Operational Check of Pylon Check Valve to Ensure Valve not Failed Open

TASK 28-16-00-710-002-A
Operational Check of Pylon Check Valve to Ensure Valve not Failed Open

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

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.

ZONE: 450
ZONE: 460
FIN: 122QM ** ON A/C NOT FOR ALL
FIN: 123QM ** ON A/C NOT FOR ALL

1. Reason for the Job
Refer to the MPD TASK: 281600-01
OPERATIONAL CHECK OF PYLON CHECK VALVE TO ENSURE VALVE NOT FAILED OPEN
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	CAP - BLANKING
No specific	1	CONTAINER 20L (5 USGAL)
No specific	AR	CONTAINER 3 L(3/4 USGAL)
No specific	AR	COVER - PROTECTION
No specific	1	PLIERS - JAWED, SOFT
No specific	AR	SAFETY BARRIER(S)
No specific	AR	WARNING NOTICE(S)
No specific	Torque wrench: range to between 36 and 24 lbf.in (0.41 and 0.27 m.daN )
No specific	Torque wrench: range to between 472.70 and 428.40 lbf.in (5.34 and 4.84 m.daN )
No specific	Torque wrench: range to between 1050 and 1000 lbf.in (11.87 and 11.30 m.daN )

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
450	ENG 1 THRUST REVERSER & EXHAUST SECTION
460	ENG 2 THRUST REVERSER & EXHAUST SECTION

C. Referenced Information

REFERENCE	DESIGNATION
TASK 12-11-28-650-004-A	Pressure Refuel with Manual Control
TASK 28-00-00-910-001-A	Fuel Safety Procedures
TASK 28-25-00-869-001-A	Fuel Transfer
TASK 71-00-00-720-811-A	Test No. 3A - Idle Power Test
TASK 71-13-00-010-040-A	Opening of the Fan Cowl Doors
TASK 71-13-00-010-040-B	Opening of the Fan Cowl Doors
TASK 71-13-00-010-802-A	Opening of the Fan Cowl Doors
TASK 71-13-00-410-040-A	Closing of the Fan Cowl Doors
TASK 71-13-00-410-040-B	Closing of the Fan Cowl Doors
TASK 71-13-00-410-802-A	Closing of the Fan Cowl Doors
TASK 73-11-50-360-001-A-01	Leak check of the Fuel Return Valve.
TASK 73-11-50-360-002-A	Leak Check and Functional Test of the Fuel Return Valve
TASK 73-13-03-400-801-A	Installation of the Fuel Return To Tank (RTT) Valve
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
TASK 78-36-00-010-802-A	Opening of the Thrust Reverser Cowl-Doors
TASK 78-36-00-410-802-A	Closing of the Thrust Reverser Cowl-Doors
TASK 28-16-42-000-001-A	Removal of the Fuel Recirculation Check-valve (for corrective action)
TASK 28-16-42-400-001-A	Installation of the Fuel Recirculation Check-valve (for corrective action)
Details of the Fuel-Return Valve (FRV) Connections ** ON A/C NOT FOR ALL
Details of the Fuel-Return Valve (FRV) Connections ** ON A/C NOT FOR ALL
Details of the Fuel Return To Tank Valve (RTT) Connections ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 28-16-00-941-054-A ** ON A/C NOT FOR ALL

A. Safety Precautions

WARNING: OBEY THE FUEL SAFETY PROCEDURES.

(1) You must obey the fuel safety procedures when you work on the fuel system (Ref. AMM TASK 28-00-00-910-001).
(2) As necessary, use the applicable SAFETY BARRIERS, specified by the operator's instructions and your local regulations.
(3) On the panel 115VU, put a WARNING NOTICE(S) to tell persons not to start the engine.
(4) On the throttle control lever, put a WARNING NOTICE(S) to tell persons not to activate the reverse system.

Subtask 28-16-00-650-053-A ** ON A/C NOT FOR ALL

B. Fuel Configuration
(1) Make sure that the applicable wing tank has a minimum of 1600 kg (3527.4 lb) of fuel (with atleast 500 kg (1102.3 lb) in the outer fuel cell). Refuel or transfer fuel as necessary (Ref. AMM TASK 12-11-28-650-004) or (Ref. AMM TASK 28-25-00-869-001).

Subtask 28-16-00-010-052-A ** ON A/C NOT FOR ALL

C. Get Access
(1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-040).

Subtask 28-16-00-860-050-A ** ON A/C NOT FOR ALL

CAUTION: INSTALL CAPS AND PLUGS ON THE ORIFICES OF ALL DISCONNECTED PIPES AND PARTS FOR THEIR PROTECTION AGAINST CONTAMINATION BY UNWANTED MATERIALS.

CAUTION: USE TWO WRENCHES TO REMOVE OR INSTALL THE TUBE COUPLING NUTS:

ONE WRENCH TO HOLD THE UNION, AND
ONE TO LOOSEN OR TIGHTEN THE COUPLING NUT.

THIS PREVENTS DAMAGE TO THE PARTS.

D. Preparation For Check

Details of the Fuel-Return Valve (FRV) Connections ** ON A/C NOT FOR ALL

(1) Put a CONTAINER 3 L(3/4 USGAL) below the fuel return tube (2).
(2) Remove the nuts (6), the washers (5), the screws (1) and the clamps (3) from the fuel return tube (2).
(3) Loosen the nut (7) of the fuel return tube (2) to drain the fuel.
(4) When all the fuel has drained from the fuel return tube (2), disconnect it from the fuel return valve (8).

NOTE: You must wait for a period of 10 minutes to let the fuel drain completely.

(5) Put a CAP - BLANKING on the open connection of the fuel return valve (8).

Subtask 28-16-00-010-052-B ** ON A/C NOT FOR ALL

E. Get Access
(1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-040).

Subtask 28-16-00-860-050-B ** ON A/C NOT FOR ALL

CAUTION: INSTALL CAPS AND PLUGS ON THE ORIFICES OF ALL DISCONNECTED PIPES AND PARTS FOR THEIR PROTECTION AGAINST CONTAMINATION BY UNWANTED MATERIALS.

CAUTION: USE TWO WRENCHES TO REMOVE OR INSTALL THE TUBE COUPLING NUTS:

ONE WRENCH TO HOLD THE UNION, AND
ONE TO LOOSEN OR TIGHTEN THE COUPLING NUT.

THIS PREVENTS DAMAGE TO THE PARTS.

F. Preparation for Check

Details of the Fuel-Return Valve (FRV) Connections ** ON A/C NOT FOR ALL

(1) Put a CONTAINER 3 L(3/4 USGAL) below the fuel return tube (4).
(2) Remove the nut (1), the screw (6) and the washer (5). Move the clamp (3) with the fuel return tube (4) away from the bracket (2).
(3) Loosen the nut (7) of the fuel return tube (4) to drain the fuel.
(4) When all the fuel has drained from the fuel return tube (4), disconnect it from the fuel return valve (8).

NOTE: You must wait for a period of 10 minutes to let the fuel drain completely.

(5) Put a CAP - BLANKING on the open end of the fuel return valve (8).

Subtask 28-16-00-010-052-F ** ON A/C NOT FOR ALL

G. Get Access
(1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-802).

WARNING: YOU MUST DEACTIVATE THE THRUST REVERSER BEFORE YOU DO WORK ON OR AROUND IT. IF YOU DO NOT, THE THRUST REVERSER CAN OPERATE ACCIDENTALLY AND CAUSE AN INJURY AND/OR DAMAGE.

(2) Do the deactivation of the thrust reverser system for maintenance (Ref. AMM TASK 78-30-00-040-805).
(3) Open the left thrust-reverser cowl-door (Ref. AMM TASK 78-36-00-010-802).

Subtask 28-16-00-860-050-F ** ON A/C NOT FOR ALL

CAUTION: INSTALL CAPS AND PLUGS ON THE ORIFICES OF ALL DISCONNECTED PIPES AND PARTS FOR THEIR PROTECTION AGAINST CONTAMINATION BY UNWANTED MATERIALS.

CAUTION: USE A SECOND WRENCH TO HOLD THE MATING PARTS WHEN YOU LOOSEN OR TIGHTEN THE TUBE OR HOSE NUTS. IF YOU DO NOT OBEY THIS CAUTION, YOU CAN TWIST OR CAUSE DAMAGE TO THE TUBES OR HOSES.

H. Preparation for Check

Details of the Fuel Return To Tank Valve (RTT) Connections ** ON A/C NOT FOR ALL

(1) Put a CONTAINER 20L (5 USGAL) below the valve (1).
(2) Disconnect the harness (WC11) from the valve (1) with the PLIERS - JAWED, SOFT.
(3) Disconnect the fuel tube from the valve (1).
(4) Let the fuel drain from the fuel tube:
(a) You must wait for a period of 10 minutes to let the fuel drain completely.
(5) Put a CAP - BLANKING on the open end of the valve (1).
(6) Installation of protection covers:

CAUTION: INSTALL PROTECTION COVERS ON ALL THE OPENINGS IMMEDIATELY TO PREVENT DAMAGE TO THE ENGINE.

(a) Make sure that you install COVER - PROTECTION as necessary to prevent damage to the engine.

4. Procedure
Subtask 28-16-00-790-054-A ** ON A/C NOT FOR ALL

A. Operational Check of the Fuel Recirculation Check Valve to Ensure Valve Has Not Failed Open

Details of the Fuel-Return Valve (FRV) Connections ** ON A/C NOT FOR ALL

(1) Monitor the fuel return tube (2) for 10 minutes.

NOTE: A leak rate of 8 drops a minute is permitted.

(2) If there is fuel leakage from the fuel return tube (2):
(a) Remove the fuel recirculation check-valve (Ref. AMM TASK 28-16-42-000-001).
(b) Install a new fuel recirculation check-valve (Ref. AMM TASK 28-16-42-400-001).

Subtask 28-16-00-860-051-A ** ON A/C NOT FOR ALL

CAUTION: USE TWO WRENCHES TO REMOVE OR INSTALL THE TUBE COUPLING NUTS:

ONE WRENCH TO HOLD THE UNION, AND
ONE TO LOOSEN OR TIGHTEN THE COUPLING NUT.

THIS PREVENTS DAMAGE TO THE PARTS.

B. Aircraft Maintenance Configuration

Details of the Fuel-Return Valve (FRV) Connections ** ON A/C NOT FOR ALL

(1) Remove the blanking cap from the fuel return valve (8). Loosely connect the nut (7) of the fuel return tube (2) to the fuel return valve (8).
(2) Install the three clamps (3) on the fuel return tube (2). Loosely attach the clamps to their related brackets (4) with the screws (1), the washers (5) and the nuts (6).
(3) TORQUE the nut (7) of the fuel return tube (2) to between 472.70 and 428.40 lbf.in (5.34 and 4.84 m.daN )

.
(4) TORQUE the screws (1) to between 36 and 24 lbf.in (0.41 and 0.27 m.daN )

Subtask 28-16-00-790-056-A ** ON A/C NOT FOR ALL

C. Leak Test
(1) Do a leak test of the fuel return valve (Ref. AMM TASK 73-11-50-360-001).

Subtask 28-16-00-790-054-B ** ON A/C NOT FOR ALL

D. Operational Check of the Fuel Recirculation Check Valve to Ensure Valve Has Not Failed Open

Details of the Fuel-Return Valve (FRV) Connections ** ON A/C NOT FOR ALL

(1) Monitor the fuel return tube (4) for 10 minutes.

NOTE: A leak rate of 8 drops a minute is permitted.

(2) If there is fuel leakage from the fuel return tube (4):
(a) Remove the fuel recirculation check-valve (Ref. AMM TASK 28-16-42-000-001).
(b) Install a new fuel recirculation check-valve (Ref. AMM TASK 28-16-42-400-001).

Subtask 28-16-00-860-051-B ** ON A/C NOT FOR ALL

CAUTION: USE TWO WRENCHES TO REMOVE OR INSTALL THE TUBE COUPLING NUTS:

ONE WRENCH TO HOLD THE UNION, AND
ONE TO LOOSEN OR TIGHTEN THE COUPLING NUT.

THIS PREVENTS DAMAGE TO THE PARTS.

E. Aircraft Maintenance Configuration

Details of the Fuel-Return Valve (FRV) Connections ** ON A/C NOT FOR ALL

(1) Remove the blanking cap from the fuel return valve (8). Loosely connect the nut (7) of the fuel return tube (4) to the fuel return valve (8).
(2) Install the fuel return tube (4) and the clamp (3) on the bracket (2) with the screw (6), the washer (5) and the nut (1).
(3) TORQUE the nut (7) of the fuel return tube (4) to between 1050 and 1000 lbf.in (11.87 and 11.30 m.daN )

.
(4) TORQUE the screws (6) to between 36 and 24 lbf.in (0.41 and 0.27 m.daN )

Subtask 28-16-00-790-056-B ** ON A/C NOT FOR ALL

F. Leak Test
(1) Do a leak test of the fuel return valve (Ref. AMM TASK 73-11-50-360-002).

Subtask 28-16-00-790-054-F ** ON A/C NOT FOR ALL

G. Operational Check of the Fuel Recirculation Check-Valve to Ensure Valve Has Not Failed Open

Details of the Fuel Return To Tank Valve (RTT) Connections ** ON A/C NOT FOR ALL

(1) Monitor the fuel tube for 10 minutes.

NOTE: A leak rate of 8 drops per minute is permitted.

(2) If there is fuel leakage from the fuel tube:
(a) Remove the fuel recirculation check-valve (Ref. AMM TASK 28-16-42-000-001).
(b) Install a new fuel recirculation check-valve (Ref. AMM TASK 28-16-42-400-001).

Subtask 28-16-00-860-051-F ** ON A/C NOT FOR ALL

H. Aircraft Maintenance Configuration
(1) Connect the fuel tube and the harness (WC11) to the valve (1) and do the related test procedure(s) (Ref. AMM TASK 73-13-03-400-801).

Subtask 28-16-00-790-056-F ** ON A/C NOT FOR ALL

I. Leak Test
(1) Do an idle power test (Ref. AMM TASK 71-00-00-720-811).

5. Close-up
Subtask 28-16-00-410-053-A ** ON A/C NOT FOR ALL

A. Close Access
(1) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-040).

Subtask 28-16-00-410-053-B ** ON A/C NOT FOR ALL

A. Close Access
(1) Close the fan cowls (Ref. AMM TASK 71-13-00-410-040).

Subtask 28-16-00-410-053-F ** ON A/C NOT FOR ALL

A. Close Access
(1) Close the left-thrust reverser cowl-door (Ref. AMM TASK 78-36-00-410-802):
(2) Do the reactivation of the thrust reverser system after maintenance (Ref. AMM TASK 78-30-00-440-805).
(3) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-802).

Subtask 28-16-00-942-053-A ** ON A/C NOT FOR ALL

B. Removal of Equipment
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Remove the SAFETY BARRIERS.
(3) Remove the container.
(4) Remove the WARNING NOTICE(S).
(5) Remove the ground support and maintenance equipment, the special and standard tools and all other items.

[Rev.10 from 2021] 2026.04.02 07:02:19 UTC