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actuate to deenergize the transfer pump, close the transfer valve, and,
if squat switch is in the air mode, illuminate the applicable green WING
FULL light (the crossflow valve will remain open). If switch remains in
the XFR position, fuel transfer will automatically reactivate when the
fuel level in the wings is low enough to extinguish the WING FULL
lights. If the fuselage tank should empty before the wing float switches
shut down the transfer system, a pressure switch in the fuselage tank
transfer line will illuminate the white FUS TANK EMPTY light. Setting
the switch to OFF will extinguish the white FUS TANK EMPTY and/or
WING FULL lights (if illuminated), close the left transfer valve, deenergize
the transfer pump, and close the crossflow valve.
FUS TANK GRAY XFR SWITCH
The FUS TANK GRAV XFR switch onthe fuel control panel can be used
to transfer fuselage fuel without using the transfer pump. The switch
has two positions : OPEN and CLOSE.
When the switch is set to OPEN, both transfer valves will open, the
crossflow valve will open, and both standby pumps will be rendered
inoperative. Fuel will then gravity flow from the fuselage tank to the
wing tanks until the wings are full or the wing and fuselage tank heads
are equal. When using this method to transfer fuel, approximately 150
to 300pounds (68 to 136 kilograms) (depending upon flight attitude) of
fuel will remain in the fuselage tank and the FUS TANK EMPTY light
will be inoperative . To assure all possible fuel has been transferred, reference
must be made to the fuel quantity indicator. The switch should
be set to CLOSE when all fuel possible has been transferred and during
approach and landing. Loss of power to the crossflow and transfer
valves causes the valves to remain in their last position. The crossflow
and transfer valves are operative during EMER BUS mode.
FUS TANK SWITCH PRIORITY
If the FUS TANK switches are positioned to contradictory positions the
FUS TANK XFR-FILL switch will have priority over the FUS TANK
GRAV XFR switch.
PM-121
2-27
Change 3
Pilot's Manual
Learjet 31A
FUS TANK FULL LIGHT
The green FUS TANK FULL light, on the fuel control panel, is installed
to indicate a fuselage tank full condition during fuselage tank fill operations.
The light is illuminated through actuation of the fuselage tank
float switch. During normal fuselage tank fill operations, actuation of
the float switch will illuminate the FUS TANK FULL light, close the
transfer valves, and shut down the standby pumps. The FUS TANK
XFR-FILLswitch must be set to OFF to extinguish the light.
FUS TANK EMPTY LIGHT
The white FUS TANK EMPTY light, on the fuel control panel, is installed
to indicate a fuselage tank empty condition during fuel transfer.
The light is operated by a pressure switch in the left fuselage fuel transfer
line. As the fuselage tank empties during transfer operations, the
pressure switch senses a loss of pressure in the transfer line and complete
circuits to illuminate the FUS TANK EMPTY light. The transfer
pump will continue to operate until the FUS TANK XFR-FILL Switch is
set to OFF. Setting the FUS TANK XFR-FILL to OFF will extinguish the
light and deenergize the transfer pump.
STANDBY PUMP LIGHTS
On aircraft 31-037 and subsequent, a white standby pump light is installed
adjacent to eachSTANDBY PUMP switch. Illumination ofeither
light indicates power is applied to the corresponding standby pump.
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FUEL CONTROL PANEL
Figure 2-7
2-28
PM-121
Change 4
Learjet 31A
Pilot's Manual
FUEL VALVE LIGHTS
Steady illumination of any of the amber fuel valve lights on the fuel
control panel indicates the corresponding valve is not in the position
selected or a loss of power. Momentary illumination while the corresponding
valve is in transit after switching modes indicates proper
operation.
WING FULL LIGHTS
Twogreen WING FULL lights, on the fuel control panel, are installed
to indicate a wing-full condition during inflight fuel transfer operations
(crossflow valve open). The lights are illuminated by the wing
high-level float switches if the squat switch is in the air mode. During
normal fuselage fuel transfer procedures, actuation of either highlevel
float switch will deenergize the transfer pump, close the left
transfer valve, and illuminate the appropriate WING FULL light.
During gravity fuselage fuel transfer procedures, actuation of either
high-level float switch will illuminate the appropriate WING FULL
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