Installation of the Overpressure Protector

TASK 28-12-41-400-002-A
Installation of the Overpressure Protector

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

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.

FIN: 102QM ** ON A/C NOT FOR ALL
FIN: 103QM ** ON A/C NOT FOR ALL

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 3M (10 FT)
No specific	AR	SAFETY BARRIER(S)

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.01ABA1)	Turbine Fuel-- Kerosene -
(Material No.03HBD9)	Synthetic Ester base Grease-General Purpose Low Temp -
(Material No.06ABA1)	Polysulfide 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
540JB, 540KB, 640JB, 640KB
FOR [102QM] (PROTECTOR-OVERPRESSURE, L WING TK)
540JB, 540KB
FOR [103QM] (PROTECTOR-OVERPRESSURE, R WING TK)
640JB, 640KB

D. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
3	O-RING	AIPC 28-12-05-33-030
3	O-RING	AIPC 28-12-85-24-020

E. Referenced Information

REFERENCE	DESIGNATION
TASK 12-11-28-650-003-A	Pressure Refuel with Automatic Control
TASK 20-28-00-912-802-A	Electrical Bonding - General Maintenance Procedure
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 28-25-00-869-001-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 Protector - Inner/Outer Cell

3. Job Set-up
Subtask 28-12-41-941-067-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) Make sure that the SAFETY BARRIER(S) are in position.

Subtask 28-12-41-860-051-A ** ON A/C NOT FOR ALL

B. Aircraft Maintenance Configuration
(1) Make sure that the applicable fuel tank is defueled (Ref. AMM TASK 28-25-00-650-001).
(2) Make sure that the remaining fuel has been drained from the applicable fuel tank (Ref. AMM TASK 28-25-00-650-001).
(3) Make sure that the ACCESS PLATFORM 3M (10 FT) is below the applicable zone 540 (640).
(4) Make sure that the applicable access panels are removed 540JB 640JB and 540KB 640KB (Ref. AMM TASK 57-27-11-000-002) and (Ref. AMM TASK 28-10-00-910-002).

4. Procedure
Subtask 28-12-41-420-054-A ** ON A/C NOT FOR ALL

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 28-12-05-33-030 O-RING (3) or AIPC 28-12-85-24-020 O-RING (3) with Turbine Fuel-- Kerosene - (Material No.01ABA1) .

Subtask 28-12-41-420-051-C ** ON A/C NOT FOR ALL

B. Installation of the Overpressure Protector 102QM(103QM)
(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).

NOTE: You must bond one of the bolts (1) (Ref. AMM TASK 20-28-00-912-802).

(3) Apply a thin layer of Synthetic Ester base Grease-General Purpose Low Temp - (Material No.03HBD9) to the threads of the bolts (1) then install and tighten the bolts (1).
(4) Make sure that the overpressure protector (4) is correctly bonded to RIB15:

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 15 (Ref. AMM TASK 20-28-00-912-802). The bonding resistance must be less than 10 milliohms.
(5) Apply Polysulfide Sealant-Fuel Tank Brushable - (Material No.06ABA1) over the ends of the bolts (1) and the edge of the overpressure protector (4) where it touches RIB 15.

5. Close-up
Subtask 28-12-41-410-055-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 540JB 540KB

(b) FOR [103QM] (PROTECTOR-OVERPRESSURE, R WING TK)
install 640JB 640KB.

Subtask 28-12-41-650-051-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) and (Ref. AMM TASK 28-25-00-869-001).

Subtask 28-12-41-942-054-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 06:17:09 UTC