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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
28-21-00-000
THIS PAGE IS INTENTIONALLY LEFT BLANK
PRESSURE FUELING SYSTEM - INTRODUCTION
28-21-00
Page 4
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
General
All tanks fill from the fueling station at the right wing. The fueling
station has these components:
* Fueling panel
* Fueling manifold
* Fueling receptacle
* Fueling shutoff valves (3).
Control
The fueling station permits automatic and manual control of the
fueling shutoff valves. The fueling station receives 28v dc hot
battery bus power through the refueling power control relay.
The relay energizes when you open the door of the fueling
station. Power from the relay comes from one of these sources:
* Battery bus
* DC bus 1
* Bus power control unit (BPCU) internal transformer rectifier.
You use the fueling indication test switch to supply an
alternative ground for the refueling power control relay.
You can refuel the airplane with any one of these electrical
power sources:
* External power on electrical system buses
* External power connected to the airplane, but not on
electrical system buses
* APU generator
* Battery power (battery switch must be on).
GUN 001-099, 101-115
The solenoid for a fueling shutoff valve energizes when you put
the control switch to the OPEN position. The valve opens if fuel
pressure is available. A float switch removes power to the
fueling shutoff valve when the tank is full. You also remove
power when you put the control switch to the CLOSE position.
Without electrical power, the valve closes.
GUN 201-999
You use the preselect switch of the indicator to select the total
amount of fuel you want to put into the tank. The solenoid for a
fueling shutoff valve energizes when you put the control switch
to the OPEN position. The valve then opens if fuel pressure is
available. The indicator removes power to the fueling shutoff
valve when the fuel gets to the selected quantity. You also
remove power when you put the control switch to close. Without
electrical power, the valve closes.
GUN ALL
There is also a manual override plunger on each fueling shutoff
valve. The plunger and fuel pressure let you open the valve if
the solenoid fails.
PRESSURE FUELING SYSTEM - GENERAL DESCRIPTION
EFFECTIVITY
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D633A101-GUN Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
28-21-00-001
Indication
Three valve position lights show that there is power to the
fueling shutoff valves. The light does not show that the valve is
open. These lights are press-to-test. Three fueling indicators
show fuel quantity in each tank.
PRESSURE FUELING SYSTEM - GENERAL DESCRIPTION
EFFECTIVITY
GUN ALL 28-21-00
Page 6
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
28-21-00-001
PRESSURE FUELING SYSTEM - GENERAL DESCRIPTION
PRESSURE FUELING SYSTEM - GENERAL DESCRIPTION
EFFECTIVITY
GUN 001-099, 101-115 28-21-00
Page 7
D633A101-GUN Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
28-21-00-001
PRESSURE FUELING SYSTEM - GENERAL DESCRIPTION
PRESSURE FUELING SYSTEM - GENERAL DESCRIPTION
EFFECTIVITY
GUN 201-999 28-21-00
Page 8
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
28-21-00-001
THIS PAGE IS INTENTIONALLY LEFT BLANK
PRESSURE FUELING SYSTEM - GENERAL DESCRIPTION
28-21-00
Page 9
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 pressure fueling system components are at the fueling
station:
* Fueling receptacle
* Fueling manifold body
* Fueling check valve
* Fueling body/elbow assembly
* Fueling shutoff valve
* Refueling power control relay
* Fueling panel.
A fueling float switch is in each tank.
PRESSURE FUELING SYSTEM - COMPONENT LOCATION
EFFECTIVITY
GUN ALL 28-21-00
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D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
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