Operational Check of Wing Tank Pump Pressure Sense Line Check Valves

TASK 28-21-00-710-002-A
Operational Check of Wing Tank Pump Pressure Sense Line Check Valves

WARNING: PUT THE SAFETY DEVICES AND THE WARNING NOTICES IN POSITION BEFORE YOU START A TASK ON OR NEAR:

THE FLIGHT CONTROLS
THE FLIGHT CONTROL SURFACES
THE LANDING GEAR AND THE RELATED DOORS
COMPONENTS THAT MOVE.

MOVEMENT OF COMPONENTS CAN KILL OR CAUSE INJURY TO PERSONS AND/OR CAN CAUSE DAMAGE TO THE EQUIPMENT.

ZONE: 210

1. Reason for the Job
Refer to the MPD TASK: 282100-01
OPERATIONAL CHECK OF WING TANK PUMP PRESSURE SENSE LINE CHECK VALVES
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	SAFETY BARRIER(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
210	CKPT,FWD COMPT BHD TO FLT COMPT BULKHEAD

C. Referenced Information

REFERENCE	DESIGNATION
TASK 12-11-28-650-003-A	Pressure Refuel with Automatic Control
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 31-60-00-860-001-A	EIS Start Procedure
TASK 31-60-00-860-002-A	EIS Stop Procedure

3. Job Set-up
Subtask 28-21-00-941-071-A

A. Safety Precautions
(1) Put the SAFETY BARRIER(S) in position.

Subtask 28-21-00-860-053-A

B. Aircraft Maintenance Configuration
(1) Energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-861-002).
(2) Do the EIS start procedure (ECAM only) (Ref. AMM TASK 31-60-00-860-001), then:

on the ECAM control panel (CP), push (in) the FUEL push button switch
make sure that the FUEL page shows on the ECAM lower display unit (DU).

(3) Make sure that each wing tank contains not less than 500 kg (1103 lb) of fuel. Refuel if necessary (Ref. AMM TASK 12-11-28-650-003).

4. Procedure

WARNING: WHEN YOU OPERATE THE FUEL PUMPS DURING A MAINTENANCE PROCEDURE, A MAINTENANCE PERSON MUST BE IN THE COCKPIT. THIS PERSON MUST STOP THE PUMPS WHEN THE LOW PRESSURE FAULT LIGHT(S) (ON PANEL 40VU) COME ON, TO PREVENT OPERATION OF THE PUMPS(S) WITHOUT FUEL ('DRY RUNNING'). OPERATION OF THE PUMPS WITHOUT FUEL CAN CAUSE A FIRE.

Subtask 28-21-00-710-054-A

A. Annunciator Light Test

ACTION	RESULT
1.On the panel 25VU:	On the panel 40VU:
put the ANN LT test switch to the TEST position	make sure that all the fuel P/BSW lights come on
put the ANN LT switch to the BRT or DIM position.	make sure that all the fuel P/BSW lights return to their initial condition.

Subtask 28-21-00-710-053-A ** ON A/C NOT FOR ALL

B. Operational Check of the Wing Tank Pump Pressure Sense Line Check Valves (33QM, 34QM, 35QM and 36QM)

NOTE: This test is to make sure that the check valves have not failed in the open position. These check valves are installed in the primary supply of the wing-tank fuel-scavenge jet-pumps.
In normal operation all wing tank fuel-pumps run during flight.
If one of these check valves fail in the open position, a fuel-pump failure will not be detected by the related fuel-pump pressure-switch.
This is because fuel (under pressure from the active pump) has an unrestricted path to the pressure-switch of the failed pump.
The unrestricted path is through the failed open check valve.
This only applies to fuel-pumps in the same wing.
Fuel-pump failures in the opposite wing will stay detectable.

This check is for the left tank (L TK) pumps. For the right tank (R TK) pumps, use the indications in parentheses.

ACTION	RESULT
1.Push (in) the L TK PUMP 1 (R TK PUMP 1) P/BSW.	In the L TK PUMP 1 (R TK PUMP 1) P/BSW: the OFF light goes off the FAULT light comes on momentarily and then remains off. NOTE: In this step fuel pump 1 is used to pressurize the check valve 34QM(36QM) in the reverse direction to the normal fuel flow.
2.Push (in) the L TK PUMP 2 (R TK PUMP 2) P/BSW.	In the L TK PUMP 2 (R TK PUMP 2) P/BSW: the OFF light goes off the FAULT light comes on momentarily and then remains off. NOTE: If in this step the FAULT light fails to come on momentarily, it shows that the CHECK VALVE-FUEL PUMP No 2, L(R) WING TK INR(OUTR) 34QM(36QM) has failed open.
3.Release (out) the L TK PUMP 1 and PUMP 2 (R TK PUMP 1 and PUMP 2) P/BSWs.	In the L TK PUMP 1 and PUMP 2 (R TK PUMP 1 and PUMP 2) P/BSWs: the OFF lights come on.
4.After 10 seconds, push (in) the L TK PUMP 2 (R TK PUMP 2) P/BSW.	In the L TK PUMP 2 (R TK PUMP2) P/BSW: the OFF light goes out the FAULT light comes on momentarily and then remains off. NOTE: In this step fuel pump 2 is used to pressurize the check valve 33QM(35QM) in the reverse direction to the normal fuel flow.
5.Push (in) the L TK PUMP 1 (R TK PUMP 1) P/BSW.	In the L TK PUMP 1 (R TK PUMP 1) P/BSW: the OFF light goes out the FAULT light comes on momentarily and then remains off. NOTE: If in this step the FAULT light fails to come on momentarily, it shows that the CHECK VALVE-FUEL PUMP No 1, L(R) WING TK OUTR(INR) 33QM(35QM) has failed open.
6.Release (out) the L TK PUMP 1 and PUMP 2 (R TK PUMP 1 and PUMP 2) P/BSWs.	In the L TK PUMP 1 and PUMP 2 (R TK PUMP 1 and PUMP 2) P/BSWs: the OFF lights come on.

Subtask 28-21-00-710-053-B ** ON A/C NOT FOR ALL

B. Operational Check of the Wing Tank Pump Pressure Sense Line Check Valves (222QM, 223QM, 224QM and 225QM)

NOTE: This test is to make sure that the check valves have not failed in the open position. These check valves are installed in the ambient fuel supply lines to the Integrated Drive Generator (IDG) cooling-system.
In normal operation all wing-tank fuel-pumps run during flight.
If one of these check valves fail in the open position, a fuel-pump failure will not be detected by the related fuel-pump pressure-switch.
This is because fuel (under pressure from the active pump) has an unrestricted path to the pressure-switch of the failed pump.
The unrestricted path is through the failed open check valve.
This only applies to fuel-pumps in the same wing.
Fuel-pump failures in the opposite wing will stay detectable.

This check is for the left tank (L TK) pumps. For the right tank (R TK) pumps, use the indications in parentheses.

ACTION	RESULT
1.Push (in) the L TK PUMP 1 (R TK PUMP 1) P/BSW.	In the L TK PUMP 1 (R TK PUMP 1) P/BSW: the OFF light goes off the FAULT light comes on momentarily and then remains off. NOTE: In this step fuel pump 1 is used to pressurize the check valve 222QM(225QM) in the reverse direction to the normal fuel flow.
2.Push (in) the L TK PUMP 2 (R TK PUMP 2) P/BSW.	In the L TK PUMP 2 (R TK PUMP 2) P/BSW: the OFF light goes off the FAULT light comes on momentarily and then remains off. NOTE: If in this step the FAULT light fails to come on momentarily, it shows that the CHECK VALVE 222QM(225QM) has failed open.
3.Release (out) the L TK PUMP 1 and PUMP 2 (R TK PUMP 1 and PUMP 2) P/BSWs.	In the L TK PUMP 1 and PUMP 2 (R TK PUMP 1 and PUMP 2) P/BSWs: the OFF lights come on.
4.After 10 seconds, push (in) the L TK PUMP 2 (R TK PUMP 2) P/BSW.	In the L TK PUMP 2 (R TK PUMP2) P/BSW: the OFF light goes out the FAULT light comes on momentarily and then remains off. NOTE: In this step fuel pump 2 is used to pressurize the check valve 224QM(223QM) in the reverse direction to the normal fuel flow.
5.Push (in) the L TK PUMP 1 (R TK PUMP 1) P/BSW.	In the L TK PUMP 1 (R TK PUMP 1) P/BSW: the OFF light goes out the FAULT light comes on momentarily and then remains off. NOTE: If in this step the FAULT light fails to come on momentarily, it shows that the CHECK VALVE 224QM(223QM) has failed open.
6.Release (out) the L TK PUMP 1 and PUMP 2 (R TK PUMP 1 and PUMP 2) P/BSWs.	In the L TK PUMP 1 and PUMP 2 (R TK PUMP 1 and PUMP 2) P/BSWs: the OFF lights come on.

5. Close-up
Subtask 28-21-00-860-054-A

A. Aircraft Configuration
(1) Do the EIS stop procedure (Ref. AMM TASK 31-60-00-860-002).
(2) De-energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-862-002).

Subtask 28-21-00-942-076-A

B. Removal of Equipment
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Remove the safety barriers.
(3) Remove the ground support and maintenance equipment, the special and standard tools and all other items.

[Rev.10 from 2021] 2026.04.02 07:02:19 UTC