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refuel shutoff valve, pilot valve, precheck valve, and associated plumbing
and wiring.
Electrical power to operate the system indicator lights, solenoid valves
and fuel quantity signal conditioner is 28-vdc supplied from the EMER
BATT hot bus through the PWR ON switch on the refuel control panel.
The refuel shutoff valve is controlled by the pilot valve located at the
high point in the fuselage tank. When refueling pressure is applied to
the system through the pressure refueling adapter, pressurized fuel is
applied to the refuel shutoff valve. This pressure is applied to both
sides of the valve poppet. If the pilot valve is open, some of the pressure
acting to hold the valve closed will be vented through the pilot valve
and the pressure acting to unseat the poppet will drive the valve open
against the spring tension. When the tank fills, the pilot valve will close,
fuel pressure on both sides of the refuel shutoff valve poppet will
equalize, and spring tension will drive the valve closed. If the refuel
shutoff valve malfunctions, fuel will vent out of the NACA vent scoop
to prevent overpressurization of the fuselage tank.
Pilot’s Manual
2-38 PM-132A
PRECHECK VALVE
The precheck valve is used to check operation of the system shutoff
valve before full refueling procedures are commenced. When the precheck
valve is set to PRECHECK OPEN and refuel pressure is applied
to the refuel adapter, fuel will be admitted to the precheck line. The
shutoff valve will open and fuel will flow into the fuselage tank. The
fuel in the precheck line will empty into a float basin at the pilot valve.
When the basin fills, the pilot valve float will close the pilot valve,
which causes the shutoff valve to close, terminating fuel flow. Fuel flow
should stop within 20 seconds.
FUEL ADDITIVES
Refer to Airplane Flight Manual Addendum I Fuel Servicing for recommended
concentrations and the proper blending methods of approved
fuel additives.
REFUELING
The aircraft is refueled through a gravity filler cap located on the right
side of the fuselage in front of the engine pylon or through the Single-
Point Pressure Refueling (SPPR) adapter located on the right side of the
fuselage below the engine pylon. A refueling panel access door is located
next to the SPPR adapter access door. Refer to Airplane Flight Manual
Addendum I Fuel Servicing for a list of approved fuels and
refueling procedures.
Pilot’s Manual
PM-132A 2-39
FUEL DRAINS
Figure 2-8
RIGHT DRAIN MAST
RIGHT WING ACCESS DOOR
LEFT DRAIN MAST
RIGHT WING SUMP LEFT WING SUMP
• FUEL VENT/EXPANSION
• FUEL TRANSFER
• ENGINE SUPPLY
• FUEL FILTER
LEFT WING ACCESS DOOR
• FUEL CROSSFLOW
• FUEL VENT/EXPANSION
• FUEL TRANSFER
• ENGINE SUPPLY
• FUEL FILTER
•
•
•
•

　
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