Operational Check of the Pylon Check Valve to Make Sure that the Valve is not Failed Open

TASK 28-16-00-710-003-A
Operational Check of the Pylon Check Valve to Make Sure that the Valve is not Failed Open

WARNING: OBEY THE FUEL SAFETY PROCEDURES.

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.

WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE PARTS AFTER THE ENGINE SHUTDOWN. USE APPLICABLE THERMAL GLOVES. THE ENGINE PARTS CAN STAY HOT FOR ONE HOUR AFTER SHUTDOWN AND CAN BURN YOU.

ZONE: 450
ZONE: 460

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	CAP - BLANKING
No specific	1	CONTAINER 20L (5 USGAL)
No specific	AR	COVER - PROTECTION
No specific	1	PLIERS - JAWED, SOFT
No specific	AR	SAFETY BARRIER(S)
No specific	AR	WARNING NOTICE(S)

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 28-16-00-790-002-A	Leak Test of the Fuel Recirculation Cooling-System
TASK 28-25-00-869-001-A	Fuel Transfer
TASK 71-13-00-010-802-A	Opening of the Fan Cowl Doors
TASK 71-13-00-410-802-A	Closing of the Fan Cowl Doors
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)
Fuel Return-Valve (FRV) Connections

3. Job Set-up
Subtask 28-16-00-941-063-B ** ON A/C NOT FOR ALL

A. Safety Precautions
(1) You must obey the fuel safety procedures (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) In the cockpit (zone 210), on panel 115VU:
(a) Put a WARNING NOTICE(S) in position to tell persons not to start the engine.
(4) On the throttle control lever, put the WARNING NOTICE(S) in position to tell persons not to operate the reverse system.

Subtask 28-16-00-650-055-A ** ON A/C NOT FOR ALL

B. Fuel Configuration
(1) Make sure that the applicable wing tank has a minimum of 1600 kg (3527.40 lb) of fuel.
(a) Refuel or transfer fuel as necessary (Ref. AMM TASK 12-11-28-650-004) or (Ref. AMM TASK 28-25-00-869-001).

Subtask 28-16-00-010-060-A ** ON A/C NOT FOR ALL

C. Get Access
(1) Open the applicable 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 procedure of the applicable 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 28-16-00-080-053-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 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.

D. Disconnection of the Fuel Tube from the Valve

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

(1) Put a CONTAINER 20L (5 USGAL) below the valve (1).
(2) Disconnect WC11 harness from the valve (1) with a PLIERS - JAWED, SOFT.
(3) Disconnect the fuel tube from the valve (1).
(4) Let the fuel drain from the fuel tube. 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).

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

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

4. Procedure
Subtask 28-16-00-790-059-A ** ON A/C NOT FOR ALL

A. Operational Check of the Fuel Recirculation Check-Valve to Make Sure that the Valve Has Not Failed Open

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

(1) Monitor the fuel tube for 10 minutes.

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

(2) If there is fuel leakage from the fuel tube, replace the fuel recirculation check-valve (Ref. AMM TASK 28-16-42-000-001) and (Ref. AMM TASK 28-16-42-400-001).

Subtask 28-16-00-480-053-A ** ON A/C NOT FOR ALL

B. Connection of the Fuel Tube to the Valve
(1) Connect the fuel tube and WC11 harness to the valve (1) and do the related test procedure(s) (Ref. AMM TASK 73-13-03-400-801).

Subtask 28-16-00-790-060-A ** ON A/C NOT FOR ALL

C. Leak Test
(1) Do a leak test of the fuel recirculation cooling-system (Ref. AMM TASK 28-16-00-790-002).

5. Close-up
Subtask 28-16-00-410-059-A ** 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 procedure 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 28-16-00-942-058-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 06:17:16 UTC