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FUEL XFLO OPEN (white)
L R STBY PUMP ON (white)
CAS MESSAGES
PRESSURE
REFUELING
ADAPTER
PRECHECK
VALVE
REFUELING
MANIFOLD
FUSELAGE
FUEL TANK
PILOT
VALVE
SURGE
TANK
SURGE
FLOAT
VALVE
MAIN
VENT
SCOOP
AUXILIARY
VACUUM/PRESSURE
RELIEF VALVE
[CLOSED]
FIRE
PUSH
[CLOSED]
FIRE
PUSH
R FUEL
PRESS
LOW
L FUEL
PRESS
LOW
LEFT WING
FUEL TANK
WING FUEL
COLLECTOR
BAYS
RIGHT WING
FUEL TANK
GRAVITY
FILLER
PORT
RIGHT
ENGINE
LEFT
ENGINE
TYPICAL FOR LEFT AND
RIGHT WING TANKS
ELECTRICAL
FUEL
ON ON
L STBY XFLOW R STBY
FUEL FILTER
L R FUEL BAY LOW (white)
2-31/2-32 (Blank)
FUEL SYSTEM SCHEMATIC
Figure 2-6
Pilot’s Manual
PM-132A 2-33
STBY SWITCHES
The L and R STBY switches, within the FUEL group of the aft pedestal,
manually control the operation of the electric standby pumps. These
momentary switches normally remain off. In the event of a main jet
pump failure or during fuel crossflow, the L and R STBY switches must
be manually selected to ON by the flight crew. The standby pumps are
automatically energized during engine start (begins when the L or R
START switch is depressed, and stops at 50% N2). When the standby
pumps are operating, the L and/or R STBY switches will illuminate
ON.
The standby pumps operate on 28-vdc supplied through the 15-amp L
and R STBY PUMP PWR circuit breakers within the FUEL groups of the
pilot’s and copilot’s circuit breaker panels respectively. The automatic
and manual pump controls are powered by 28-vdc through the 3-amp
L and R STBY PUMP CTRL circuit breakers located within the FUEL
groups of the pilot’s and copilot’s circuit breaker panels respectively.
The following CAS illuminations are specific to the standby fuel
pumps:
XFLOW SWITCH AND CROSSFLOW SHUTOFF VALVE
The XFLOW switch, within the FUEL group of the aft pedestal, controls
the crossflow shutoff valve. The valve is normally in the closed position.
Depressing the XFLOW switch illuminates a white bar and power
is applied to open the motorized crossflow shutoff valve allowing fuel
to flow between the wing tanks.
To balance wing fuel, the XFLOW switch should be set to open (white
bar illuminated) and the heavy side L or R STBY switch set to ON. The
standby pump will continue to operate until the L or R STBY switch is
deselected. The crossflow shutoff valve allows all usable fuel aboard
the aircraft to be available to either engine. The switch should not be selected
except when correcting an out-of-balance condition.
The crossflow shutoff valve operates on 28-vdc supplied from the rear
hot bus through the 5-amp XFLOW VALVE CTRL circuit breaker located
within the FUEL group of the copilot’s circuit breaker panel. Loss of
power to the crossflow shutoff valve causes the valve to remain in its
last commanded position.
CAS Color Description
FUEL PRESS LOW Red Fuel pressure is low at the associated (L or
R) engine’s fuel pump inlet.
STBY PUMP ON White The associated (L or R) standby fuel pump is
receiving electrical power.
Pilot’s Manual
2-34 PM-132A
The following CAS illuminations are specific to the XFLOW switch and
crossflow shutoff valve:
FUEL INDICATING SYSTEM
The fuel indicating system consists of a refueling control panel, a fuel
quantity signal conditioner, sixteen wing tank fuel quantity probes
(eight each wing), and a fuselage tank fuel quantity probe. The system
provides fuel quantity accuracy which indicates zero at zero fuel and is
corrected for pitch and roll through the AHRS system.
Power for the fuel indicating system is 28-vdc supplied through the
1-amp L and R QTY circuit breakers located within the FUEL groups of
the pilot and copilot circuit breaker panels respectively.
REFUELING CONTROL PANEL
The refueling control panel is located on the exterior of the aircraft below
the right engine pylon. The panel is energized by the FUEL PNL
ON/OFF switch. The DEFUEL/READY/OFF switch opens the defuel
shutoff valve and the crossflow shutoff valve when selected to READY
for defueling operations. An amber LED indicator above the READY
will illuminate when both valves are open. A green LED indicator below
the OFF will illuminate when both valves are closed. A four-digit
LED labeled TOTAL FUEL QTY will indicate total usable fuel in LB or
KG depending on aircraft configuration.
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