Loss of the YELLOW RSVR QTY Input of the SDAC 1 and SDAC 2

TASK 31-54-00-810-957-A
Loss of the YELLOW RSVR QTY Input of the SDAC 1 and SDAC 2

1. Possible Causes

quantity indicator of the Yellow hydraulic reservoir
wiring from the quantity indicator pins A/A, B, C to the terminal block (7502VT)

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 29-13-41-000-003	Removal of the Quantity Indicator of the Yellow Hydraulic Reservoir
AMM 29-13-41-400-003	Installation of the Quantity Indicator of the Yellow Hydraulic Reservoir
ASM 293101
AMM 31-50-00-710-001	Ground Scanning of the Central Warning System

3. Fault Confirmation
Subtask 31-54-00-865-144-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 31-54-00-710-345-A

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

4. Fault Isolation
Subtask 31-54-00-810-206-A

A. If the test gives the maintenance messages
SDAC1: Y HYD QTY IND 3000GQ and SDAC2: Y HYD QTY IND 3000GQ:

replace the quantity indicator of the Yellow hydraulic reservoir , AMM 29-13-41-000-003 and AMM 29-13-41-400-003.

(1) If the fault continues:

do a check and repair the wiring from the quantity indicator pins A/A, B, C to the terminal block (7502VT), ASM 293101.

Subtask 31-54-00-710-346-A

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

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