Leerjet 35/36 Developed for Training Purposes 4F-5
October 2001
Fuel System
Fuel System
The fuel system is comprised of three subsystems:
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a fuel storage system that includes the integral wing
tanks, tip tanks and bladder fuselage tank; in addition, the
fuel vent system is considered part of the storage sys-
tem.
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a fuel distribution system that includes the pumps, valves
and plumbing required to move the fuel through the air-
craft to the engines; fuel filtration and jettison are part of
the distribution system.
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a fuel quantity indication system that consists of fuel indi-
cators and annunciators, and probes and sensors that
provide them with data.
Fuel Storage
Each tip tank holds approximately 175 U.S. gallons (approxi-
mately 1,200 lbs) or fuel (refer to Servicing). Baffles restrict fuel
movement to prevent fuel sloshing that might cause sudden
center-of-gravity shifts during maneuvering. Each tip tank also
has a fuel filler cap and an electrically operated fuel jettison
valve. A jet pump, supplied with motive flow fuel from the
engine-driven fuel pump, transfers fuel from the tip tank into the
wing tank.
Formed by the #1 and #7 wing spar, the wing tanks (i.e., main
fuel tanks) extend from the aircraft centerline bulkhead to the
wing tip rib. Each tank holds approximately 187 gallons
(approximately 1,254 lbs).
Wing ribs with one-way flapper valves and vent openings divide
the wing tanks into compartments. The flapper valves permit
fuel flow inward but restrict outward flow to prevent sudden
shifts in the aircraft’s lateral balance.
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