Hawker Beechcraft Hawker 800XP, Руководство по эксплуатации для пилотов

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Page 8-17
Pilot’s Operating Manual
Original Issue: Feb, 2002
Sub-section 8
LANDING GEAR
Hawker 800XP Pro Line 21
Section III - SYSTEMS DESCRIPTION
A combined hydraulic pressure indicator shows the BRAKE pressures (upper indication) applied to the
left and right brake units during normal operation.
The BRAKE indications are electrically operated from pressure transmitters connected into the normal
supply lines to the brake units. The indicator also provides the main hydraulic system SUPPLY pressure
(lower indication).
Emergency System Operation with Main System Pressure Exhausted
Movement of the WHEEL BRAKE lever rearward into the EMERGY notch effects the change from
normal to emergency operation. An emergency reducing valve opens to allow emergency brakes
accumulator pressure to enter the brake control valve. Brake pedal movement now results in pressure
being applied directly to the brake units. Shuttle valves operate to isolate the normal supply so that the
modulator units and Maxaret units are inoperative.
With the emergency system selected, the BRAKE indications continue to show normal system
pressure to the brakes (provided there is still pressure in this system) but do not show emergency
system braking pressure. WHEEL BRAKE EMERG annunciators with the legends L and R are provided
to the right of the combined indicator and provide an indication of applied pressure to each brake unit.
Each annunciator is controlled by a pressure switch connected into the emergency supply line to the
related brake unit. During brake pedal operation, the white annunciators are illuminated when the
applied pressure reaches 1000 psi and remain on until the pressure is released to below this value.
The WHEEL BRAKE EMERG annunciators also act as a reminder that the anti-skid facility is isolated
and that braking is direct.
OFF
2 2
1 1
0
0
BRAKE
2
3
1
4
OFF
SUPPLY
0
PSI x 1000
L R
EMERG
WHEEL
BRAKE
Figure 8
Combined Hydraulic Pressure Indicator and Emergency Wheel Brake Annunciators
Left Gear
Brake Supply Pressure
Right Gear
Brake Supply Pressure
Main Hydraulic System
Supply Pressure