault Isolation
Subtask 31-54-00-810-183-B

A. If the test gives the maintenance message:
SDAC1: NO DATA FROM CPC2

(1) If the fault continues:

do a check and repair the wiring from SDAC 1 (1WV1) pins AE/13C, 13D to the first terminal block ASM 315403.

Subtask 31-54-00-710-302-A

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

[Rev.8 from Aug 2018] 2026.04.04 04:30:33 UTC