Failure of the Control of the Fuel Shut-off Valve on Engine 1

TASK 76-12-00-810-810-A
Failure of the Control of the Fuel Shut-off Valve on Engine 1

1. Possible Causes

aircraft wiring
RELAY-ENG/MASTER 1 [11QG]
ACTUATOR-LP FUEL VALVE, ENG 1 [9QG]
CTL SW-ENG/MASTER 1 [3KC]
VALVE-LP FUEL, ENG 1 [12QM]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
ESPM 204521
AMM 28-24-00-710-002	Operational Test of the ENG 1(2) LP Fuel Valve
ASM 282401
AMM 28-24-41-000-001	Removal of the LP Fuel Valve
AMM 28-24-41-400-001	Installation of the LP Fuel Valve
AMM 28-24-51-000-001	Removal of the LP Fuel Valve Actuator
AMM 28-24-51-400-001	Installation of the LP Fuel Valve Actuator
AMM 71-00-00-710-003	Engine Automatic Start
ASM 761201
AWM 761201

3. Fault Confirmation
Subtask 76-12-00-710-066-A ** ON A/C NOT FOR ALL

A. Test
(1) Not applicable, the fault is evident.

4. Fault Isolation
Subtask 76-12-00-865-050-A ** ON A/C NOT FOR ALL

A. Table of the circuit breakers used in this procedure:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	FUEL/LP VALVE/MOT1/ENG1	1QG	A08
49VU	ENGINE/1/HP FUEL SOV	1KC1	A01
121VU	FUEL/LP VALVE/MOT2/ENG1	3QG	M25

Subtask 76-12-00-810-058-B ** ON A/C NOT FOR ALL

B. If the fault symptom is identified by the CFDS message MASTER LEVER, HMU:

Make sure that the LP fuel valve is open AMM 28-24-00-710-002.

(1) If the valve is not open:

Do a check of the aircraft wiring between the circuit breakers (1QG), (3QG) and the ENG 1 LP fuel valve actuator (9QG) pins AA/A, BB/A ASM 761201 and ASM 282401.

(a) If there is no continuity:

Repair the above wiring or/and replace the RELAY-ENG/MASTER 1 [11QG] .

(b) If there is continuity:

Replace the ACTUATOR-LP FUEL VALVE, ENG 1 [9QG] AMM 28-24-51-000-001 and AMM 28-24-51-400-001.

Do a check of the aircraft wiring between C/B (1KC1) pin 2 and CTL SW-ENG/MASTER 1 (3KC) pin 3G then CTL SW-ENG/MASTER 1 (3KC) pin 1G to HMU (HPSOV) connector A pin 1.

(d) If the fault continues:

Replace the CTL SW-ENG/MASTER 1 [3KC] on the panel 115VU AWM 761201 ESPM 204521.

(e) If the fault continues:

Replace the VALVE-LP FUEL, ENG 1 [12QM] AMM 28-24-41-000-001 and AMM 28-24-41-400-001.

Subtask 76-12-00-710-067-A ** ON A/C NOT FOR ALL

C. Test
(1) Start the engine 1 by the engine automatic start procedure AMM 71-00-00-710-003.
(2) Make sure that there is no ECAM and CFDS fault message shown.

[Rev.8 from Aug 2018] 2026.04.04 04:37:27 UTC