Inspection of the Wing-Tank Overpressure Protector Outlet

TASK 28-12-46-200-001-A
Inspection of the Wing-Tank 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.

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. 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 28-12-46-000-001-A	Removal of the Overpressure Protector Outlet
TASK 28-12-46-400-001-A	Installation of the Overpressure Protector Outlet
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
Outlet Overpressure Protector - Inner Cell ** ON A/C NOT FOR ALL
Outlet Overpressure Protector - Wing Tank ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 28-12-46-941-050-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) As necessary, use the applicable SAFETY BARRIERS, specified by the operator's instructions and your local regulations.

Subtask 28-12-46-650-052-A

B. Fuel 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).

Subtask 28-12-46-010-050-A ** ON A/C NOT FOR ALL

C. Get Access
(1) Put the ACCESS PLATFORM 5M (16 FT)- ADJUSTABLE below the applicable zone 540(640).
(2) Remove the overpressure protector outlet 540HB(640HB) (Ref. AMM TASK 28-12-46-000-001) and (Ref. AMM TASK 28-10-00-910-002).

Subtask 28-12-46-010-050-B ** ON A/C NOT FOR ALL

C. Get Access
(1) Put the ACCESS PLATFORM 5M (16 FT)- ADJUSTABLE below the applicable zone 540(640).
(2) Remove the overpressure protector outlet 540PB(640PB) (Ref. AMM TASK 28-12-46-000-001) and (Ref. AMM TASK 28-10-00-910-002).

4. Procedure
Subtask 28-12-46-210-050-A

A. Inspection of the Wing-Tank Overpressure Protector Outlet

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

(1) Examine the overpressure protector outlet (2) and the extension tube (6) to make sure that:

There is no damage
There is no corrosion
The overpressure protector outlet (2) is correctly installed on the access panel (3).

(2) Examine the nuts and the end of the bolts (4) to make sure that:

There is no damage
The sealant is in the correct condition.

(3) Examine the nuts and the end of the bolts (5) to make sure that:

There is no damage
The corrosion prevention material is in the correct condition.

(4) Examine the safety disc (1) to make sure that:
(a) You can see the white cross on the safety disc (1) clearly.
(b) The safety disc (1) is in one piece.
(c) If the safety disc (1) and/or white cross is(are) damaged, do the Step that follows:
1 Replace the applicable overpressure protector assembly (Ref. AMM TASK 28-12-46-000-001) (Ref. AMM TASK 28-12-46-400-001).

5. Close-up
Subtask 28-12-46-410-050-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) Install the overpressure protector outlet 540HB(640HB) (Ref. AMM TASK 28-12-46-400-001).

Subtask 28-12-46-410-050-B ** 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 the overpressure protector outlet 540PB(640PB) (Ref. AMM TASK 28-12-46-400-001).

Subtask 28-12-46-650-053-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 28-12-46-942-050-A

C. 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] 2026.04.02 06:17:12 UTC