HAWKER 800 XP
PILOT TRAINING MANUAL
FlightSafety
international
Operation
Emergency brake operation is selected by mov-
ing the WHEEL BRAKE lever (Figure 14-11)
aft to the EMERGY position (first notch marked
in red), mechanically opening the emergency
brake reducing valve (Figure 14-12). Emer-
gency brake accumulator pressure is reduced
and applied to the brake control valves. As in
normal operation, pressure on the toe brake
pedals produces master cylinder control pres-
sure to operate the brake control valves. Brak-
ing pressure, in proportion to pedal force, is
directed through shuttle valves to the brake as-
semblies, bypassing the modulators and anti-
skid units. The white L and R WHEEL BRAKE
EMERG annunciators come on as braking pres-
sure in the respective gear brake line reaches
1,000 psi.
Relieving toe pressure on the pedals releases the
brakes in the manner described under Normal
Operation. As the brakes release, the L and R
WHEEL BRAKE EMERG lights go out.
Reduction of emergency brake accumulator pres-
sure below 2,250 psi is indicated by illumination
of the EMRG BRK LO PRESS annunciator.
Parking
With pressure available from both the main
and emergency brake accumulators, both brake
systems are available for setting the parking
brake. Movement of the WHEEL BRAKE lever
aft into the PARK BRAKE range (Figure 14-
13) progressively applies the brakes. At 1,000
psi applied pressure, the WHEEL BRAKE
EMERG annunciators illuminate white. The
brake pressure applied to the left and right
brake units is also displayed on the combined
indicator to show normal system pressure. Full
parking pressure is applied when the WHEEL
BRAKE lever is in the last notch. Pressure sup-
plied by the emergency brake accumulator and
the main accumulator is maintained at the
brakes by a lever that actuates the brake con-
trol valve. A spring strut, initially loaded by aft
movement of the WHEEL BRAKE lever, resets
the control valve when the lever is released to
NORMAL or EMERGY.
ELECTRICAL POWER
SOURCES
PE bus bar
Normal landing gear position annunciators (6)
Warning horn control
Warning horn
WHEEL BRAKE EMERG annunciators L and R
PS1 bus bar
Landing gear lever lock solenoid
Normal BRAKES applied pressure indicator
PS2 bus bar
Standby landing gear downlock annunciators (2)
Revision 1.02
14-14
FOR TRAINING PURPOSES ONLY
Figure 14-11. Wheel Brake Selector Lever
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