Loss of the YELLOW RSVR QTY Input of the SDAC 1

TASK 31-54-00-810-835-A
Loss of the YELLOW RSVR QTY Input 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 315101
ASM 315402
AMM 31-55-34-000-001	Removal of the SDAC
AMM 31-55-34-400-001	Installation of the SDAC

3. Fault Confirmation
Subtask 31-54-00-865-074-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
121VU	HYDRAULIC/HYD/QTY/IND	1831GQ	P35

Subtask 31-54-00-710-106-A

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

4. Fault Isolation
Subtask 31-54-00-810-084-A ** ON A/C NOT FOR ALL

A. If the test gives the maintenance message SDAC1 : Y HYD QTY IND 3000GQ:

(1) If the fault continues:

do a check and repair the wiring from the SDAC 1 (1WV1) pins AE/6H, 6J, 6K to the first terminal block, ASM 315402.

(2) If the fault continues:

do a check for continuity of the wiring from the SDAC 1 (1WV1) pin AC/4 to the C/B 9WV, ASM 315101.

(a) If there is no continuity:

Subtask 31-54-00-810-084-B ** ON A/C NOT FOR ALL

A. If the test gives the maintenance message SDAC1 : Y HYD QTY IND 3000GQ:

(1) If the fault continues:

do a check and repair the wiring from the SDAC 1 (1WV1) pins AE/6H, 6J, 6K to the first terminal block, ASM 315402.

(2) If the fault continues:

do a check for continuity of the wiring from the SDAC 1 (1WV1) pin AC/4 to the C/B 1831GQ, ASM 315101.

(a) If there is no continuity:

Subtask 31-54-00-710-107-A

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

[Rev.8 from Aug 2018] 2026.04.04 04:30:26 UTC