Removal of the Overpressure Protector Outlet

TASK 28-12-46-000-001-A
Removal of the Overpressure Protector Outlet

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: 540
ZONE: 640

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 5M (16 FT)- ADJUSTABLE
No specific	AR	SAFETY BARRIER(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
540	FUEL TANK
640	FUEL TANK
540PB, 640PB

C. Referenced Information

REFERENCE	DESIGNATION
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 57-55-11-000-004-A	Removal of the Flap Track Fairings Nos. 2, 3 and 4
Inner Cell Overpressure-Protector Outlet, 540HB(640HB) ** ON A/C NOT FOR ALL
Wing Tank Overpressure-Protector Outlet, 540PB(640PB) ** ON A/C NOT FOR ALL
Wing Tank Overpressure-Protector Outlet, 540PB(640PB) ** ON A/C NOT FOR ALL
Inner Cell Overpressure-Protector Outlet, 540HB(640HB) ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 28-12-46-941-053-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) and (Ref. AMM TASK 28-10-00-910-002).
(2) As necessary, use the applicable SAFETY BARRIERS, specified by the operator's instructions and your local regulations.

Subtask 28-12-46-860-051-A ** ON A/C NOT FOR ALL

B. Aircraft Maintenance Configuration
(1) Defuel the applicable fuel tank (Ref. AMM TASK 28-25-00-650-001).
(2) Drain the remaining fuel from the applicable fuel tank (Ref. AMM TASK 28-25-00-650-003).
(3) Put the ACCESS PLATFORM 5M (16 FT)- ADJUSTABLE below the applicable zone 540(640).

Subtask 28-12-46-860-051-B ** ON A/C NOT FOR ALL

CAUTION: WHEN YOU PUT THE ACCESS PLATFORM IN POSITION, BE CAREFUL NOT TO CAUSE DAMAGE TO THE VORTEX GENERATOR.

(3) Put the ACCESS PLATFORM 5M (16 FT)- ADJUSTABLE below the applicable zone 540(640).

4. Procedure
Subtask 28-12-46-020-051-A ** ON A/C NOT FOR ALL

A. Removal of the Overpressure-Protector Outlet

CAUTION: YOU MUST REMOVE AND INSTALL THE BOLTS IN THE SPECIFIED SEQUENCE. THIS WILL PREVENT DAMAGE TO THE ACCESS PANEL.

(1) Remove the bolts (4) in the sequence AB thru A.
(2) Remove the access panel 540HB (640HB).
(3) Put a protective cover around the pressure relief outlet (1).

Subtask 28-12-46-020-051-B ** ON A/C NOT FOR ALL

A. Removal of the Overpressure Protector Outlet
(1) Remove the forward and the aft fixed fairings from flap track No. 4 (Ref. AMM TASK 57-55-11-000-004).

CAUTION: YOU MUST REMOVE AND INSTALL THE BOLTS IN THE SPECIFIED SEQUENCE. THIS WILL PREVENT DAMAGE TO THE ACCESS PANEL.

(2) Remove the bolts (4) in the sequence AF thru A.
(3) Remove access panel 540PB ( 640PB).
(4) Put a protective cover around the pressure relief outlet (1).

[Rev.10 from 2021] 2026.04.02 07:01:33 UTC