Inspection of the Overpressure Protector

TASK 28-12-41-200-001-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.

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 28-25-00-650-001-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 57-27-11-000-002-A	Removal of the Access Panel
TASK 57-27-11-400-002-A	Installation of the Access Panel
Overpressure Protectors - Wing and Vent Surge Tanks

3. Job Set-up
Subtask 28-12-41-941-050-A ** ON A/C NOT FOR ALL

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 28-12-41-860-054-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).

Subtask 28-12-41-010-050-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 applicable access panels (Ref. AMM TASK 57-27-11-000-002) and (Ref. AMM TASK 28-10-00-910-002):
(a) FOR [102QM] (PROTECTOR-OVERPRESSURE, L WING TK)
remove the access panel 540JB and 540KB
(b) FOR [103QM] (PROTECTOR-OVERPRESSURE, R WING TK)
remove the access panel 640JB and 640KB.

4. Procedure
Subtask 28-12-41-210-050-A ** ON A/C NOT FOR ALL

A. Inspection of the Overpressure Protector 102QM(103QM)

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

(1) Examine the overpressure protector (9) to make sure that:

there is no damage to the wire mesh (7)
there is no damage to the safety disc (8)
the sealant on the nuts (6) and the heads of the bolts (10) is in the correct condition
there is no damage to the wire mesh basket (11)
there is no corrosion.

5. Close-up
Subtask 28-12-41-410-050-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 applicable access panels (Ref. AMM TASK 57-27-11-400-002):
(a) FOR [102QM] (PROTECTOR-OVERPRESSURE, L WING TK)
install the access panel 540JB and 540KB
(b) FOR [103QM] (PROTECTOR-OVERPRESSURE, R WING TK)
install the access panel 640JB and 640KB.

Subtask 28-12-41-650-053-A ** ON A/C NOT FOR ALL

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 28-12-41-942-050-A ** ON A/C NOT FOR ALL

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 06:17:10 UTC