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into the fuselage tank.
ThePARTIAL position of the Refuel Selector switch is used to fill the
wings first and then the fuselage. This is useful when full wings and
less than full fuselage fuel is desired. When PARTIAL is selected and
the vent valve opens, the fuselage tank solenoid valve will be controlled
by the wing high-level float switches. When the wings are full,
the wing high-level float switches complete the circuit to open the fuselage
tank solenoid valve. When the solenoid valve opens the fuselage
tank shutoff valve will open and admit fuel to the fuselage tank.
REMOTE BATTERY SWITCH
The Remote BATswitch, on the refuel control panel, allows operation
of the single-point pressure refuel system without the need to enter
the cockpit in order to energize aircraft power. When the switch is set
to ON, DC power from the aircraft's right battery is applied to the
SPPR control circuits.
FUS FULL LIGHT
The amber FUS FULL light, on the refuel control panel, will illuminate
whenever the fuselage tank float switch actuates. The light illuminates
to alert the operator that refuel operations should have automatically
terminated. If fuel flow continues with the light illuminated,
fueling operations should be immediately terminated.
VENT OPEN LIGHT
The green VENT OPEN light, on the refuel control panel, will illuminate
whenever the fuselage tank vent valve opens. The light is operated
by a switch in the valve. Circuits for the fuselage tank solenoid
valve are wired through this switch to prevent filling the fuselage
tank until the vent valve opens.
PM-in
2-35
Original
Pilot's Manual
Learjet 31A
FUEL ADDRNE
Aircraft equipped with fuel heaters:
Anti-icing additive is not a requirement.
However, for microbial protection, it is recommended that
anti-icing additive be used at least once a week for aircraft in regular
use and whenever a fueled aircraft will be out of service for a week or
more. Refer to the Airplane Flight Manual for the recommended concentration
and the proper method of blending anti-icing additive.
Aircraft not equipped with fuel heaters: Anti-icing additive must
be blended with untreated fuel to prevent possible engine flameout
due to fuel system icing. Refer to the Airplane Flight Manual for the
recommended concentration and the proper method of blending antiicing
additive.
REFUELING
The aircraft is refueled through the filler caps on each wing tip or
through the optional single-point pressure refuel adapter located on
the right side of the fuselage below the engine pylon. Ground jacks
are located on the underside of each wing near the fuel filler and just
aft of the single-point pressure refuel control panel. Refer to the Fuel
Servicing Addenda (Airplane Flight Manual binder) for a list of approved
fuels and refueling procedures.
Learjet 31A
PM-121
Original
FUEL DRAINS
Figure 2-9
Piloes Manual
2-37
1 . Left Wing Scavenge Pump 10. Right Fuel Computer
2. Left Wing Sump 11 . Right Fuel Filter
3. Left Engine Fuel 12. Right Wing Transfer Line
4. Left Wing Vent (Sump) 13. Right Wing Expansion Line
5. Left Wing Expansion Line 14. Right Wing Vent (Sump)
6. Left Wing Transfer Line 15. Right Engine Fuel
7. Fuel Vent (Fuselage) 16. Right Wing Sump
8. Left Fuel Filter 17. Right Wing Scavenge Pump
9. Left Fuel Computer 18. Fuel Crossover
Learjet 31A
Pilot's Manual
TABLE OF CONTENTS
FLIGHT SYSTEMS
Flight Controls .......................................................................................... 5-1
Aileron and Elevator .............................................................................5-1
Rudder.....................................................................................................5-1
Controls Gust Lock................................................................................5-2
Controls Gust Lock (Figure 5-1).......................................................... 5-2
Flaps.........................................................................................................5-3
Flap Selector Switch ...........................................................................5-3
Flap Position Indicator ......................................................................5-3
Spoilers ....................................................................................................5-4
SPOILER Switch .................................................................................5-4
SPOILER Light....................................................................................5-4
Warning Systems ......................................................................................5-5
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