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* Printed circuit board assembly.
Battery Assembly
The battery assembly consists of 22 nickel-cadmium batteries
and a temperature sensor. The batteries are connected in
series to supply 28v dc to the valve actuators.
Printed Circuit Board Assembly
The printed circuit board assembly has a switch circuit and a
charge circuit.
The switch circuit monitors the voltage of the hot battery bus. If
the voltage goes below 22v, the switch circuit supplies power
from the fuel shutoff battery to the valve actuator circuits.
The charge circuit uses power from dc bus 2 to charge the
batteries.
ENGINE FUEL FEED - FUEL SHUTOFF VALVE BATTERY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.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
28-22-00-014
ENGINE FUEL FEED - FUEL SHUTOFF VALVE BATTERY
ENGINE FUEL FEED - FUEL SHUTOFF VALVE BATTERY
EFFECTIVITY
GUN ALL 28-22-00
Page 31
D633A101-GUN Jun 10/2004
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
28-22-00-014
General
The water scavenge ejector pumps remove water from the low
points in each tank to prevent corrosion.
Location
The water scavenge ejector pumps are on the rear spar. There
is one water scavenge ejector pump in main tank No. 1 and one
water scavenge ejector pump in main tank No. 2. Access to the
water scavenge ejector pump for main tank No. 1 is through an
access panel on the bottom of the left wing. Access to the water
scavenge ejector pump in main tank No. 2 is through an access
panel on the bottom of the right wing.
There are two water scavenge ejector pumps in the center tank.
Access to the water scavenge ejector pump in the left side of
the center tank is through the left wheel well. Access to the
water scavenge pump in the right side of the center tank is
through the right wheel well.
Functional Description
The water scavenge ejector pumps operate automatically when
the override pumps and boost pumps are on. The water
scavenge ejector pumps use fuel flow from the override and
boost pumps as motive flow. The motive flow through the water
scavenge ejector pump causes a suction. This suction takes
water and fuel from the low points in each tank. The water and
fuel that comes out of the water scavenge ejector pump goes to
the override and boost pump inlets.
ENGINE FUEL FEED - WATER SCAVENGE EJECTOR PUMP
EFFECTIVITY
GUN ALL 28-22-00
Page 32
D633A101-GUN Jun 10/2004
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
28-22-00-012
ENGINE FUEL FEED - WATER SCAVENGE EJECTOR PUMP
ENGINE FUEL FEED - WATER SCAVENGE EJECTOR PUMP
EFFECTIVITY
GUN ALL 28-22-00
Page 33
D633A101-GUN Jun 10/2004
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
28-22-00-012
Fuel Panel
The fuel panel is on the P5 overhead panel. Switches on the
panel control the boost pumps and the crossfeed valve.
Boost pump LOW PRESSURE lights come on when boost pump
pressure is low.
Center tank boost pump LOW PRESSURE lights come on when
the center tank boost pump switch is in the ON position and
center tank boost pump pressure is low.
FUEL VALVE CLOSED lights come on dim when the engine fuel
spar valve is closed. The FUEL VALVE CLOSED lights come on
bright when there is a disagreement between the switch and
valve position. The FUEL VALVE CLOSED lights are off when
the engine fuel spar valve is open.
The crossfeed VALVE OPEN light comes on dim when the
crossfeed valve is open. The crossfeed VALVE OPEN light
comes on brightly when there is a disagreement between the
switch and valve position. The crossfeed VALVE OPEN light is
off when the crossfeed valve is closed.
Center Tank Engine Fuel Supply
Usually all pump switches are in the ON position at the
beginning of a flight. The center tank supplies fuel to the
engines. When the center tank is empty, you turn the center tank
boost pumps to the OFF position.
Main Tank No. 1 and Main Tank No. 2 Fuel Supply
When the center tank is empty, and the boost pumps are on, fuel
goes from the main tanks to the engines.
Crossfeed Operation
Fuel goes through the crossfeed valve to correct an imbalance
between main tank No. 1 and main tank No. 2.
To correct an imbalance, open the crossfeed valve and turn off
　
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