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

TASK 28-21-41-400-001-A
Installation of the Low Pressure (LP) Air-Release Valve

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.

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

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	AR	CONTAINER 5 L (1.32 USGAL)
No specific	AR	SAFETY BARRIER(S)
No specific	Torque wrench: range to between 4 and 3 m.N (35.40 and 26.55 lbf.in )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.01ABA1)	Turbine Fuel-- Kerosene -
(Material No.03FAB1)	Mineral Oil base Grease-- Vaseline or Petrolatum -
(Material No.06ABB1)	Polysulfide Sealant-Fuel Tank Fillet -
(Material No.08BAA9)	Non Aqueous Cleaner-General - -
(Material No.14SBA1)	Textile-Lint free Cotton -

C. 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

D. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
2	O-RING	AIPC 28-21-05-24-200
2	O-RING	AIPC 28-21-85-20-360

E. Referenced Information

REFERENCE	DESIGNATION
TASK 12-11-28-650-003-A	Pressure Refuel with Automatic Control
TASK 12-11-28-650-004-A	Pressure Refuel with Manual Control
TASK 24-41-00-861-002-A	Energize the Aircraft Electrical Circuits from the External Power
TASK 24-41-00-861-002-A-01	Energize the Aircraft Electrical Circuits from the APU
TASK 24-41-00-861-002-A-02	Energize the Aircraft Electrical Circuits from Engine 1(2)
TASK 24-41-00-862-002-A	De-energize the Aircraft Electrical Circuits Supplied from the External Power
TASK 24-41-00-862-002-A-01	De-energize the Aircraft Electrical Circuits Supplied from the APU
TASK 24-41-00-862-002-A-02	De-energize the Aircraft Electrical Circuits Supplied from the Engine 1(2)
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 57-27-11-000-001-A	Removal of the Access Panel
TASK 57-27-11-400-001-A	Installation 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 28-21-41-941-054-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) Make sure that the SAFETY BARRIER(S)S are in position.

Subtask 28-21-41-860-051-A

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 28-25-00-650-003).
(3) Make sure that the ACCESS PLATFORM 5M (16 FT)- ADJUSTABLE is below the applicable access panel 540CB(640CB).
(4) Make sure that the applicable access panel 540CB(640CB) is removed (Ref. AMM TASK 28-10-00-910-002), (Ref. AMM TASK 57-27-11-000-001).
(5) Make sure that the CONTAINER 5 L (1.32 USGAL) is in position below the applicable LP air release valve (1).

4. Procedure
Subtask 28-21-41-420-051-A

A. Preparation for Installation
(1) Clean the component interfaces and the adjacent areas with a Textile-Lint free Cotton - (Material No.14SBA1) made moist with Non Aqueous Cleaner-General - - (Material No.08BAA9) .
(2) Make sure that the parts retained from the removed component are clean and in the correct condition.
(3) Do an inspection of the component interfaces and the adjacent area.
(4) Lubricate the new AIPC 28-21-05-24-200 O-RING (2) or AIPC 28-21-85-20-360 O-RING (2) with Turbine Fuel-- Kerosene - (Material No.01ABA1) or Mineral Oil base Grease-- Vaseline or Petrolatum - (Material No.03FAB1) .

Subtask 28-21-41-420-050-A

B. Installation of Air Release Valve 86QM (87QM)
(1) Install the O-ring (2) in the groove on the LP air-release valve (1).
(2) Remove the CAP - BLANKING from RIB8 connector.
(3) Install the LP air-release valve (1) with the bolts (3).
(4) TORQUE the bolts (3) to between 4 and 3 m.N (35.40 and 26.55 lbf.in )

.
(5) Apply a Polysulfide Sealant-Fuel Tank Fillet - (Material No.06ABB1) to the ends of the bolts (3).

Subtask 28-21-41-860-052-A ** ON A/C NOT FOR ALL

C. Preparation For Test
(1) Make sure that the opposite fuel tank (to that in which you installed the LP air release valve (1)) or center fuel tank contains sufficient fuel for the test. If necessary, refuel the opposite fuel tank or the center fuel tank (Ref. AMM TASK 12-11-28-650-004).
(2) Energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-861-002).

NOTE: Make sure that the aircraft electrical circuits are energized only for the test that follows. As soon as the test is completed, you must immediately de-energize the aircraft electrical circuits.

(3) On the panel 40VU:
(a) If fuel is used in the opposite wing tank:

push in the XFEED pushbutton switch (P/BSW) and make sure that the XFEED P/BSW OPEN and ON lights come on
push in the TK PUMP P/BSW for the tank that contains the fuel and make sure that the applicable P/BSW OFF light goes off.

(b) If fuel is used from the center tank:

push in the TK PUMP P/BSW for the center tank pump and make sure that the applicable P/BSW OFF light goes off.

NOTE: You must operate the center tank pump on the same side as the air release valve to be tested.

Subtask 28-21-41-860-052-B ** ON A/C NOT FOR ALL

C. Preparation For Test
(1) Make sure that the opposite fuel tank (to that in which you installed the LP air release valve (1)) contains sufficient fuel for the test. If necessary, refuel the opposite fuel tank (Ref. AMM TASK 12-11-28-650-004).
(2) Energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-861-002).

(3) On the panel 40VU:

push in the XFEED pushbutton switch (P/BSW) and make sure that the XFEED P/BSW OPEN and ON lights come on
push in the TK PUMP P/BSW for the tank that contains the fuel and make sure that the applicable P/BSW OFF light goes off.

Subtask 28-21-41-790-050-A

D. Leak Test
(1) Examine the LP air release valve (1) for fuel leaks.

NOTE: A leak rate of up to 5 cc/min. is permitted from the LP air release valve (1) during this test.

NOTE: While air is being bled from the valve (1), the leak rate may be more than the permitted rate. Do not measure the leak rate from the valve (1) until all the air has been bled from the fuel system.

(2) If the leak rate is more than 5 cc/min, the LP air release valve (1) must be replaced.

5. Close-up
Subtask 28-21-41-860-053-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) In the cockpit, on fuel panel 40VU:
(a) If you use fuel from the center tank:
1 Release (out) the applicable TK PUMPS pushbutton switch.
2 Make sure that the applicable OFF light comes on.
(b) If you use fuel in the opposite wing tank:
1 Release (out) the applicable TK PUMPS pushbutton switch.
2 Make sure that the applicable OFF light comes on.

CAUTION: BEFORE YOU CLOSE THE CROSSFEED VALVE, MAKE SURE THAT THE FUEL PUMP(S) IS(ARE) OFF. THIS WILL PREVENT DAMAGE TO THE CROSSFEED VALVE.

3 Release (out) the XFEED pushbutton switch.
4 Make sure that the OPEN and ON lights go off.
(2) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).
(3) Remove the CONTAINER 5 L (1.32 USGAL).

Subtask 28-21-41-860-053-B ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) In the cockpit, on fuel panel 40VU:
(a) Release (out) the applicable TK PUMPS pushbutton switch.
(b) Make sure that the applicable OFF light comes on.

CAUTION: BEFORE YOU CLOSE THE CROSSFEED VALVE, MAKE SURE THAT THE FUEL PUMP(S) IS(ARE) OFF. THIS WILL PREVENT DAMAGE TO THE CROSSFEED VALVE.

(c) Release (out) the XFEED pushbutton switch.
(d) Make sure that the OPEN and ON lights go off.
(2) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).
(3) Remove the CONTAINER 5 L (1.32 USGAL).

Subtask 28-21-41-410-050-A

B. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Install the wing access panel (Ref. AMM TASK 57-27-11-400-001):
(a) FOR [86QM] (VALVE-AIR RELEASE, L WING TK)
install 540CB
(b) FOR [87QM] (VALVE-AIR RELEASE, R WING TK)
install 640CB.

Subtask 28-21-41-650-052-A

C. 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 28-21-41-942-051-A

D. Removal of Equipment
(1) Remove the safety barriers.
(2) Remove the WARNING NOTICE(S).
(3) Remove the access platform(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 07:02:45 UTC