The steering disconnect and quick-
release pins must be installed prior
to taxiing.
Noswheel steering is not available
when the main hydraulic pressure is
less than 2,300 psi.
The auxiliary hydraulic system can-
not power the steering circuits.
BRAKES
GENERAL
The main hydraulic system provides pressure
to actuate the caliper disc-type, self-adjusting
brake assemblies, one on each main gear wheel.
Master cylinders, operated by mechanical link-
age from the tops of the rudder pedals, provide
control pressure for brake operation. Selection
of normal, emergency, or parking brake is made
with the WHEEL BRAKE lever on the center
pedestal. Antiskid protection is provided dur-
ing normal braking only.
OPERATION
Normal
Normal braking is available with the WHEEL
BRAKE lever in the NORMAL (full forward) po-
sition. Main hydraulic system pressure backed
by the main accumulator is reduced and supplied
to the brake control valves (Figure 14-10). Pres-
sure applied to the toe brake pedals by either the
pilot or copilot provides master cylinder pres-
sure to position the brake control valves.
Braking pressure, in proportion to pedal force,
is directed through modulators to the brakes.
Wheel-driven antiskid (Maxaret) units provide
constant antiskid protection by detecting ex-
cessive wheel deceleration and releasing brak-
ing pressure as required with wheel rotation.
Pressure in the brake lines being applied to the
brakes is indicated on the BRAKES scale of
the DC-powered hydraulic pressure indica-
tor. Relieving toe pressure on the toe brake ped-
als relieves master cylinder pressure on the
brake control valve, venting braking pressure
to the return system and releasing the brakes.
Main Hydraulic System Failure
General
When main hydraulic system failure occurs, a
pressure-maintaining valve closes to trap main
system accumulator pressure for braking. Nor-
mal braking with Maxaret control is available
for landing under average conditions. Wet run-
way conditions will decrease the applications
available.
After landing under the above con-
ditions, the aircraft should not be
taxied.
Selection of emergency brakes should be de-
layed until main system accumulator pressure is
exhausted, since Maxaret control is not available
with emergency brakes. With a fully charged
emergency brake accumulator, approximately
18 brake applications are available.
During the landing roll, the brakes
should be applied gently. The air-
craft should not be taxied.
CAUTION
CAUTION
CAUTION
CAUTION
14-12
FOR TRAINING PURPOSES ONLY
HAWKER 800 XP
PILOT TRAINING MANUAL
FlightSafety
international
Summary of Contents for 800 XP
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