T-45C TS, ADV & IUT ENG-11
Hydraulic Subsystems
locked and launch bar EXTENDED with
LAUNCH BAR switch in the RETRACT position.
Once engaged, the system then monitors 95%
throttle position, LDG GEAR down and locked
condition, NWS button relays, and parking
brake handle position to determine normal
brake operation or system commanded brake
release
b.
BRK PRESS caution light
(1) Location: caution/advisory panel, both
cockpits, added to advisory panel just
above the HOOK warning light
(2) Purpose: indicates a system failure or
indicator circuit failure
3.
Operating characteristics
a.
Electrically controlled (28 VDC essential bus)
b.
The brake pressure release during catapult
launch modification was incorporated to prevent
main mount tire(s) blow out due to inadvertent
brake pressure being applied to the brake
pedal(s) during catapult launch. The brake
pressure release system is activated with:
(1) The LDG GEAR down and locked
(proximity switch relay-right main LG)
(2) The launch bar down and locked in the
shuttle, with the LAUNCH BAR switch
selected to RETRACT (up position)
(3) Throttle position greater than 95%
(4) Nose wheel steering button NOT pressed
(5) Parking brake handle in (OFF)
These conditions are met only when the aircraft
is locked in the shuttle and ready for launch.
(9-98) Change 4
Page 11-31
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