Operational Check of Air Release Valves to Ensure Adequate Fuel Flow Under Suction Feed Conditions

TASK 28-21-00-710-008-A
Operational Check of Air Release Valves to Ensure Adequate Fuel Flow Under Suction Feed Conditions

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: 282100-03
OPERATIONAL CHECK OF AIR RELEASE VALVES TO ENSURE ADEQUATE FUEL FLOW UNDER SUCTION FEED CONDITIONS

NOTE: Use one of the two procedures (A or B) to do the operational check of the air-release valves. Where possible, do procedure B (which uses the APU). If it is not possible to operate the APU, do procedure A.

2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	ACCESS PLATFORM 3M (10 FT)
No specific	AR	CAP - BLANKING
No specific	AR	CONTAINER 30 L(8 USGAL)
No specific	AR	CONTAINER 5 L (1.32 USGAL)
No specific	AR	SAFETY BARRIER(S)
No specific	AR	TIE WRAP
No specific	AR	WARNING NOTICE(S)
98D28004002000	1	TEST EQUIPMENT-APU FUEL FEED

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.14QFB1)	Wire-Locking Dia: 0.8 mm CRES Nickel Alloy -

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
210	CKPT,FWD COMPT BHD TO FLT COMPT BULKHEAD
315AL, 316AR

D. Referenced Information

REFERENCE	DESIGNATION
TASK 08-21-00-200-001-A-01	Quick Leveling with a Spirit Level in the FWD Cargo Compartment
TASK 08-21-00-200-001-A-02	Quick Leveling Procedure with the ADIRU
TASK 08-21-00-200-001-A-03	Quick Leveling with a Spirit Level in the Passenger Compartment
TASK 08-21-00-200-001-A	Quick Leveling Using the Attitude Monitor
TASK 08-21-00-200-001-A-01	Quick Leveling with a Spirit Level in the FWD Cargo Compartment
TASK 08-21-00-200-001-A-02	Quick Leveling Procedure with the ADIRU
TASK 08-21-00-200-001-A-03	Quick Leveling with a Spirit Level in the Passenger Compartment
TASK 08-22-00-200-001-A	Precise Leveling
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 28-21-41-000-001-A	Removal of the Low Pressure (LP) Air-Release-Valve
TASK 28-21-41-400-001-A	Installation of the Low Pressure (LP) Air-Release Valve
TASK 28-22-00-710-001-A	Operational Test of the APU Fuel-Pump System on Ground to Purge the Fuel Line
TASK 28-25-00-650-001-A	Pressure Defuel
TASK 28-25-00-869-001-A	Fuel Transfer
TASK 49-00-00-860-005-A	APU Start by External Power
TASK 49-00-00-860-005-A-01	APU Start by Batteries
TASK 49-00-00-860-006-A	APU Shutdown by External Power
TASK 49-00-00-860-006-A-01	APU Shutdown by Batteries
TASK 49-00-00-860-008-A	APU Start by External Power
TASK 49-00-00-860-008-A-01	APU Start by Batteries
TASK 49-00-00-860-009-A	APU Shutdown by External Power (131-9(A))
TASK 49-00-00-860-009-A-01	APU Shutdown by Batteries (131-9(A))
Location of the APU Fuel Feed Pipe
Installation of the Fuel Feed Test Kit

3. Job Set-up
Subtask 28-21-00-941-074-A

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

Subtask 28-21-00-650-059-B ** ON A/C NOT FOR ALL

B. Aircraft Maintenance Configuration
(1) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).
(2) Make sure that the applicable fuel tank contains the correct quantity. Refuel, defuel or transfer fuel as necessary (Ref. AMM TASK 12-11-28-650-003), (Ref. AMM TASK 28-25-00-650-001) or (Ref. AMM TASK 28-25-00-869-001):
(a) Make sure that the inner cell of the left wing tank contains:

A minimum of 600 kg (1322.7732 lb) and a maximum of 750 kg (1653.4665 lb) of fuel.

(b) Make sure that the inner cell of the right wing tank contains:

A minimum of 600 kg (1322.7732 lb) and a maximum of 750 kg (1653.4665 lb) of fuel.

NOTE: The fuel quantities are applicable to the center tank and the tanks for which the test is necessary. There is no specified total fuel quantity (fuel quantity of the tank for which the test is not necessary) as long as the aircraft level is to +/- 3 deg (3 deg) pitch and +/- 3 deg (3 deg) roll.

(3) Make sure that the aircraft is level to +/- 3 deg (3 deg) pitch and +/- 3 deg (3 deg) roll (Ref. AMM TASK 08-21-00-200-001) or (Ref. AMM TASK 08-22-00-200-001).
(4) On fuel panel 40VU:
(a) Make sure that all the TK PUMP pushbutton switches are released (out).

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.

(b) Make sure that the X FEED pushbutton switch is released (out).
(5) Put a WARNING NOTICE(S) in position on the flight deck to tell persons not to operate:

The main booster pumps
The X FEED valve.

(a) You must let the aircraft stay in this configuration for a minimum of one hour before you do the check.

NOTE: There are two procedures available for the operational check of the air release-valves. One procedure uses the 98D28004002000 TEST EQUIPMENT-APU FUEL FEED to do the check, the other procedure uses the APU:

Do procedure A to use the 98D28004002000 TEST EQUIPMENT-APU FUEL FEED for the check.
Do procedure B to use the APU for the check.

Subtask 28-21-00-650-059-D ** ON A/C NOT FOR ALL

A minimum of 600 kg (1322.7732 lb) and a maximum of 750 kg (1653.4665 lb) of fuel.

(b) Make sure that the inner cell of the right wing tank contains:

A minimum of 600 kg (1322.7732 lb) and a maximum of 750 kg (1653.4665 lb) of fuel.

(3) Make sure that the aircraft is level to +/- 3 deg (3 deg) pitch and +/- 3 deg (3 deg) roll (Ref. AMM TASK 08-21-00-200-001) or (Ref. AMM TASK 08-21-00-200-001) or (Ref. AMM TASK 08-21-00-200-001) or (Ref. AMM TASK 08-22-00-200-001).
(4) On fuel panel 40VU:
(a) Make sure that all the TK PUMP pushbutton switches are released (out).

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.

(b) Make sure that the X FEED pushbutton switch is released (out).
(5) Put a WARNING NOTICE(S) in position on the flight deck to tell persons not to operate:

The main booster pumps
The X FEED valve.

(a) You must let the aircraft stay in this configuration for a minimum of one hour before you do the check.

Do procedure A to use the 98D28004002000 TEST EQUIPMENT-APU FUEL FEED for the check.
Do procedure B to use the APU for the check.

Subtask 28-21-00-650-059-E ** ON A/C NOT FOR ALL

B. Aircraft Maintenance Configuration
(1) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).
(2) Make sure that the applicable fuel tank contains the correct quantity. Refuel or defuel as necessary (Ref. AMM TASK 12-11-28-650-003) or (Ref. AMM TASK 28-25-00-650-001):
(a) Make sure that the left wing fuel-tank contains:

A minimum of 600 kg (1322.7732 lb) and a maximum of 750 kg (1653.4665 lb) of fuel.

(b) Make sure that the right wing fuel-tank contains:

A minimum of 600 kg (1322.7732 lb) and a maximum of 750 kg (1653.4665 lb) of fuel.

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.

(b) Make sure that the X FEED pushbutton switch is released (out).
(5) Put a WARNING NOTICE(S) in position on the flight deck to tell persons not to operate:

The main booster pumps
The X FEED valve.

(a) You must let the aircraft stay in this configuration for a minimum of one hour before you do the check.

Do procedure A to use the 98D28004002000 TEST EQUIPMENT-APU FUEL FEED for the check.
Do procedure B to use the APU for the check.

Subtask 28-21-00-860-068-A

C. Preparation For Check (Procedure A only)

Location of the APU Fuel Feed Pipe

WARNING: LOCK THE MECHANISM OF THE ACCESS DOOR 316AR WITH THE PIP PIN WHEN YOU OPEN THE ACCESS DOOR. THIS WILL PREVENT INJURY.

(1) Put the ACCESS PLATFORM 3M (10 FT) in position below the APU access doors 315AL and 316AR.
(2) Open the APU access doors 315AL and 316AR.
(3) De-energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-862-002).
(4) Put a CONTAINER 5 L (1.32 USGAL) in position below the APU fuel feed pipe (5080 QM).
(5) To disconnect the APU fuel feed pipe (4) from the tee assembly (1), do the steps that follow:

CAUTION: YOU MUST USE TWO WRENCHES AND HOLD THE COMPONENT WHEN YOU REMOVE/INSTALL THE PIPE COUPLINGS AND/OR UNIONS. THIS PREVENTS DAMAGE TO THE COMPONENT.

(a) Remove and discard the lockwire from the fuel feed pipe (4) and the tee assembly (1).
(b) Disconnect the pipe coupling nut (6) from the tee assembly (1).
(c) Remove the bolts (2), the washers (3) and the P-clips (5) that hold the fuel feed pipe at the firewall.
(d) Install a CAP - BLANKING on the inlet connection of the tee assembly (1).
(6) Do a leak check on the 98D28004002000 TEST EQUIPMENT-APU FUEL FEED before you install it. To do this, do the steps that follow:

CAUTION: DO NOT USE TEST PRESSURES OF MORE THAN 60 psi (4.14 bar).

(a) Make sure that the parts are assembled correctly.
(b) Install a blanking cap on the adapter that connects the 98D28004002000 TEST EQUIPMENT-APU FUEL FEED to the flexible fuel-feed pipe.
(c) Put the test equipment in a minimum depth of 245.0 mm (9.6457 in.) of clean water and blow air into the open end. You must look for air bubbles that come from the joints.
(d) If there are no leaks, remove the 98D28004002000 TEST EQUIPMENT-APU FUEL FEED from the water and remove the blanking cap. Blow warm air through the 98D28004002000 TEST EQUIPMENT-APU FUEL FEED to dry it.
(e) If there are leaks, tighten the joints and do the test again.

Installation of the Fuel Feed Test Kit

(7) Install the 98D28004002000 TEST EQUIPMENT-APU FUEL FEED.
(8) Use TIE WRAP to hold the test equipment in position. There must be a slope that goes up from point A to point B.
(9) Put a CONTAINER 30 L(8 USGAL) in position to collect the fuel.

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.

(10) Energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-861-002).

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 28-21-00-710-060-A

A. Procedure A
(1) Make sure that the engine Low Pressure (LP) valves are closed.

NOTE: An amber cross-line on the ECAM Display Unit (DU) shows that the LP valves are closed.

(2) Do this check for the air release valve on the feed line of the left engine:

ACTION	RESULT
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.On fuel panel 40VU: Make sure that the X FEED pushbutton switch is released (out).	The ECAM DU shows that the X FEED valve is in the closed position (cross-line).
2.On overhead panel 25VU: Push APU MASTER SW 14KD pushbutton switch.	The APU fuel shutoff valve moves to the open position and the APU fuel pump starts.
3.Monitor the fuel flow for 5 minutes.	The fuel flow must be normal and there must be no air bubbles in the fuel. NOTE: There can be air bubbles in the fuel during the initial fuel flow, this must quickly stop.
4.If the air bubbles do not stop, or no fuel flows, replace the left air-release valve (Ref. AMM TASK 28-21-41-000-001) (Ref. AMM TASK 28-21-41-400-001). If you replace the left air-release valve do the check again.
5.On overhead panel 25VU: Push APU MASTER SW 14KD pushbutton switch again.	The APU fuel shutoff valve moves to the closed position and the APU fuel pump stops.

Subtask 28-21-00-710-061-A

B. Procedure A
(1) Do this check for the air release valve on the feed line of the right engine:

ACTION	RESULT
1.On fuel panel 40VU: Push (in) the X FEED pushbutton switch.	The ECAM Display unit (DU) shows that the X FEED valve is in the open position (in-line). The ON and OPEN legends come on.
2.On overhead panel 25VU: Push (in) APU MASTER SW 14KD pushbutton switch.	The APU LP fuel shutoff valve moves to the open position and the APU fuel pump starts.
3.Monitor the fuel flow for 5 minutes.	The fuel flow must be normal and there must be no air bubbles in the fuel. NOTE: There can be air bubbles in the fuel during the initial fuel flow but these must quickly stop.
4.If the air bubbles do not stop, or no fuel flows, replace the right air-release valve (Ref. AMM TASK 28-21-41-000-001) (Ref. AMM TASK 28-21-41-400-001). If you replace the right air-release valve do the check again.
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. 5.On fuel panel 40VU: Release (out) the X FEED pushbutton switch.	The ON and OPEN legends go off. The ECAM DU shows that the X FEED valve is in the closed position (cross-line).
6.On overhead panel 25VU: Push APU MASTER SW 14KD pushbutton switch again.	The APU LP fuel shutoff valves moves to the closed position and the APU fuel pump stops.

Subtask 28-21-00-860-067-A

C. Aircraft Configuration (Procedure A only)
(1) De-energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-862-002).
(2) Put a container in position below the APU fuel feed pipe at the connection to the 98D28004002000 TEST EQUIPMENT-APU FUEL FEED.
(3) Remove the 98D28004002000 TEST EQUIPMENT-APU FUEL FEED.
(4) Remove the blanking cap from the inlet connection of the tee assembly (1).
(5) Install the APU fuel feed pipe (4) to the inlet connection of the tee assembly (1).
(6) Connect the pipe coupling nut (6) to the inlet connection of the tee assembly (1).
(7) Safety the pipe coupling nut (6) to the tee assembly (1) with 14QFB1Wire-Locking Dia: 0.8 mm CRES Nickel Alloy -.
(8) Install the bolts (2), the washers (3) and the P-clips (5) that hold the fuel feed pipe (4) in position.
(9) Do the operational test of the APU fuel pump system (Ref. AMM TASK 28-22-00-710-001).

Subtask 28-21-00-710-064-B ** ON A/C NOT FOR ALL

D. Procedure B
(1) Do this check for the air release valve on the feed line of the left engine:

ACTION	RESULT
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.On fuel control-panel 40VU: Make sure that the X FEED pushbutton switch is released (out).	The ECAM DU shows that the X FEED valve is in the closed position (cross-line).
CAUTION: WHEN YOU DO THE TESTS, YOU MUST OPERATE THE APU WITH NO LOADS. IF YOU OPERATE THE APU WITH LOAD, THIS WILL CAUSE AN APU FAILURE. 2.Start the APU: For GTCP 36-300 APU (Ref. AMM D/O 49-00-00-86) For APS 3200 APU (Ref. AMM TASK 49-00-00-860-005) For 131-9(A) APU (Ref. AMM D/O 49-00-00-86).
3.Monitor the performance of the APU for eight minutes.	The APU must operate correctly. If the APU does not start to operate or does not continue to operate (Auto shutdown): The left air-release valve could be defective. NOTE: If there is a defect in the APU, there will be warnings related to the low fuel pressure.
4.If the air release valve does not operate correctly: A.Replace the air release valve (Ref. AMM TASK 28-21-41-000-001) and (Ref. AMM TASK 28-21-41-400-001). B.Do the check of the air release valve again.

Subtask 28-21-00-710-065-B ** ON A/C NOT FOR ALL

E. Procedure B
(1) Do this check for the air release valves on the feed line of the right engine:

ACTION	RESULT
1.On fuel control-panel 40VU: Push (in) the X FEED pushbutton switch.	The ECAM DU shows that the X FEED valve is in the open position (in-line). The ON and OPEN legends come on.
2.Monitor the performance of the APU for eight minutes.	The APU must operate correctly. If the APU does not start to operate or does not continue to operate (Auto shutdown): The right air-release valve could be defective. NOTE: If there is a defect in the APU, there will be warnings related to the low fuel pressure.
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. 3.On fuel panel 40VU: Make sure that the X FEED pushbutton switch is released (out).	The ECAM DU shows that the X FEED valve is in the closed position (cross-line).
4.If the air release valve does not operate correctly: A.Replace the air release valve (Ref. AMM TASK 28-21-41-000-001) and (Ref. AMM TASK 28-21-41-400-001). B.Do the check of the air release valve again.
5.Stop the APU: For GTCP 36-300 APU (Ref. AMM D/O 49-00-00-86) For APS 3200 APU (Ref. AMM TASK 49-00-00-860-006) For 131-9(A) APU (Ref. AMM D/O 49-00-00-86).

Subtask 28-21-00-710-064-C ** ON A/C NOT FOR ALL

F. Procedure B
(1) Do this check for the air release valve on the feed line of the left engine:

ACTION	RESULT
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.On fuel control-panel 40VU: Make sure that the X FEED pushbutton switch is released (out).	The ECAM DU shows that the X FEED valve is in the closed position (cross-line).
CAUTION: WHEN YOU DO THE TESTS, YOU MUST OPERATE THE APU WITH NO LOADS. IF YOU OPERATE THE APU WITH LOAD, THIS WILL CAUSE AN APU FAILURE. 2.Start the APU: For GTCP 36-300 APU (Ref. AMM D/O 49-00-00-86) For APS 3200 APU (Ref. AMM D/O 49-00-00-86) For 131-9(A) APU (Ref. AMM TASK 49-00-00-860-008).
3.Monitor the performance of the APU for eight minutes.	The APU must operate correctly. If the APU does not start to operate or does not continue to operate (Auto shutdown): The left air-release valve could be defective. NOTE: If there is a defect in the APU, there will be warnings related to the low fuel pressure.
4.If the air release valve does not operate correctly: A.Replace the air release valve (Ref. AMM TASK 28-21-41-000-001) and (Ref. AMM TASK 28-21-41-400-001). B.Do the check of the air release valve again.

Subtask 28-21-00-710-065-C ** ON A/C NOT FOR ALL

G. Procedure B
(1) Do this check for the air release valves on the feed line of the right engine:

ACTION	RESULT
1.On fuel control-panel 40VU: Push (in) the X FEED pushbutton switch.	The ECAM DU shows that the X FEED valve is in the open position (in-line). The ON and OPEN legends come on.
2.Monitor the performance of the APU for eight minutes.	The APU must operate correctly. If the APU does not start to operate or does not continue to operate (Auto shutdown): The right air-release valve could be defective. NOTE: If there is a defect in the APU, there will be warnings related to the low fuel pressure.
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. 3.On fuel panel 40VU: Make sure that the X FEED pushbutton switch is released (out).	The ECAM DU shows that the X FEED valve is in the closed position (cross-line).
4.If the air release valve does not operate correctly: A.Replace the air release valve (Ref. AMM TASK 28-21-41-000-001) and (Ref. AMM TASK 28-21-41-400-001). B.Do the check of the air release valve again.
5.Stop the APU: For GTCP 36-300 APU (Ref. AMM D/O 49-00-00-86) For APS 3200 APU (Ref. AMM D/O 49-00-00-86) For 131-9(A) APU (Ref. AMM TASK 49-00-00-860-009).

5. Close-up
Subtask 28-21-00-410-055-A

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) If necessary, close the APU access doors 315AL 316AR.

Subtask 28-21-00-942-066-A

B. Removal of Equipment
(1) Remove the safety barriers.
(2) Remove the access platform(s).
(3) Remove the WARNING NOTICE(S).
(4) Remove the ground support and maintenance equipment, the special and standard tools and all other items.

[Rev.10 from 2021] 2026.04.01 00:04:16 UTC