Operational Check of Forward ACT Isolation Valve

TASK 28-28-00-710-012-A
Operational Check of Forward ACT Isolation Valve

WARNING: OBEY THE FUEL SAFETY PROCEDURES.

1. Reason for the Job
Refer to the MPD TASK: 282800-64
OPERATIONAL CHECK OF FORWARD ACT ISOLATION VALVE
This MPD task is applicable only when the ACT is installed.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 1M(3 FT)
No specific	1	WARNING NOTICE(S)

B. Referenced Information

REFERENCE	DESIGNATION
TASK 24-41-00-861-002-A	Energize the Aircraft Electrical Circuits from the External Power
TASK 24-41-00-861-002-A-01	Energize the Aircraft Electrical Circuits from the APU
TASK 24-41-00-861-002-A-02	Energize the Aircraft Electrical Circuits from Engine 1(2)
TASK 24-41-00-862-002-A	De-energize the Aircraft Electrical Circuits Supplied from the External Power
TASK 24-41-00-862-002-A-01	De-energize the Aircraft Electrical Circuits Supplied from the APU
TASK 24-41-00-862-002-A-02	De-energize the Aircraft Electrical Circuits Supplied from the Engine 1(2)
TASK 28-00-00-910-001-A	Fuel Safety Procedures
TASK 32-12-00-010-001-A	Open the Main Gear Doors for Access
TASK 32-12-00-410-001-A	Close the Main Gear Doors after Access

3. Job Set-up
Subtask 28-28-00-860-108-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Obey the fuel safety procedures (Ref. AMM TASK 28-00-00-910-001).
(2) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).
(3) Put the WARNING NOTICE(S) in position on:

Refuel/Defuel panel 800VU
Fueling panels 28VU and 40VU
to tell persons not to operate the refuel/defuel system.

Subtask 28-28-00-010-117-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Open the main gear doors for access (Ref. AMM TASK 32-12-00-010-001).
(2) Put an ACCESS PLATFORM 1M(3 FT) in position in the left main gear bay.

Subtask 28-28-00-865-083-A ** ON A/C NOT FOR ALL

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	AFMC SPLY	3QN	B08
121VU	FUEL/ACT XFR VLV/MOT2	66QH	J18
121VU	FUEL/ACT XFR VLV/MOT1	65QH	J17
121VU	FUEL/AFMC/SPLY	4QN	K19
121VU	FUEL/ACT/FUEL PUMP/SPLY	25QH	Q29
121VU	FUEL/RFL/ON BAT	5QN	R30

4. Procedure
Subtask 28-28-00-710-065-B ** ON A/C NOT FOR ALL

A. Operational Check of Forward ACT Isolation Valve

ACTION	RESULT
1.In the main gear bay, on isolation valve actuator (92QH): Disconnect electrical connector 92QH A from the isolation valve actuator and put a blanking cap on the open line end. NOTE: Airbus recommends you to do the test on motor No.2 of the isolation valve actuator.
2.Energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-861-002).	In the main gear bay, on the isolation valve actuator: The indicator of the isolation valve actuator is in the open position.
3.In the cockpit, on ACT control panel 28VU, make sure that: The FWD ACT OVRD P/BSW is in the OFF position The FWD ACT FAULT indication is in the OFF position.
4.In the cockpit, set the Auxiliary Fuel Management Computer (AFMC): On panel 121VU, open circuit breaker 70QH "FUEL/FUEL FWD/ISOL VLV/MOT2 CTL" On panel 49VU, open circuit breaker 60QH "FUEL FWD ISOL VLV MOT1 CTL".
5.After a minimum of 10 seconds: On panel 121VU, close circuit breaker 70QH "FUEL/FUEL FWD/ISOL VLV/MOT2 CTL" On panel 49VU, close circuit breaker 60QH "FUEL FWD ISOL VLV MOT1 CTL".	In the main gear bay, on the isolation valve actuator: Wait for a minimum of 3 minutes and monitor the indicator of the isolation valve actuator at the same time The indicator of the isolation valve actuator moves from the open position to the closed position and then goes back to the open position.
6.De-energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-862-002). 7.In the main gear bay, on the isolation valve actuator: Connect electrical connector 92QH A to the isolation valve actuator Disconnect electrical connector 92QH B from the isolation valve actuator and put a blanking cap on the open line end. NOTE: Airbus recommends you to do the test on motor No.1 of the isolation valve actuator. 8.Energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-861-002).
9.Do steps 3., 4. and 5. again.	In the main gear bay, on the isolation valve actuator: Monitor the indicator of the isolation valve actuator during 3 minutes The indicator of the isolation valve actuator moves from the open position to the closed position and then goes back to the open position.
10.De-energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-862-002). 11.In the main gear bay, on the isolation valve actuator: Connect electrical connector 92QH B to the isolation valve actuator.

5. Close-up
Subtask 28-28-00-410-079-A ** ON A/C NOT FOR ALL

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Remove the access platform(s).
(3) Close the main gear doors after access (Ref. AMM TASK 32-12-00-410-001).

Subtask 28-28-00-860-109-A ** ON A/C NOT FOR ALL

B. Put the aircraft back to its initial configuration.
(1) Remove the WARNING NOTICE(S).
(2) Remove the ground support and maintenance equipment, the special and standard tools and all other items.

[Rev.10 from 2021] 2026.04.02 06:17:51 UTC