Leak Test of the Main Fuel-Pump-System Pipelines

TASK 28-21-00-790-001-A
Leak Test of the Main Fuel-Pump-System Pipelines

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: 211

1. Reason for the Job
To leak test the pipes installed or replaced in the fuel-pump system pipelines.
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
211	COCKPIT

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 28-21-00-941-070-A

A. Safety Precautions
(1) As necessary, use the applicable SAFETY BARRIERS, specified by the operator's instructions and your local regulations.

Subtask 28-21-00-860-076-A

B. Aircraft Maintenance Configuration

WARNING: MAKE SURE THAT ALL THE CIRCUITS IN MAINTENANCE ARE ISOLATED BEFORE YOU SUPPLY ELECTRICAL POWER TO THE AIRCRAFT. UNWANTED ELECTRICAL POWER CAN BE DANGEROUS.

WARNING: OBEY THE FUEL SAFETY PROCEDURES.

(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 icon switch
make sure that the FUEL page shows on the ECAM lower Display Unit (DU).

(3) Make sure that the opposite wing tank contains sufficient fuel for the test. If necessary refuel (Ref. AMM TASK 12-11-28-650-003).
(4) On the panel 40VU:

push (in) the X-FEED P/BSW.

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.

NOTE: The wing-tank fuel-pump suction valves have a controlled fuel leak rate when in the closed position. The fuel flow (controlled leak) is to prevent the formation of ice in the mouth of the suction valve. The fuel flow is only from the center tank to the wing tank. The maximum permitted flow is 210 kg (463 lb/Hour).

Subtask 28-21-00-790-050-B

A. Leak Test of the Main Fuel-Pump-System Pipelines (Left Wing, Fuselage and Center Tank)

ACTION	RESULT
1.On fuel control-panel 40VU: Push (in) the R TK PUMPS 1 and 2 pushbutton switches.	On fuel control-panel 40VU: The R TK PUMPS 1 and 2 pushbutton switches OFF lights go off The R TK PUMPS 1 and 2 pushbutton switches FAULT lights come on momentarily and then go off.
2.On the lower ECAM System Display (SD) FUEL page: Wait for two minutes to let the fuel tank levels become stable.	On the lower ECAM SD FUEL page: The fuel tank levels are stable. NOTE: There may be small gauge fluctuations that should be taken into account.
3.On the lower ECAM SD FUEL page: Monitor the fuel level in all tanks for 30 minutes, to make sure that the pipework does not leak.	On the lower ECAM SD FUEL page: The fuel quantity in the tanks do not increase.
4.If the fuel quantity in the tanks increases, stop the test. Find the indication of the fuel leakage and repair the leak. Do the test again.
5.On fuel control-panel 40VU: Release (out) the R TK PUMPS 1 and 2 pushbutton switches.	On fuel control-panel 40VU: The R TK PUMPS 1 and 2 pushbutton switches OFF lights come on.

Subtask 28-21-00-790-051-B

B. Leak Test of the Main Fuel-Pump-System Pipelines (Right Wing, Fuselage and Center Tank)

ACTION	RESULT
1.On fuel control-panel 40VU: Push (in) the L TK PUMPS 1 and 2 pushbutton switches.	On fuel control-panel 40VU: The L TK PUMPS 1 and 2 pushbutton switches OFF lights go off The L TK PUMPS 1 and 2 pushbutton switches FAULT lights come on momentarily and then go off.
2.On the lower ECAM System Display (SD) FUEL page: Wait for two minutes to let the fuel tank levels become stable.	On the lower ECAM SD FUEL page: The fuel tank levels are stable. NOTE: There may be small gauge fluctuations that should be taken into account.
3.On the lower ECAM SD FUEL page: Monitor the fuel level in all tanks for 30 minutes, to make sure that the pipework does not leak.	On the lower ECAM SD FUEL page: The fuel quantity in the tanks do not increase.
4.If the fuel quantity in the tanks increases, stop the test. Find the indication of the fuel leakage and repair the leak. Do the test again.
5.On fuel control-panel 40VU: Release (out) the L TK PUMPS 1 and 2 pushbutton switches.	On fuel control-panel 40VU: The L TK PUMPS 1 and 2 pushbutton switches OFF lights come on.

5. Close-up
Subtask 28-21-00-860-077-A

A. Aircraft Maintenance Configuration

CAUTION: BEFORE YOU CLOSE THE CROSSFEED VALVE, MAKE SURE THAT THE FUEL PUMP(S) IS(ARE) OFF. THIS WILL PREVENT DAMAGE TO THE CROSSFEED VALVE.

(1) In the cockpit, on fuel panel 40VU, release the X-FEED pushbutton switch.
(2) Do the EIS stop procedure
(Ref. AMM TASK 31-60-00-860-002).
(3) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).

Subtask 28-21-00-942-075-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 07:01:20 UTC