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open light is on bright. When the fuel crossfeed valve is open,
the crossfeed valve open light is on dim.
ENGINE FUEL FEED - FUNCTIONAL DESCRIPTION - FUEL CROSSFEED VALVE
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
28-22-00-009
ENGINE FUEL FEED - FUNCTIONAL DESCRIPTION - FUEL CROSSFEED VALVE
ENGINE FUEL FEED - FUNCTIONAL DESCRIPTION - FUEL CROSSFEED VALVE
EFFECTIVITY
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D633A101-GUN Jun 10/2004
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
28-22-00-009
General
The fuel spar valve controls fuel flow from the engine fuel feed
manifold to the engine fuel supply line.
Location
The left fuel spar valve is on the left wing front spar outboard of
the engine strut. Access is through an access panel on the left
wing leading edge.
The right fuel spar valve is on the right wing front spar outboard
of the engine strut. Access is through an access panel on the
right wing leading edge.
Motor Actuated Valve
The motor actuated valve has these parts:
* Valve body
* Adapter and shaft
* Actuator.
Valve Body
The valve body connects between the engine fuel feed manifold
and the engine fuel supply line. The valve body has a shaft and
a butterfly valve (not shown). The alignment marks show valve
position.
Adapter and Shaft
The adapter and shaft attaches between the front spar and the
operating shaft. The adapter has a mount plate and an actuator
adapter plate.
The mount plate attaches to the front spar.The actuator adapter
plate attaches to the mount plate with adjustment screws. You
loosen the adjustment screws to rotate the actuator adapter
plate. You turn the actuator adapter plate to align the butterfly
valve with the actuator.
Actuator
The actuator is a 28v dc motor. It has a manual override lever
that permits valve operation without electrical power. The lever
aligns with valve position indicators on the adapter. This shows
valve position.
The fuel spar valve actuator is interchangeable with the
crossfeed valve actuator.
ENGINE FUEL FEED - ENGINE FUEL SPAR VALVE
EFFECTIVITY
GUN ALL 28-22-00
Page 26
D633A101-GUN Jun 10/2004
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
28-22-00-010
ENGINE FUEL FEED - ENGINE FUEL SPAR VALVE
ENGINE FUEL FEED - ENGINE FUEL SPAR VALVE
EFFECTIVITY
GUN ALL 28-22-00
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D633A101-GUN Jun 10/2004
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
28-22-00-010
General
The operation of the left engine fuel spar valve is shown. The
operation of the right engine fuel spar valve is almost the same.
The engine start lever controls the engine fuel spar valve. When
you move the lever to the idle or cut-off position, 28v dc power
goes through a switch assembly to the actuator. The actuator
then moves the engine fuel spar valve to the correct position.
When the fuel spar valve is closed, the fuel valve closed light is
on dim. When the fuel spar valve position and engine start lever
switch position disagree, the fuel spar valve closed light is on
bright. When the fuel spar valve is open, the fuel spar valve
closed light is off.
The fuel shutoff valve battery makes sure that the fuel system
always has power to close the engine fuel spar valve.
ENGINE FUEL FEED - ENGINE FUEL SPAR VALVE OPERATION
EFFECTIVITY
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Page 28
D633A101-GUN Jun 10/2004
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
28-22-00-011
ENGINE FUEL FEED - ENGINE FUEL SPAR VALVE OPERATION
ENGINE FUEL FEED - ENGINE FUEL SPAR VALVE OPERATION
EFFECTIVITY
GUN ALL 28-22-00
Page 29
D633A101-GUN Jun 10/2004
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
28-22-00-011
Purpose
The fuel shutoff valve battery makes sure that the fuel system
always has power to close these shutoff valves:
* Engine fuel shutoff valve
* APU fuel shutoff valve.
Components
The fuel shutoff valve battery and charger has these
components:
* Aluminum case
* Battery assembly
　
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