Pressure Test of the Center-Tank Vent System

TASK 28-12-00-730-802-A
Pressure Test of the Center-Tank Vent System

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

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.

WARNING: MAKE SURE THAT YOU HAVE THE CORRECT FIRE FIGHTING EQUIPMENT AVAILABLE.

ZONE: 141
ZONE: 142
ZONE: 540
ZONE: 550

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 3M (10 FT)
No specific	1	ACCESS PLATFORM 4M (13 FT)
No specific	1	AIR SOURCE 0.3 TO 0.7 BAR (5 TO 10 PSI)- FILTERED, DRY
No specific	AR	SAFETY BARRIER(S)
No specific	AR	WARNING NOTICE(S)
No specific	AR	WATER - SOAPY SOLUTION
98D28004006000	1	CENTRE AND OUTER TEST TANK KIT
98D28004078000	1	INFLATION ADAPTOR
98D28004079000	1	VENT BLANK
98D28204003000	1	FUEL TEST HOSE

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.14CBB1)	Testing Medium-Leak Detection Bubbles -

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
141	WING CENTER BOX
142	WING CENTER BOX
540	FUEL TANK
550	VENT SURGE TANK
147AZ, 192MB, 550AB

D. Referenced Information

REFERENCE	DESIGNATION
TASK 12-11-28-650-003-A	Pressure Refuel with Automatic Control
TASK 12-11-28-650-004-A	Pressure Refuel with Manual Control
TASK 28-00-00-000-001-A	Removal of the Fuel Pipes
TASK 28-00-00-400-001-A	Installation of the Fuel Pipes
TASK 28-10-00-910-001-A	Safety Procedures When You Do Work in a Fuel Tank
TASK 28-10-00-910-002-A	Access to the Fuel Tanks and the Work Areas
TASK 28-12-44-000-004-A	Removal of the Check Valve
TASK 28-12-44-400-004-A	Installation of the Check Valve
TASK 28-12-47-000-001-A	Removal of the NACA Vent Intake
TASK 28-12-47-400-001-A	Installation of the NACA Vent Intake
TASK 28-25-00-650-001-A	Pressure Defuel
TASK 28-25-00-650-003-A	To Drain Remaining Fuel from the Wing Tanks and the Center Tank
TASK 28-25-00-650-003-A-01	To Drain Remaining Fuel from the Wing Tanks and the Center Tank
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
TASK 57-17-11-000-001-A	Removal of Access Cover 147AZ(148AZ)
TASK 57-17-11-000-001-B	Removal of Access Cover 148AZ or/and the ACT-Equipment Support Door
TASK 57-17-11-400-001-A	Installation of Access Cover 147AZ(148AZ)
TASK 57-17-11-400-001-B	Installation of Access Cover 148AZ or/and the ACT-Equipment Support-Door
TASK 57-27-11-000-002-A	Removal of the Access Panel
TASK 57-27-11-400-002-A	Installation of the Access Panel
Center-Tank Vent Pipe - Location and Detail
Center-Tank Vent Pipe - Location and Detail

3. Job Set-up
Subtask 28-12-00-941-066-A

A. Safety Precautions

WARNING: BEFORE YOU DO WORK IN OR NEAR A FUEL TANK, MAKE SURE THAT YOU OBEY ALL THE SAFETY PROCEDURES. THIS WILL PREVENT INJURY TO PERSONS AND/OR DAMAGE TO THE AIRCRAFT.

(1) You must obey the safety procedures when you do work in a fuel tank (Ref. AMM TASK 28-10-00-910-001).
(2) As necessary, use the applicable SAFETY BARRIERS, specified by the operator's instructions and your local regulations.
(3) In the cockpit (zone 210), put a WARNING NOTICE(S) in position:

On the overhead panel, on fuel control-panel 40VU, to tell persons not to operate the fuel system
On the flight controls, to tell persons not to operate the flight controls.

(4) Open refuel/defuel control-panel door 192MB.
(5) On refuel/defuel control-panel 800VU, put the WARNING NOTICE(S) in position to tell persons not to refuel the aircraft.
(6) Close refuel/defuel control-panel door 192MB.

Subtask 28-12-00-860-068-A

B. Aircraft Maintenance Configuration
(1) Defuel the center tank and the wing tanks (Ref. AMM TASK 28-25-00-650-001).
(2) Drain the remaining fuel from the wing tanks and the center tank (Ref. AMM TASK 28-25-00-650-003).

Subtask 28-12-00-010-066-A

C. Get Access
(1) Open the left Main Landing Gear (MLG) door (Ref. AMM TASK 32-12-00-010-001).
(2) Put an ACCESS PLATFORM 4M (13 FT) in position below applicable access panel 550AB.
(3) Remove access panel 550AB (Ref. AMM TASK 57-27-11-000-002).
(4) Remove the left NACA vent intake (Ref. AMM TASK 28-12-47-000-001).
(5) Put an ACCESS PLATFORM 3M (10 FT) in position below access cover 147AZ.
(6) Remove access cover 147AZ (Ref. AMM TASK 28-10-00-910-002) and (Ref. AMM TASK 57-17-11-000-001).

Subtask 28-12-00-480-051-A

CAUTION: DO NOT USE THE FUEL PIPES AND THE EQUIPMENT AS HANDHOLDS WHEN YOU DO WORK IN A FUEL TANK. THIS WILL PREVENT DAMAGE TO THEM.

CAUTION: YOU MUST ALWAYS PUT CAPS ON DISCONNECTED FUEL VENT PIPES. IF YOU DO NOT DO THIS, CONTAMINATION OF THE FUEL VENT PIPES CAN OCCUR.

CAUTION: WHEN YOU DO WORK ON OR NEAR FUEL VENT PIPES, BE CAREFUL NOT TO CAUSE DAMAGE TO THEM.

D. Installation of the Adapters and Blanks to the Center-Tank Vent System

Center-Tank Vent Pipe - Location and Detail

NOTE: Use the applicable items from the 98D28004006000 CENTRE AND OUTER TEST TANK KIT.

NOTE: TEST RIG-AIR PRESSURE (98L28004035000) is available in the 98D28004006000 CENTRE AND OUTER TEST TANK KIT.

(1) Remove center-tank fuel-drain-check-valve 93QM (Ref. AMM TASK 28-12-44-000-004).
(2) Install an 98D28004078000 INFLATION ADAPTOR to the outlet in position of center-tank fuel-drain-check-valve 93QM.
(3) Set the 98D28004078000 INFLATION ADAPTOR to the closed position.
(4) Connect a 98D28204003000 FUEL TEST HOSE to the 98D28004078000 INFLATION ADAPTOR.
(5) Connect the 98D28204003000 FUEL TEST HOSE to the TEST RIG-AIR PRESSURE (98L28004035000).
(6) On the TEST RIG-AIR PRESSURE (98L28004035000), make sure that the pressure isolation valve is in the closed position.
(7) Connect an AIR SOURCE 0.3 TO 0.7 BAR (5 TO 10 PSI)- FILTERED, DRY to the TEST RIG-AIR PRESSURE (98L28004035000).
(8) Disconnect the center-tank vent pipe at the connection to the funnel (Ref. AMM TASK 28-00-00-000-001).
(9) Install the 98D28004079000 VENT BLANK to the center-tank vent pipe.

4. Procedure
Subtask 28-12-00-730-051-A

A. Free Flow Air-Test and the Seal Integrity Pressure-Test of the Center-Tank Vent System

NOTE: Airbus recommends you to keep the test air pressure less than or equal to 0.69 bar (10 psi).

(1) Do the free flow air test as follows:

WARNING: WHEN YOU USE COMPRESSED AIR:

USE THE CORRECT PROTECTION (FACE SHIELD OR GOGGLES)
DO NOT POINT THE AIRFLOW AT YOURSELF OR OTHER PERSONS.

LOOSE PARTICLES AND/OR HIGH PRESSURE AIR CAN CAUSE INJURY.

(a) Open the valve on the 98D28004078000 INFLATION ADAPTOR.
(b) Set the pressure relief valve on the TEST RIG-AIR PRESSURE (98L28004035000) to HOLD position.
(c) Slowly open the pressure isolation valve on the TEST RIG-AIR PRESSURE (98L28004035000).
(d) Increase the air pressure until the pressure gage on the 98D28004078000 INFLATION ADAPTOR shows 0.69 bar (10 psi).
(e) Make sure that there is a free flow of air from the center-tank vent pipe at RIB 22:
1 If there is no free flow of air, stop the test.
2 Release the air pressure at a rate of not more than 0.07 bar (1 psi)/sec.
3 Make sure that there is no blockage in the system.
(2) When the free flow air-test is completed satisfactorily:
(a) Slowly close the pressure isolation valve on the TEST RIG-AIR PRESSURE (98L28004035000) until:

The pressure gage on the 98D28004078000 INFLATION ADAPTOR shows 0 bar (0 psi).

(b) Install the 98D28204002000 CTR TANK VENT BLANK to the center-tank vent pipe at RIB 22.
(3) Do the seal integrity pressure-test as follows:
(a) Slowly open the pressure isolation valve on the TEST RIG-AIR PRESSURE (98L28004035000). Increase the air pressure until the pressure gage on the 98D28004078000 INFLATION ADAPTOR shows 0.69 bar (10 psi).
(b) Let the air pressure become stable at 0.69 bar (10 psi) at the 98D28004078000 INFLATION ADAPTOR.
(c) Close the valve on the 98D28004078000 INFLATION ADAPTOR.
(d) Slowly close the pressure isolation valve on the TEST RIG-AIR PRESSURE (98L28004035000).
(e) Keep the center-tank vent pipes pressure at 0.69 bar (10 psi) for a minimum of 15 minutes.
(f) If the pressure drop is less than 0.034 bar (0.5 psi) after 15 minutes, then the test is satisfactory.
(g) If the pressure drop is more than 0.034 bar (0.5 psi) after 15 minutes, then the test is unsatisfactory.
(h) Use WATER - SOAPY SOLUTION or Testing Medium-Leak Detection Bubbles - (Material No.14CBB1) to find the leaks. Do an approved repair and do the test again.

5. Close-up
Subtask 28-12-00-080-051-A

A. Removal of the Adapters and Blanks from the Center-Tank Vent System

CAUTION: MAKE SURE THAT ALL THE BLEED/INFLATION ADAPTERS AND BLANKS ARE REMOVED FROM THE FUEL PIPE SYSTEM. IF THE BLANKS ARE NOT REMOVED, DAMAGE WILL OCCUR TO THE AIRCRAFT.

(1) Prepare the components for installation:
(a) Do a visual inspection of the component interface and/or the adjacent area.
(2) Remove the 98D28204002000 CTR TANK VENT BLANK and install the NACA Vent Intake in the RIB bay 22-23 as follows:
(a) Remove the 98D28204002000 CTR TANK VENT BLANK from the center-tank vent pipe in the RIB bay 22-23.
(b) Install the left NACA vent intake (Ref. AMM TASK 28-12-47-400-001).
(3) Remove the 98D28004078000 INFLATION ADAPTOR and install the center-tank vent pipe in the center tank as follows:
(a) Remove the 98D28004078000 INFLATION ADAPTOR from the outlet.
(b) Install the center-tank fuel-drain check-valve 93QM (Ref. AMM TASK 28-12-44-400-004).
(c) Remove the 98D28004079000 VENT BLANK from the center-tank vent pipe.
(d) Connect the center-tank vent pipe at the connection to the funnel (Ref. AMM TASK 28-00-00-400-001).

Subtask 28-12-00-410-064-A

B. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Install access cover 147AZ (Ref. AMM TASK 57-17-11-400-001).
(3) Install access panel 550AB (Ref. AMM TASK 57-27-11-400-002).
(4) Close the left MLG door (Ref. AMM TASK 32-12-00-410-001).

Subtask 28-12-00-650-062-A

C. Refuel
(1) Refuel the applicable wing and center tanks (Ref. AMM TASK 12-11-28-650-003) or (Ref. AMM TASK 12-11-28-650-004).

Subtask 28-12-00-942-070-A

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

[Rev.10 from 2021] 2026.04.02 07:01:21 UTC