(2)
 Make sure that the remaining fuel has been drained from the applicable fuel tank (Ref. TASK 28-25-00-650-003).

 (3)
 Make sure that the main landing gear doors are open (Ref. TASK 32-12-00-010-001) .

 (4)
 Make sure that the GROUND LOCK SLEEVE (460005835) is on the applicable main gear door actuator.

 (5)
 Make sure that the center tank access panel 148AZ is removed (Ref. TASK 28-10-00-910-002), (Ref. TASK 57-17-11-000-001).

 (6)
 Make sure that the refuel valve has been removed (Ref. TASK 28-25-51-000-002).

 Subtask 28-25-52-865-052
 C. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged
 -------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------121VU FUEL/RFL/DFL/SPLY 2QU L24 121VU FUEL/RFL/DFL/XFR/DEFUEL/VALVE 1QU L23
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 4. Procedure_________
 (Ref. Fig. 402/TASK 28-25-52-991-002)
 Subtask 28-25-52-420-055
 A. Preparation for Installation
 WARNING : USE SOLVENTS/CLEANING AGENTS, SEALANTS AND OTHER SPECIAL_______ MATERIALS ONLY WITH A GOOD SUPPLY OF AIR. OBEY THE MANUFACTURERS INSTRUCTIONS. PUT ON PROTECTIVE CLOTHING. DO NOT GET THEM IN YOUR MOUTH. DO NOT SMOKE. DO NOT BREATHE THE GAS. THESE MATERIALS ARE POISONOUS, FLAMMABLE AND SKIN IRRITANT. GET MEDICAL HELP IF YOUR SKIN OR EYES BECOME IRRITATED.
R R  (1) Clean the component interface and/or the adjacent area with a MISCELLANEOUS (Material No. 19-003) made moist with CLEANING AGENTS (Material No. 11-026).
 (2) Lubricate the new O-ring (14) and the new O-ring (3) with FUELS (Material No. 01-001) or COMMON GREASE (Material No. 04-012).
 (3) Lubricate the new O-ring (9) with FUELS (Material No. 01-001) or COMMON GREASE (Material No. 04-012).
 (4) Install the O-ring (14) in the groove on the face of the refuel valve canister (13).
 Subtask 28-25-52-420-052 
R  B. Installation of the Refuel Valve Canister 88QM
 (1) Install the refuel valve canister (13) in position.
 (2) Install the spacer (16) and attach with the screws (15).
 (3) Remove the blanking plugs from the disconnected line ends. 
R  (4) Install the O-ring (3) in the groove in the adapter (17). Connect the elbow (17) to the refuel valve canister (13) with the bolts (1) and washers (2).

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R (5) Install the O-ring (9) in the groove in the elbow (10). Connect the elbow (10) to the refuel valve canister (13) with the bolts (11) and washers (12).
 (6) Use the screw (7), the washer (6) and the nut (5) to attach the bonding straps (4) and (8) to the refuel valve canister (13) (Ref. TASK 20-28-00-912-002).
 Subtask 28-25-52-410-051
 C. Close Access
 (1)
 Make sure that the work area is clean and clear of tool(s) and other items.

 (2)
 Install the center tank access panel 148AZ (Ref. TASK 57-17-11-400-001).

 (3) Install the refuel valve (Ref. TASK 28-25-51-400-002).
 Subtask 28-25-52-650-053

 D. Fuel Configuration
 (1) Refuel, defuel or transfer fuel as necessary (Ref. TASK 12-11-28-650-003), (Ref. TASK 28-25-00-650-001) or (Ref. TASK 28-25-00-869-001).
 Subtask 28-25-52-790-051
 E. Test
 (1) Make sure there are no leaks at the interface of the refuel valve canister (13) with the structure.
 5. Close-up
________
 Subtask 28-25-52-410-052

 A. Close Access
 (1)
 Make sure that the work area is clean and clear of tool(s) and other items.

 (2)
 Remove the access platform(s).

 (3)
 Close the main landing gear doors (Ref. TASK 32-12-00-410-001).

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 B. Removal of Equipment
 (1)
 Remove the safety barriers.

 (2)
 Remove the warning notice(s).

 (3)
 Remove the ground support and maintenance equipment, the special and standard tools and all other items.

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 ACTUATOR - DEFUEL/TRANSFER VALVE (11QU) - REMOVAL/INSTALLATION
______________________________________________________________
 TASK 28-25-53-000-001
 Removal of the Center-Tank Defuel/Transfer Valve-Actuator (11QU)

 1.
 Reason for the Job

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