Hydraulic Subsystems
T-45C TS, ADV & IUT ENG-11
HYD 1 produces the hydraulic pressure used by the
brakes/anti-skid system. If HYD 1 fails, operation of
the brake system depends on the wheel brake/
emergency flap accumulator for hydraulic pressure,
in which case the anti-skid system must be set to
OFF or it will rapidly deplete the hydraulic pressure
maintained in the wheel brake/emergency flap
accumulator. Cockpit controls and indicators used
to operate the brakes/anti-skid system include the
brake pedals, the BRAKE (wheel brake/emergency
flap accumulator) pressure gauge, the PK BRK
caution light, the PARKING BRAKE handle, the
ANTI-SKID switch, the SKID caution light, the
SKID advisory light. An additional wheel brake/
emergency flap accumulator pressure gauge is
located in the right main wheelwell on the exterior of
the aircraft.
B.
Brake Pressure Release System [AFC 256, PT2]
1.
Major components
a.
Components added include an additional
launch bar proximity switch, a BRK PRESS
caution light, and an anti-skid control box
modification (EMI filters)
b.
Pre-existing aircraft components used by the
system include the 95% throttle position
proximity switch, the right and left main landing
gear down and locked proximity switches,
launch bar proximity switch, anti-skid valve,
parking brake handle proximity switch, and
NWS button
c.
Brake pressure release system designed to
release brake pressure through existing anti-
skid valve, independent of anti-skid control box
2.
Controls and indicators
a.
System commanded brake release is
automatically provided when a combination of
specific conditions are met. The system
engages when it detects LDG GEAR down and
(9-98) Change 4
Page 11-30
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