-
two refuel spill pipe check valves

 -
two overwing refuel adapters with their overwing refuel caps

 -
two fuel drain valves

 -
two air inlet valves.

 The refuel/defuel control panel is installed in the RH side of the belly
 fairing aft of FR36.
 The refuel/defuel control panel has:

 -
a control panel 800VU

 -
a fuel quantity indicator 6QT

 -
a fuel quantity preselector 5QT.
 Access to the refuel/defuel control panel is through a quick-release door
 192MB. This panel controls the operation of:

 -an automatic or manual pressure refuel

 -a pressure defuel (together with the main pumps (Ref. 28-21-00)).

 1EFF : ALL 1 28-25-00Page 13 1 1 Aug 01/05 1 1 1CES 1

 **ON A/C 301-399,

 -
three refuel valves

 -
three refuel diffusers

 -
a defuel/transfer valve

 -
a refuel/defuel gallery

 -
two overwing refuel adapters with their overwing refuel caps

 -
two fuel drain valves

 -
two air inlet valves.

 The refuel/defuel control panel is installed in the RH side of the belly
 fairing aft of FR36.
 The refuel/defuel control panel has:

 -
a control panel 800VU

 -
a fuel quantity indicator 6QT

 -
a fuel quantity preselector 5QT.
 Access to the refuel/defuel control panel is through a quick-release door
 192MB. This panel controls the operation of:

 -an automatic or manual pressure refuel

 -a pressure defuel (together with the main pumps (Ref. 28-21-00) and the main transfer system (Ref. 28-26-00)).

R **ON A/C 001-049, 052-099, 101-149, 151-199, 201-299, 301-399, 401-499,
 The refuel/defuel coupling 40QM is the interface between the aircraft fuel tanks and the external fuel supply. It is attached to the forward face of the RH wing front spar, between RIB14 and RIB15. The refuel/defuel coupling cap 41QM is installed on the refuel/defuel coupling.
 The backing plate 117QM attaches the refuel/defuel coupling shroud 116QM to the refuel/defuel coupling. The shroud is also attached to the inside face of the wing skin. The shroud makes sure that fuel does not go into the leading edge of the wing.
 **ON A/C 051-051,
 The refuel/defuel couplings 100QM(40QM) are the interfaces between the aircraft fuel tanks and the external fuel supply. A single coupling is attached to the forward face of each wing front spar, between RIB14 and RIB15. The refuel/defuel coupling caps 101QM(41QM) are installed on the refuel/defuel couplings.
 The backing plate 119QM(117QM) attaches the refuel/defuel coupling shroud 118QM(116QM) to the refuel/defuel coupling by the backing plate
 1EFF : ALL 1 28-25-00Page 14 1 1 Aug 01/05 1 1 1CES 1 119QM(117QM). The shroud is also attached to the inside face of the wing skin. The shroud makes sure that fuel does not go into the leading edge of the wing.

 **ON A/C ALL
R  The refuel valves 7QU(8QU) and 10QU are the interfaces between the refuel gallery and the related fuel tank. Each valve is solenoid controlled, but pressure operated. Thus when the solenoid is energized, and a refuel pressure is supplied, the valve opens. The refuel valve has a manual override-button. If the solenoid does not operate correctly, the manual override-button can be used to open the valve. The valve 7QU(8QU) is on the leading edge of the wing in the refuel valve canister 19QM(20QM). The valve
R  is behind the access panel 522JB(622JB). The valve 10QU is installed on the
R  rear spar (FR42) of the center tank in the refuel valve canister (88QM).
 (Ref. Fig. 004)
 The defuel/transfer valve (11QM) is in the center tank, on the rear spar.
 The defuel/transfer valve connects the main fuel pump system (Ref. 28-21-00)
 to the refuel gallery. When open, the valve lets the fuel in the main fuel
 pump system be moved into the refuel gallery. This lets the fuel be:

 -moved from one tank to another
 -delivered to the refuel/defuel coupling for removal from the aircraft. A single motor actuator (11QU) operates the defuel/transfer valve. A V-band clamp (82QM) attaches the actuator to the defuel/transfer valve. A MODE SELECT switch (3QU), on the refuel/defuel control panel (800VU), controls the operation of the defuel/transfer valve (11QM). The actuator (11QU) will open the defuel/transfer valve (11QM) when the switch (3QU) is moved to the DEFUEL XFR position. When the defuel/transfer valve is open, an OPEN light (21QU), adjacent to the switch (3QU) will come on. The actuator will close the defuel/transfer valve when the switch (3QU) is in the OFF or the REFUEL positions.
　
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