T-45A UJPT, E2-C2, ADV & IUT Eng-13
Hydraulic Subsystems
(3) Unacceptable condition is indicated
Sg 2, fr 9
by flush or recessed indicators
HYD 1
HYD
PARKING
BRAKE
WHEELBRAKES
ACCUM INF
P
2
A
PRESS 1300 lbs/in
R
K
86BARS
d.
With both ANTI-SKID switches ON,
I
N
BRAKE
G
MASTER
B
R
2
0
A
CYLINDERS
K
10
E
30
0
40
hydraulic pressure from brake control
2
1
3
ANTI-SKID
ANTI-SKID
0
4
PSI
X
1000
BRAKE
FLAP
ANTI-SKID
SYSTEM
DE-SPIN
valve is regulated by anti-skid valve
ACTUATOR
O
N
2
1
3
0
4
BRAKE
PSI
OFF
ANTI-SKID
X
1000
CONTROL
CONTROL
BRAKE
VALVE
BOX
which is controlled by anti-skid control
SPEED SENSOR
SPEED SENSOR
ANTI-SKID
ANTI-SKID
O
N
VALVE
OFF
HYD1RETURN
box
WHEEL BRAKE/ANTI-SKID SYSTEM
BLOCK DIAGRAM
(1) Speed sensors on both wheels
send relative rotation speed to
anti-skid control box
(2) When speed sensor senses an
impending skid, the anti-skid
control box signals anti-skid valve
to reduce brake pressure on both
wheels. As wheel rotational speed
recovers, brake pressure is
reapplied to a level just below that
which caused the skid
(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
(assumes that anti-skid is turned
off)
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
(8-03) Original
Page 13-25
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