4F-6 Developed for Training Purposes Leerjet 35/36
October 2001
CAE SimuFlite
The fuselage fuel tank consists of two (Learjet 35) or four
(Learjet 36) bladder-type cells aft of the rear pressure bulk-
head. During fueling, the wing tank standby pumps are used to
fill the fuselage tank. As the engines consume fuel, an electric
transfer pump in the fuselage tank can transfer fuselage fuel
forward into the wing tanks. Each tank holds approximately 200
(Learjet 35) or 379 (Learjet 36) gallons.
A ram air scoop on the underside of the left and right wing pres-
surizes the fuel tanks during flight to ensure positive fuel flow to
the fuel pumps. Wing tanks are vented through vent tubes into
the tip tanks. As fuel level in the tip tanks rise, float valves in the
vent lines close to prevent fuel from entering the fuel venting
system. Vacuum and pressure relief valves in the tip tanks
assist the normal venting system if a negative pressure exists
or a tank overpressurizes because of fuel expansion.
Fuel Distribution
There are two distribution systems: one for each engine. The
fuel supply to the engine always comes from its respective
main wing tank. Fuel distribution is managed by the fuel control
panel on the center pedestal.
Each wing tank has two pumps: a jet pump and a standby elec-
tric pump. The jet pump uses motive flow fuel from the
enginedriven fuel pump to draw fuel from the tip tank to the
wing tank.
The standby pump provides fuel pressure to the engine-driven
pump during start and provides pressure during crossflow and
fuselage fill operations. The standby pump is also a backup for
the jet pump should it fail. The engine-driven fuel pump suction
feeds from its respective tank below 25,000 ft altitude.
In the event of an engine fire, pulling the FIRE PULL or ENG-
FIRE PULL T-handle on the glareshield provides DC power to
close the firewall shutoff valve. Power is also provided to open
the valve when the handle is pushed in.
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