Leerjet 35/36 Developed for Training Purposes 4L-5
February 1998
Thrust Reversers
Thrust Reverser
Two different thrust reverser systems are available on the Lear-
jet 35/36: the Dee Howard TR4000 and the Aeronca TFE731.
The Dee Howard TR4000 system is a target-type reverser that
is electrically controlled and hydraulically operated. The
Aeronca TFE731 is a cascade-type reverser that is electrically
controlled and pneumatically operated.
Dee Howard TR4000
Control of the TR4000 system is accomplished by the ARM-
OFF-TEST switches and the thrust reverser levers. System
operation is monitored by the ARM and DEPLOY annunciator
lights.
The system is checked by moving the ARM switches to the
TEST position. Illumination of the ARM annunciator indicates
that the hydraulic isolation valve is operating correctly and
hydraulic pressure is available to the control valve.
The system is armed when the aircraft is on the ground, the
throttle levers are at IDLE, and the ARM switches are in the
ARM position. If these conditions are met, pulling the thrust
levers up and aft initiates the deploy sequence. When the
thrust reverser doors are fully deployed, the DEPLOY lights illu-
minate and the thrust reverser lever locks are released. The
thrust reverser levers can then be pulled further aft for maxi-
mum reverse thrust.
When the reverser levers are returned to the stowed position,
the hydraulic stow actuator moves the reverser doors to the
overstow position. The doors are held closed by four mechani-
cal latches on each engine.
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