Installation of the Pressure Relief Door

TASK 54-53-11-400-803-A
Installation of the Pressure Relief Door

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.

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

ZONE: 470
ZONE: 480
FIN: 4020KM1 ** ON A/C NOT FOR ALL
FIN: 4020KM2 ** 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)- ADJUSTABLE

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.08BAA9)	Non Aqueous Cleaner-General - -
(Material No.14SBA1)	Textile-Lint free Cotton -

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
470	ENGINE 1 AFT PYLON
480	ENGINE 2 AFT PYLON

D. Referenced Information

REFERENCE	DESIGNATION
TASK 20-28-00-912-802-A	Electrical Bonding - General Maintenance Procedure
TASK 71-00-00-860-833-A	Procedure to Prevent Engine Motoring
TASK 78-30-00-040-805-A	Deactivation of the Thrust Reverser System for Ground Maintenance
TASK 78-30-00-440-805-A	Reactivation of the Thrust Reverser System after Ground Maintenance
Pressure Relief Door
Clearance Check

3. Job Set-up
Subtask 54-53-11-941-063-A ** ON A/C NOT FOR ALL

A. Safety Precautions
(1) Make sure that you did the procedure to prevent engine motoring
(Ref. AMM TASK 71-00-00-860-833).
(2) Make sure that the ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE is in position:
(a) For the left pylon, in zone 470
(b) For the right pylon, in zone 480.

Subtask 54-53-11-040-060-A ** ON A/C NOT FOR ALL

B. Deactivation of the Thrust Reverser

WARNING: MAKE SURE THAT THE THRUST REVERSER IS LOCKED. IF NOT, THE THRUST REVERSER CAN OPERATE ACCIDENTALLY AND CAUSE INJURY TO PERSONNEL AND/OR DAMAGE TO THE REVERSER.

(1) Make sure that the thrust reverser is unserviceable for maintenance (Ref. AMM TASK 78-30-00-040-805).

Subtask 54-53-11-110-054-A ** ON A/C NOT FOR ALL

C. Preparation for Installation
(1) Make sure that the parts retained from the removed component are clean and in the correct condition.
(2) Clean the parts retained from the removed component with Non Aqueous Cleaner-General - - (Material No.08BAA9) and Textile-Lint free Cotton - (Material No.14SBA1) , if necessary.
(3) Do an inspection of the component interfaces and the adjacent area.

4. Procedure
Subtask 54-53-11-420-056-A ** ON A/C NOT FOR ALL

A. Installation of the Pressure Relief Door

Pressure Relief Door ** ON A/C NOT FOR ALL

CAUTION: MAKE SURE THAT YOU INSTALL EACH OF THE SCREWS IN ITS CORRECT POSITION. THE SCREWS HAVE DIFFERENT LENGTHS. IF YOU DO NOT INSTALL EACH OF THE SCREWS IN ITS CORRECT POSITION, YOU CAN CAUSE DAMAGE.

(1) Put the pressure relief door (1) in position.
(2) Apply Sealants on the shanks of the screws (2), (3), (4) and (5).
(3) Install the screws (2), (3), (4) and (6) and the nuts (8), (9), (11) and (12).
(4) Install the screw (5), the bonding lead (7) and the nut (10).
(5) When you install the screw (5) and the nut (10), do the electrical bonding at the applicable location (Ref. AMM TASK 20-28-00-912-802).
(6) Tighten the nuts (8), (9), (10), (11) and (12).
(7) Close the pressure relief door (1).

Subtask 54-53-11-820-050-A ** ON A/C NOT FOR ALL

B. Check of the Clearance

Clearance Check ** ON A/C NOT FOR ALL

(1) Make sure that out-of-flush dimension A1 between the pressure relief door (1) and the overpressure access door (2) is 0 +0 mm or -1.1 mm (0.0000 +0.0000 in. or -0.0433 in.).
(2) Make sure that peripheral clearance J1 between the pressure relief door (1) and the overpressure access door (2) is 3 +2 mm or -2 mm (0.1181 +0.0787 in. or -0.0787 in.).

5. Close-up
Subtask 54-53-11-440-058-A ** ON A/C NOT FOR ALL

A. Reactivation of the Thrust Reverser
(1) Make the thrust reverser serviceable after maintenance (Ref. AMM TASK 78-30-00-440-805).

Subtask 54-53-11-942-057-A ** ON A/C NOT FOR ALL

B. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Remove the access platform(s).
(3) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 02:02:31 UTC