Removal of the Low Pressure (LP) Air-Release-Valve

TASK 28-21-41-000-001-A
Removal of the Low Pressure (LP) Air-Release-Valve

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: 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: 86QM
FIN: 87QM

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	1	CAP - BLANKING
No specific	AR	CONTAINER 5 L (1.32 USGAL)
No specific	AR	SAFETY BARRIER(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [86QM] (VALVE-AIR RELEASE, L WING TK)
540CB
FOR [87QM] (VALVE-AIR RELEASE, R WING TK)
640CB

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 57-27-11-000-001-A	Removal of the Access Panel
Low-Pressure Air Release-Valve ** ON A/C NOT FOR ALL
Low-Pressure Air Release-Valve ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 28-21-41-941-053-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 (Ref. AMM TASK 28-10-00-910-001) when you do work in a fuel tank.
(2) Put the SAFETY BARRIER(S)S in position.

Subtask 28-21-41-650-053-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 28-21-41-010-050-A

C. Get Access
(1) Put the ACCESS PLATFORM 5M (16 FT)- ADJUSTABLE below zone 540(640).
(2) Remove the applicable wing access panel (Ref. AMM TASK 28-10-00-910-002), (Ref. AMM TASK 57-27-11-000-001):
(a) FOR [86QM] (VALVE-AIR RELEASE, L WING TK)
remove 540CB
(b) FOR [87QM] (VALVE-AIR RELEASE, R WING TK)
remove 640CB.

4. Procedure
Subtask 28-21-41-020-050-A

A. Removal of the Air Release Valve 86QM(87QM)
(1) Put the CONTAINER 5 L (1.32 USGAL) on the internal surface of the fuel tank below the LP air release valve (1).
(2) Remove the bolts (3) and the air release valve (1).
(3) Remove and discard the O-ring (2) and seal the RIB 8 connector with a CAP - BLANKING.

[Rev.10 from 2021] 2026.04.02 06:17:24 UTC