Leerjet 35/36 Developed for Training Purposes 4I-9
February 1998
Landing Gear and Brakes
Retraction
When the aircraft lifts off, the left and right squat switches actu-
ate to the airborne mode and allow the landing gear selector
valve to be energized to the retract mode when the gear select
switch is moved from the DN to the UP position. This begins
the retraction sequence by energizing the door control valve to
the down position.
Hydraulic pressure flowing through the door control valve
unlocks the main gear doors through the door uplock actuators
and drives the doors to the open position. This illuminates the
two red UNSAFE main gear lights. When the doors are fully
open, the door down switches energize the landing gear selec-
tor valve to the up position.
Through the landing gear selector valve, hydraulic pressure
flows to the nose and main landing gear actuators. The gear
actuators unlock, the green LOCKED DN lights extinguish, the
red UNSAFE nose gear light illuminates, and the landing gear
begin to retract. When all three retract completely, the gear up
switches actuate to energize the door control valve to the up
position. The main landing gear doors close; the door uplock
actuators lock the doors closed. The nose gear uplock and
main gear door uplock switches then extinguish the red
UNSAFE lights.
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