-
the MODE SELECT switch is set to OFF,

 -
the OPEN warning light is off.

 (2)
 Make sure that the warning notices is in position on the refuel/defuel control panel 800VU to tell persons not to operate the refuel/defuel system.

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

 (4)
 Make sure that the access door 192MB is open.

 (5)
 Make sure that the access platform is in position at the MLG door.

 Subtask 28-25-53-865-051
 B. 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. 401/TASK 28-25-53-991-001)
 Subtask 28-25-53-210-051
 A. Preparation for Installation
 (1) Clean the component interface and/or the adjacent area.
 (2) Do an inspection of the component interface and/or the adjacent area.
 (3) Remove the blanking caps from the mounting flange (1) and from the defuel/transfer valve-actuator (5).
R  (4) Make sure that the defuel/transfer valve actuator (5) is in this configuration: - the see-feel indicator (4) is in-line with the step (valve open). 
R R  NOTE : The drive key (7) and the indicator groove (8) of the drive____ spindle are 90 deg. inverted to the see-feel indicator (4). 
R
 Subtask 28-25-53-420-053
 B. Installation of the Defuel/Transfer Valve-Actuator (11QU)
 (1) Put a new 0-ring (2) with a thin layer of COMMON GREASE (Material No. 04-563) on the mounting flange (1).
 (2) Make sure that the defuel/transfer valve actuator (5) and the drive spindle (8) stay in the correct configuration.
 (3) Connect the drive key (7) into the drive spindle (8).
 (4) Turn the defuel/transfer valve actuator (5) clockwise until the dowel in the flange of the actuator engages with the slot on the mounting flange (1).
 (5) Install the V-clamp (3).
 (6) TORQUE the screw
 CAUTION : DO NOT TORQUE THE V-CLAMP(S) TO MORE THAN THE SPECIFIED_______ VALUE. YOU CAN DAMAGE THE FLANGE SURFACES IF YOU DO.

 -TORQUE the screw to 0.13 m.daN (11.50 lbf.in).
 (7)
 Remove the blanking caps from the electrical connectors.

 (8)
 Make sure that the electrical connectors are clean and in the correct condition.

 (9)
 Connect the electrical connector (6) to the defuel/transfer valve actuator (5).

 Subtask 28-25-53-860-051
 C. Aircraft Maintenance Configuration
 (1) Energize the aircraft electrical circuits
 (Ref. TASK 24-41-00-861-002).

 Subtask 28-25-53-865-053
 D. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s): 1QU, 2QU.
 Subtask 28-25-53-710-051
 E. Test.
 -------------------------------------------------------------------------------ACTION RESULT -------------------------------------------------------------------------------
1. On the refuel/defuel control  On the refuel/defuel control panel panel 800VU: 800VU:
 -set the guarded switch MODE  - the annunciator OPEN 21QU comes on SELECT 3QU to the DEFUEL XFR when the transfer/defuel valve is position. open.
 2. On the refuel/defuel control  On the refuel/defuel control panel panel 800VU: 800VU:
 -set the switch MODE SELECT 3QU - the annunciator OPEN 21QU goes off
 to the OFF position.  when the transfer/defuel valve is closed.
 1EFF : ALL 1 28-25-53Page 407 1 1 Feb 01/98 1 1 1CES 1

 5. Close-up
________ Subtask 28-25-53-410-054
 A. Close Access
 (1)
 Make sure that the work area is clean and clear of tool(s) and other items.

 (2)
 Close the access door 192MB.

 (3)
 Close the MLG doors (Ref. TASK 32-12-00-410-001).

 (4)
 Remove the access platform(s).

 (5) Remove the warning notice(s). Subtask 28-25-53-860-050
 B. De-energize the aircraft electrical circuits
　
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