Pilot’s Manual
PM-132A
1-1
AIRCRAFT GENERAL DESCRIPTION
The Learjet 40 aircraft, manufactured by Learjet Inc., is an all metal,
pressurized, low-wing, turbofan-powered monoplane. The high-aspect
ratio, fully cantilevered, swept-back wings with winglets are of conven-
tional riveted construction except for the upper section of the winglets,
which utilize full-depth honeycomb core bonded to the outer skin.
The
fuselage is of semimonocoque construction and utilizes a constant cir-
cular cross sectional shape across the upper fuselage half and an elon-
gated cross sectional shape in the lower fuselage. The constant upper
circular section extends back to the aft pressure bulkhead where it is
faired into the tailcone. Two inverted “V” ventral fins (delta fins) are fit-
ted to the aft section of the tailcone to provide the aircraft with
favorable stall recovery characteristics and additional lateral/
directional stability.
Thrust is provided by two pod-mounted TFE-731-20 turbofan engines
manufactured by Honeywell. Independent fuel systems supply fuel to
the engines with fuel storage provided in wing and fuselage tanks. En-
gine-driven hydraulic pumps provide hydraulic power for braking, ex-
tending or retracting the landing gear, wing flaps, spoilers, and thrust
reversers. The landing gear system is a fully retractable tricycle-type
trailing link landing gear with dual main gear wheels, nose-wheel
steering, and a brake-by-wire brake control/anti-skid braking system.
The ailerons, rudder, and elevator are manually controlled through
cables, bellcranks, pulleys, and push-pull tubes. An electrically-
actuated trim tab is installed on the left aileron and on the rudder to
provide lateral and directional trim. Longitudinal trim is accomplished
by changing the incidence of the horizontal stabilizer with an
electrically-operated linear actuator. Aircraft air conditioning systems
which include an air cycle machine, provide heating, cooling, and
pressurization for the cockpit, passenger compartment and aft lavatory.
SECTION I
GENERAL DESCRIPTION