Hydraulic Subsystems
T-45C TS, ADV & IUT ENG-11
(3) Following a HYD 1 failure, wheel brake/
emergency flap accumulator stores enough
hydraulic pressure for at least 10 brake
applications after an emergency flap
extension
NOTE: Because the anti-skid valve dumps
hydraulic pressure to HYD 1 return, anti-
skid must be de-selected when HYD 1 fails
and the wheel brake/emergency flap
accumulator is supplying all braking
pressure. Anti-skid will rapidly deplete
accumulator pressure, possibly not leaving
enough residual pressure to brake the
aircraft safely.
e.
Anti-skid system touchdown protection: if pilot
has pressure on brake pedals before weight on
wheels, anti-skid system dumps all brake
pressure to system return to prevent locked
wheels (with resulting blown tires) upon
touchdown
f.
Operating parking brake handle mechanically
opens brake control valve, routing system (or
accumulator) pressure simultaneously to both
brake units
NOTE: After engine shutdown, the ANTI-SKID
switch must be set to OFF before setting the
parking brake. If anti-skid is left on and the
battery switches are turned on, pressure to the
parking brake may bleed off over a period of
time.
g.
Brake control valve is mechanically opened by
de-spin actuator when wheels-up is selected,
applying hydraulic pressure to wheel brake
units to stop wheel from spinning prior to
retracting gear
h.
Differential braking may be used to steer
aircraft if NWS is inoperative or de-selected
(9-98) Original
Page 11-28
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