Inspection of the Overpressure Protector

TASK 28-12-41-200-002-A
Inspection of the Overpressure Protector

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: 141
ZONE: 142
ZONE: 540

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)
No specific	AR	WARNING NOTICE(S)
98D57004014000	1	HOOK-COVER (RIB2-SURGE DOORS)

B. Work Zones and Access Panels

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

C. Referenced Information

REFERENCE	DESIGNATION
TASK 12-11-28-650-003-A	Pressure Refuel with Automatic Control
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 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 28-12-41-941-051-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.
(3) Put a WARNING NOTICE(S) in position to tell persons not to operate the landing gear doors.

Subtask 28-12-41-860-055-A

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

Subtask 28-12-41-010-052-A ** ON A/C NOT FOR ALL

C. Get Access

WARNING: MAKE SURE THAT THE TRAVEL RANGES OF THE LANDING GEAR DOORS ARE CLEAR.

(1) Open the LH MLG door (Ref. AMM TASK 32-12-00-010-001).
(2) Make sure that the 460005835 SLEEVE - GROUND LOCK is installed on the LH MLG door actuator.
(3) Put the ACCESS PLATFORM 2M (6 FT) below the zone 147.
(4) Remove the access panel 147AZ (Ref. AMM TASK 57-17-11-000-001) and (Ref. AMM TASK 28-10-00-910-002).
(5) Put the ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE below the zone 540.
(6) Remove the access panel 540AB (Ref. AMM TASK 57-27-11-000-001) and (Ref. AMM TASK 28-10-00-910-002).
(7) Open the surge door 540BZ.
(8) Install the 98D57004014000 HOOK-COVER (RIB2-SURGE DOORS) to hold the surge door open.

Subtask 28-12-41-010-052-C ** ON A/C NOT FOR ALL

C. Get Access

WARNING: MAKE SURE THAT THE TRAVEL RANGES OF THE LANDING GEAR DOORS ARE CLEAR.

(1) Open the LH MLG door (Ref. AMM TASK 32-12-00-010-001).
(2) Make sure that the 460005835 SLEEVE - GROUND LOCK is installed on the LH MLG door actuator.
(3) Put the ACCESS PLATFORM 2M (6 FT) below the zone 147.
(4) Remove the ACT-Equipment Support Door (Ref. AMM TASK 57-17-11-000-001) and (Ref. AMM TASK 28-10-00-910-002).
(5) Put the ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE below the zone 540.
(6) Remove the access panel 540AB (Ref. AMM TASK 57-27-11-000-001) and (Ref. AMM TASK 28-10-00-910-002).
(7) Open the surge door 540BZ.
(8) Install the 98D57004014000 HOOK-COVER (RIB2-SURGE DOORS) to hold the surge door open.

Subtask 28-12-41-010-052-D ** ON A/C NOT FOR ALL

C. Get Access

WARNING: MAKE SURE THAT THE TRAVEL RANGES OF THE LANDING GEAR DOORS ARE CLEAR.

(1) Remove the left Main Landing Gear (MLG) door (Ref. AMM TASK 32-12-00-010-001).
(2) Make sure that the 460005835 SLEEVE - GROUND LOCK is installed on the left MLG-door actuator.
(3) Put the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position below the zone 147.
(4) Remove access cover 147AZ (Ref. AMM TASK 57-17-11-000-001) and (Ref. AMM TASK 28-10-00-910-002).
(5) Put the ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE in position below the zone 540.
(6) Remove access panel 540AB (Ref. AMM TASK 57-27-11-000-001) and (Ref. AMM TASK 28-10-00-910-002).
(7) Remove RIB2 access panel 540BZ (Ref. AMM TASK 57-27-12-000-002).

4. Procedure
Subtask 28-12-41-210-051-A

A. Inspection of the Overpressure Protector 96QM

CAUTION: DO NOT APPLY PRESSURE TO THE SAFETY DISC BECAUSE IT WILL EASILY BREAK.

(1) Examine the overpressure protector (4) to make sure that:

there is no damage to the wire mesh (2)
there is no damage to the safety disc (3)
there is no corrosion
the sealant on and around the nuts (1) and the head of the bolts (5) is in the correct condition
there is no damage to the wire mesh basket (6).

5. Close-up
Subtask 28-12-41-410-051-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 access panel 540AB (Ref. AMM TASK 57-27-11-400-001).
(4) Install the access panel 147AZ (Ref. AMM TASK 57-17-11-400-001).

Subtask 28-12-41-410-051-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) Remove the 98D57004014000 HOOK-COVER (RIB2-SURGE DOORS) and carefully close the surge door 540BZ.
(3) Install the access panel 540AB (Ref. AMM TASK 57-27-11-400-001).
(4) Install the ACT-Equipment Support Door (Ref. AMM TASK 57-17-11-400-001).

Subtask 28-12-41-410-051-D ** 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).
(4) Install access cover 147AZ (Ref. AMM TASK 57-17-11-400-001).

Subtask 28-12-41-650-054-A

B. 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 28-12-41-942-051-A

C. Removal of Equipment
(1) Remove the safety barriers.
(2) Remove the access platform(s).
(3) Remove the WARNING NOTICE(S).
(4) Close the LH MLG door (Ref. AMM TASK 32-12-00-410-001).
(5) Remove the ground support and maintenance equipment, the special and standard tools and all other items.

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