4I-12 Developed for Training Purposes Leerjet 35/36
February 1998
CAE SimuFlite
Normal Braking
Applying pressure against the toe brakes mechanically opens
the brake valves that direct hydraulic pressure to the brake
assemblies through the anti-skid valves, hydraulic fuses, and
shuttle valves. The brake assembly pistons extend to force the
rotating disks and stationary disk together. Braking pressure is
proportional to the effort applied through the toe brakes.
During braking with the ANTI-SKID switch in the ON position,
the output signal from each wheel transducer is compared by
the anti-skid control box. If one wheel transducer decelerates
faster than the other, a rate-of-change voltage is measured. If
this voltage exceeds a preset level as determined by the anti-
skid control box, a signal is sent to the respective pressure con-
trol valve to release braking pressure for that wheel. This pre-
vents a possible skid. When the wheel spins up and the rate-of-
change voltage falls below the predetermined level, the system
reapplies braking pressure.
If a fault occurs in any of the anti-skid system components, the
respective ANTI-SKID GEN light illuminates to indicate the affe
cted wheel(s).
Emergency Braking
If the normal braking fails, pull the emergency brake control
handle out of its locking detent and apply downward pressure
to activate the emergency brake system. As the handle is
pushed down, air flows from the emergency air bottle, through
the control valve, to the shuttle valves. The shuttle valves then
shift to isolate the pneumatic system from the hydraulic system
and pneumatic pressure applies the brakes. The anti-skid sys-
tem is inoperative during emergency braking operation. Raising
the handle releases pressure and the brakes release. Each
time the handle is raised, the nitrogen pressure is vented over-
board.
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