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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
General
The defuel system removes fuel from the fuel tanks to the refuel
station. The defuel system also permits fuel transfer from one
fuel tank to another.
DEFUEL - INTRODUCTION
EFFECTIVITY
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DEFUEL - INTRODUCTION
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
General
The defuel system permits pressure defuel of each tank and
suction defuel of main tank 1 and main tank 2.
The defuel system also allows fuel transfer on the ground from
one fuel tank to another.
Pressure Defuel
You use these to pressure defuel the tanks:
* Refuel station
* Fuel pumps
* Defuel valve
* Crossfeed valve.
Suction Defuel
You use the defuel valve and refuel station to suction defuel
main tank 1 and main tank 2.
Fuel Transfer
You use the defuel valve, the refuel station, and the fuel control
panel to transfer fuel between tanks.
DEFUEL - GENERAL DESCRIPTION
EFFECTIVITY
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DEFUEL - GENERAL DESCRIPTION
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EFFECTIVITY
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Location
The defuel valve is located on the right wing front spar. The
defuel valve connects between the right engine fuel feed
manifold and refuel station tubing.
DEFUEL - COMPONENT LOCATION
EFFECTIVITY
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DEFUEL - COMPONENT LOCATION
DEFUEL - COMPONENT LOCATION
EFFECTIVITY
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Purpose
The defuel valve connects the right engine fuel feed manifold
with the defuel manifold. This permits removal of fuel from the
fuel tanks.
Description
The defuel valve operates manually. It has these components:
* Handle
* Valve assembly.
Handle
The handle operates the defuel valve. The handle is also a
position indicator. You cannot close the defuel valve access
door with the handle in the open position.
Valve Assembly
The valve assembly attaches to structure inside the fuel tank. It
connects to both the defuel manifold and the right engine fuel
feed manifold.
DEFUEL - DEFUEL VALVE
EFFECTIVITY
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DEFUEL - DEFUEL VALVE
DEFUEL - DEFUEL VALVE
EFFECTIVITY
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General
There are two ways to defuel the fuel tanks, pressure defuel and
suction defuel. You can pressure defuel any tank. You can only
suction defuel main tank 1 and main tank 2. You can transfer
fuel between any tank.
Suction defuel of main tank 1 will occur only if main tank 2 is
suction defueled at the same time. When main tank 2 empties,
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