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PRESSURE FUELING SYSTEM - P15 FUELING PANEL
28-21-00
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D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
General
These components are in the fueling manifold assembly:
* Fueling receptacle
* Fueling manifold body
* Fueling valves
* Fueling check valves
* Defuel port.
Fueling Receptacle
The fueling receptacle supplies a connection for the fueling
hose.
Fueling Manifold Body
The fueling manifold body supplies fuel from the fueling
receptacle to the fueling shutoff valves.
Fueling Valves
The fueling valves control fuel flow to the fuel tanks. A solenoid
controls the valve while fuel pressure operates the valve. A
manual override plunger on each valve permits manual
operation.
Fueling Check Valve
The fueling check valves permit fueling receptacle manifold
replacement without the removal of fuel from each tank.
Defuel Port
The defuel port lets you to bring fuel from each tank to the
fueling manifold for fuel transfer or defueling operation.
PRESSURE FUELING SYSTEM - FUELING MANIFOLD
EFFECTIVITY
GUN ALL 28-21-00
Page 18
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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PRESSURE FUELING SYSTEM - FUELING MANIFOLD
PRESSURE FUELING SYSTEM - FUELING MANIFOLD
EFFECTIVITY
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Page 19
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
28-21-00-004
General
The fueling float switches prevent over-fueling the fuel tanks.
The fueling float switches remove power to the fueling valves
when the fuel level in the tank is full.
The fueling float switches have a float that is in a cylindrical
container. When the tank is less than full, the float switch lets
power go to the fueling valve solenoid. When the tank gets full,
the fueling float switch removes power to the fueling valve
solenoid.
Training Information Point
The conduit contains a polymer protective liner material to
eliminate wire damage from chafing.
PRESSURE FUELING SYSTEM - FUELING FLOAT SWITCHES
EFFECTIVITY
GUN ALL 28-21-00
Page 20
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
28-21-00-005
PRESSURE FUELING SYSTEM - FUELING FLOAT SWITCHES
PRESSURE FUELING SYSTEM - FUELING FLOAT SWITCHES
EFFECTIVITY
GUN ALL 28-21-00
Page 21
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
28-21-00-005
General
Power for the pressure fueling system comes from the 28v dc
hot battery bus. When the fueling station receives power, the
outboard fueling panel flood light and the outboard fueling
nozzle flood light come on. The fueling indicators also receive
power.
Hot Battery Bus
When the fueling panel door opens, the refueling power control
relay energizes. This sends hot battery bus power to the fueling
panel.
Fueling Valve Open Control
The fueling valves open when all of these conditions are true:
* There is power to the fueling panel
* Fueling valve control switch is in the OPEN position
* Fueling float switch is in the not full position
* The fueling valve solenoid energizes
* Fuel pressure is at the fueling valve.
Fueling Valve Open Light - On
The fueling valve open light comes on when there is power to
the fueling valve solenoid. The light does not show that the
fueling valve is open. The solenoid must have power and the
valve must have fuel pressure to open.
Fueling Valve Closed Control
The fueling valves close when any of these conditions are true:
* Fueling panel does not have power
* Fueling valve control switch is in the CLOSED position
GUN 201-999
* Quantity of fuel in the fuel tank equals the preselect fuel
quantity
GUN ALL
* Fueling float switch is in the full position
* No fuel pressure is at the fueling valve.
Fueling Valve Open Light - Off
The fueling valve open light goes off when there is no power to
the fueling valve solenoid.
Fuel Indication Test Switch
When the switch is in the FUEL DOOR SW BYPASS position, the
　
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