(4)
 On the throttle control lever, put a warning notice to tell persons not to activate the reverse system.

 Subtask 28-16-00-650-053
 B. Fuel Configuration
 (1) Make sure that the applicable wing tank has a minimum of 800 kg (1763.6976 lb) of fuel (with the outer fuel cell at high level). Refuel or transfer fuel as necessary (Ref. TASK 12-11-28-650-003) or (Ref. TASK 28-25-00-869-001).
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 Details of the Fuel-Return Valve (FRV) Connections Figure 501/TASK 28-16-00-991-004-A
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 C. Get Access
 (1) Open the fan cowl doors (Ref. TASK 71-13-00-010-040). Subtask 28-16-00-860-050-A
 D. Preparation for Check CAUTION : INSTALL CAPS AND PLUGS ON THE ORIFICES OF ALL DISCONNECTED
_______ PIPES AND PARTS FOR THEIR PROTECTION AGAINST CONTAMINATION BY UNWANTED MATERIALS.
 CAUTION : USE 2 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 WILL PREVENT DAMAGE TO THE HARDWARE.
 (Ref. Fig. 501/TASK 28-16-00-991-004-A)
 (1)
 Put a container 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 blanking cap on the open end of the fuel return valve (8).
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 4. Procedure_________
 (Ref. Fig. 501/TASK 28-16-00-991-004-A)
 Subtask 28-16-00-790-054-A
 A. Operational Check of the Pylon Check Valve to Ensure Valve Has Not Failed Open (Ref. Fig. 501/TASK 28-16-00-991-004-A)
 (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. TASK 28-16-42-000-001).
 (b) Install a new fuel recirculation check-valve (Ref. TASK 28-16-42-400-001).
 Subtask 28-16-00-860-051-A
 B. Aircraft Maintenance Configuration
 CAUTION : USE 2 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 WILL PREVENT DAMAGE TO THE HARDWARE.
 (Ref. Fig. 501/TASK 28-16-00-991-004-A) 
R R  (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). 
R R  (3) TORQUE the nut (7) of the fuel return tube (4) to between 1000 and 1050 lbf.in (11.30 and 11.86 m.daN).
 (4) TORQUE the screws (6) to between 24 and 36 lbf.in (0.27 and 0.40 m.daN). 

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 C. Leak Test
 (1) Do a leak test of the fuel return valve (Ref. TASK 73-11-50-360-002).
 5. Close-up
________ Subtask 28-16-00-410-053-A
 A. Close Access
 (1) Close the fan cowls (Ref. TASK 71-13-00-410-040). Subtask 28-16-00-942-053
 B. Removal of Equipment
 (1)
 Remove the safety barriers.

 (2)
 Remove the container.

 (3)
 Remove the warning notice(s).

 (4)
 Remove the ground support and maintenance equipment, the special and standard tools and all other items.

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__________________________________________________________ REMOVAL/INSTALLATION
____________________
 TASK 28-16-41-000-001
 Removal of the Pressure-Holding Valve 124QM (125QM)
 WARNING : PUT THE SAFETY DEVICES AND THE WARNING NOTICES IN POSITION BEFORE YOU
_______ START A TASK ON OR NEAR:
　
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