Installation of the Overpressure Protector

TASK 28-12-41-400-003-A
Installation of the Overpressure Protector

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

WARNING: THIS PROCEDURE USES A FUEL SYSTEM ITEM THAT IS IN A CATEGORY KNOWN AS A CRITICAL DESIGN CONFIGURATION CONTROL LIMITATION (CDCCL). CDCCL IDENTIFIES AN ITEM THAT CAN BE THE SOURCE OF A POSSIBLE FUEL TANK IGNITION. YOU MUST KEEP ALL CDCCL ITEMS IN THE APPROVED CONFIGURATION. DAMAGE, WEAR OR CHANGES TO A CDCCL ITEM CAN CAUSE A POSSIBLE FUEL TANK EXPLOSION.

WARNING: MAKE SURE THAT THE FLIGHT CONTROL SAFETY-LOCKS AND THE WARNING NOTICES ARE IN POSITION.

WARNING: MAKE SURE THAT THE GROUND SAFETY-LOCKS ARE IN POSITION ON THE LANDING GEAR. THIS WILL PREVENT UNWANTED MOVEMENT OF THE LANDING GEAR, AND THUS POSSIBLE INJURY TO PERSONS AND DAMAGE TO THE AIRCRAFT AND/OR EQUIPMENT.

ZONE: 141
ZONE: 142
ZONE: 540
FIN: 96QM

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

REFERENCE	QTY	DESIGNATION
No specific	AR	ACCESS PLATFORM 2M (6 FT)
No specific	1	ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE
No specific	AR	ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE
No specific	AR	SAFETY BARRIER(S)

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.01ABA1)	Turbine Fuel-- Kerosene -
(Material No.06HAA1)	Coating Sealant-Fuel Tank Brushable -
(Material No.08BAA9)	Non Aqueous Cleaner-General - -
(Material No.14SBA1)	Textile-Lint free Cotton -

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
141	WING CENTER BOX
142	WING CENTER BOX
540	FUEL TANK
540AB, 540BZ
147AZ
148AZ

D. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
3	O-RING	AIPC 28-12-05-02-020
3	O-RING	AIPC 28-12-85-02-020

E. Referenced Information

REFERENCE	DESIGNATION
TASK 12-11-28-650-003-A	Pressure Refuel with Automatic Control
TASK 12-11-28-650-005-A	Pressure Refuel without Electrical Power
TASK 20-28-00-912-802-A	Electrical Bonding - General Maintenance Procedure
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 28-10-00-910-001-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 28-25-00-650-001-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 28-25-00-869-001-A	Fuel Transfer
TASK 31-60-00-860-001-A	EIS Start Procedure
TASK 31-60-00-860-002-A	EIS Stop Procedure
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 57-27-11-000-001-A	Removal of the Access Panel
TASK 57-27-11-400-001-A	Installation of the Access Panel
TASK 57-27-12-000-002-A	Removal of the Rib 2 Access Panel 540AZ(640AZ) or 540BZ(640BZ)
TASK 57-27-12-400-002-A	Installation of the Rib 2 Access Panel 540AZ (640AZ) or 540BZ (640BZ)
Overpressure Protector - Center Tank ** ON A/C NOT FOR ALL
Overpressure Protector - Center Tank ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 28-12-41-941-068-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 fuel safety procedures when you do work in a fuel tank (Ref. AMM TASK 28-10-00-910-001).
(2) Put the SAFETY BARRIER(S) in position.

Subtask 28-12-41-860-052-A ** ON A/C NOT FOR ALL

B. Aircraft Maintenance Configuration
(1) Make sure that the center tank is defueled (Ref. AMM TASK 28-25-00-650-001).
(2) Make sure that the remaining fuel is drained from the center tank (Ref. AMM TASK 28-25-00-650-003).
(3) Make sure that the LH MLG door is open (Ref. AMM TASK 32-12-00-010-001).
(4) Make sure that a 460005835 SLEEVE - GROUND LOCK is installed on the LH MLG door actuator.
(5) Make sure that an ACCESS PLATFORM 2M (6 FT) is in position below zone 147.
(6) Make sure that an ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE is in position below zone 540.
(7) Make sure that access cover 147AZ is removed (Ref. AMM TASK 57-17-11-000-001) and (Ref. AMM TASK 28-10-00-910-002).
(8) Make sure that access panel 540AB is removed (Ref. AMM TASK 57-27-11-000-001) and (Ref. AMM TASK 28-10-00-910-002).
(9) Make sure that surge door 540BZ is open and a 98D57004014000 HOOK-COVER (RIB2-SURGE DOORS) is installed.

Subtask 28-12-41-860-052-C ** ON A/C NOT FOR ALL

B. Aircraft Maintenance Configuration
(1) Make sure that the center tank is defueled (Ref. AMM TASK 28-25-00-650-001).
(2) Make sure that the remaining fuel is drained from the center tank (Ref. AMM TASK 28-25-00-650-003).
(3) Make sure that the LH MLG door is open (Ref. AMM TASK 32-12-00-010-001).
(4) Make sure that a 460005835 SLEEVE - GROUND LOCK is installed on the LH MLG door actuator.
(5) Make sure that an ACCESS PLATFORM 2M (6 FT) is in position below zone 147.
(6) Make sure that an ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE is in position below zone 540.
(7) Make sure that the ACT equipment support-door or access cover 148AZ is removed (Ref. AMM TASK 57-17-11-000-001) and (Ref. AMM TASK 28-10-00-910-002).
(8) Make sure that access panel 540AB is removed (Ref. AMM TASK 57-27-11-000-001) and (Ref. AMM TASK 28-10-00-910-002).
(9) Make sure that surge door 540BZ is open and a 98D57004014000 HOOK-COVER (RIB2-SURGE DOORS) is installed.

Subtask 28-12-41-860-052-D ** ON A/C NOT FOR ALL

B. Aircraft Maintenance Configuration
(1) Make sure that the center tank is defueled (Ref. AMM TASK 28-25-00-650-001).
(2) Make sure that the remaining fuel is drained from the center tank (Ref. AMM TASK 28-25-00-650-003).
(3) Make sure that the left Main Landing Gear (MLG) door is removed (Ref. AMM TASK 32-12-00-010-001).
(4) Make sure that the 460005835 SLEEVE - GROUND LOCK is installed on the left MLG-door actuator.
(5) Make sure that the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE is in position below the zone 147.
(6) Make sure that the ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE is in position below the zone 540.
(7) Make sure that access cover 147AZ is removed (Ref. AMM TASK 57-17-11-000-001) and (Ref. AMM TASK 28-10-00-910-002).
(8) Make sure that access panel 540AB is removed (Ref. AMM TASK 57-27-11-000-001) and (Ref. AMM TASK 28-10-00-910-002).
(9) Make sure that RIB2 access panel 540BZ is removed (Ref. AMM TASK 57-27-12-000-002).

4. Procedure
Subtask 28-12-41-420-055-A

A. Preparation for Installation
(1) Clean the component interface and /or the adjacent area with a Textile-Lint free Cotton - (Material No.14SBA1) made moist with Non Aqueous Cleaner-General - - (Material No.08BAA9) .
(2) Do an inspection of the component interfaces and the adjacent area.
(3) Make sure that the parts retained from the removed component are clean and in the correct condition.
(4) Lubricate the new AIPC 28-12-05-02-020 O-RING (3) or AIPC 28-12-85-02-020 O-RING (3) with Turbine Fuel-- Kerosene - (Material No.01ABA1) .

Subtask 28-12-41-420-052-A

B. Installation of the Overpressure Protector 96QM
(1) Install the new O-ring (3) on the overpressure protector (4).
(2) Put the overpressure protector (4) in position. Engage the location dowel in the dowel hole (2).
(3) Install and tighten the bolts (1).
(4) Make sure that the overpressure protector (4) is correctly bonded to RIB 1:

WARNING: THIS INSTRUCTION IS APPLICABLE TO A CRITICAL DESIGN CONFIGURATION CONTROL LIMITATION (CDCCL) ITEM. CAREFULLY OBEY ALL GIVEN INSTRUCTIONS WHEN YOU DO THIS STEP. IF YOU DO NOT OBEY THESE INSTRUCTIONS, A DANGEROUS CONDITION CAN OCCUR THAT CAN CAUSE A POSSIBLE FUEL TANK EXPLOSION.

(a) Do a bonding check between the overpressure protector (4) and RIB 1 (Ref. AMM TASK 20-28-00-912-802). The bonding resistance must be less than 10 milliohms.
(5) Apply Coating Sealant-Fuel Tank Brushable - (Material No.06HAA1) over the ends of the bolts (1).

5. Close-up
Subtask 28-12-41-410-056-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 98D57004014000 HOOK-COVER (RIB2-SURGE DOORS) and carefully close the surge door 540BZ.
(3) Install the wing access panel 540AB, (Ref. AMM TASK 57-27-11-400-001).

Subtask 28-12-41-410-056-C ** 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) Install RIB2 access panel 540BZ (Ref. AMM TASK 57-27-12-400-002).
(3) Install access panel 540AB (Ref. AMM TASK 57-27-11-400-001).

Subtask 28-12-41-790-052-A ** ON A/C NOT FOR ALL

B. Leak Test of the Overpressure Protector - Installation
(1) Fully refuel the LH wing tank (Ref. AMM TASK 12-11-28-650-005).
(2) In the center tank at the overpressure protector/Rib 1 interface, inspect for signs of leaks. No leaks permitted.

Subtask 28-12-41-790-052-B ** ON A/C NOT FOR ALL

NOTE: A small fuel leak at the pick-up for the jet pump is permitted.

Subtask 28-12-41-860-056-A ** ON A/C NOT FOR ALL

C. Preparation to Continue the Test
(1) Install the access panel 147AZ (Ref. AMM TASK 57-17-11-400-001).
(2) Make sure that the center tank and the RH wing tank are empty of fuel. If necessary, defuel the tank(s) (Ref. AMM TASK 28-25-00-650-001).

NOTE: The LH wing tank stays full of fuel.

(3) In the flight compartment on the panel 40VU, make sure that these pushbutton switches (P/BSW's) are set as follows:

CTR TK MODE SEL released out (MAN)
L TK PUMPS 1 and 2 released out (OFF)
R TK PUMPS 1 and 2 released out (OFF)
CTR TK PUMPS 1 and 2 released out (OFF)
X-FEED released out (lights off).

(4) Open the access panel 192MB.
(5) On the panel 800VU, make sure that the MODE SELECT switch is in the OFF position (the defuel/transfer valve closed).
(6) Close the access panel 192MB.
(7) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).
(8) Do the EIS start procedure (ECAM only) (Ref. AMM TASK 31-60-00-860-001), then:
(a) On the ECAM control panel (CP), push (in) the fuel P/BSW.
(b) Make sure that the FUEL PAGE shows on the ECAM lower display unit (DU).

Subtask 28-12-41-860-056-C ** ON A/C NOT FOR ALL

NOTE: The LH wing tank stays full of fuel.

(3) In the flight compartment on the panel 40VU, make sure that these pushbutton switches (P/BSW's) are set as follows:

CTR TK MODE SEL released out (MAN)
L TK PUMPS 1 and 2 released out (OFF)
R TK PUMPS 1 and 2 released out (OFF)
CTR TK PUMPS 1 and 2 released out (OFF)
X-FEED released out (lights off).

(4) Open the access panel 622KB.
(5) On the panel 800VU, make sure that the MODE SELECT switch is in the OFF position (the defuel/transfer valve closed).
(6) Close the access panel 622KB.
(7) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).
(8) Do the EIS start procedure (ECAM only) (Ref. AMM TASK 31-60-00-860-001), then:
(a) On the ECAM control panel (CP), push (in) the fuel P/BSW.
(b) Make sure that the FUEL PAGE shows on the ECAM lower display unit (DU).

Subtask 28-12-41-860-056-D ** ON A/C NOT FOR ALL

C. Preparation to Continue the Test
(1) Install the ACT-Equipment Support Door or the access cover 148AZ (Ref. AMM TASK 57-17-11-400-001).
(2) Make sure that the center tank and the RH wing tank are empty of fuel. If necessary, defuel the tank(s) (Ref. AMM TASK 28-25-00-650-001).

NOTE: The LH wing tank stays full of fuel.

(3) In the flight compartment on the panel 40VU, make sure that these pushbutton switches (P/BSW's) are set as follows:

CTR TK MODE SEL released out (MAN)
L TK PUMPS 1 and 2 released out (OFF)
R TK PUMPS 1 and 2 released out (OFF)
CTR TK PUMPS 1 and 2 released out (OFF)
X-FEED released out (lights off).

Subtask 28-12-41-790-053-A

D. Check for Fuel Transfer
(1) Monitor the ECAM lower DU for 10 minutes. Make sure that the fuel in the LH wing tank does not move into the center tank.

Subtask 28-12-41-650-052-A

E. Fuel Configuration
(1) 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).

Subtask 28-12-41-410-059-A

F. Close Access
(1) Remove the access platform(s).
(2) Close the LH MLG door (Ref. AMM TASK 32-12-00-410-001).

Subtask 28-12-41-860-057-A

G. Aircraft Maintenance 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 28-12-41-942-056-A

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

[Rev.10 from 2021] 2026.04.02 06:17:09 UTC