4L-8 Developed for Training Purposes Leerjet 35/36
February 1998
CAE SimuFlite
Stow
Placing the thrust reverser levers in stow (full forward and
down) operates reverser control switches that energize the
reverser control relays to the stow position. As engine RPM
decreases and bleed air pressure decreases below 40 PSIG,
the bleed air valves close to enable the actuator to reverse
direction. The bleed air valves open, the DEPLOY light extin-
guishes, and the UNLOCK light illuminates. An interlock pre-
vents thrust reverser lever movement while the thrust reverser
is in transit.
When the pneumatic actuator begins moving the gear rack, the
blocker doors move to the full open position. As the gear racks
enter their sequencing latches, the latches engage to lock the
translating beams and gear racks together. The translating
structure then continues moving forward toward the fully
stowed position.
The latches engage and the nulling cable turns off bleed air to
the pneumatic actuator. The UNLOCK annunciators extinguish;
the thrust reverser returns to the armed condition.
Automatic Stow Cycle
If a pneumatic latch disengages with the thrust levers above
the idle thrust position, the UNLOCK light illuminates. The
thrust reverser system automatically routes bleed air to the
pneumatic actuator to drive the translating assembly toward the
stow position. The actuator continuously applies torque to the
translating assembly until the thrust reverser pneumatic latches
re-engage.
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