Hydraulic Subsystems
T-45C TS, ADV & IUT ENG-11
Brake pressure is returned two (2) seconds
after the launch bar position switch senses that
the launch bar is in the UP position. Reducing
the throttle below 95% will restore brake
pressure immediately. Although not
recommended, pulling the parking brake
handle out/or pressing and holding the NWS
(high-gain) button will also restore brake
pressure immediately
NOTE: A failure of a component of the brake
pressure release system will NOT result in
damage or failure of any component of the
brake or anti-skid systems. With the throttle
below 95%, there is no single point failure that
will result in the loss of brakes during field or
carrier landing, field or carrier taxi, or field
takeoff.
NOTE: Activation of the parking brake handle
deactivates the brake pressure release system
by removing electrical power, deactivating the
release circuit, and applying parking brake
pressure simultaneously. If the anti-skid system
is selected ON it will operate normally with
parking brake application.
c.
The BRK PRESS caution light illuminates when
there is a failure in the brake pressure release
system, i.e., brake pressure is available. The
light may also illuminate in flight with the landing
gear UP due to a single component failure.
However, if the BRK PRESS light illuminates
due to indicator circuit failure, the brake system
is functioning normally, i.e., brake pressure is
available. A loss of brake pressure could only
result from a simultaneous failure of more than
one component. An unlikely probability, this
makes the risk acceptably low. Most likely
brake pressure WILL be available and a normal
approach and landing can be anticipated. Also,
a momentary illumination MAY OCCUR when
the launch bar transitions to the RETRACT
(9-98) Change 4
Page 11-32
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