PNEUMATICS
The Hawker 800 XP uses engine bleed air to
supply pneumatically operated airplane sys-
tems. Each engine has a low- and high-pres-
s u r e b l e e d - a i r p o r t . L ow - p r e s s u r e a i r i s
provided to the air-conditioning, pressuriza-
tion, and rudder bias systems. Low-pressure
air is also used for the air jet pump and to
pressurize the hydraulic reservoir. Normal op-
eration of the system introduces high-pres-
sure air to supplement the low-pressure air
supply to the air-conditioning system at low
power settings to maintain minimum pressure
requirements. Pneumatic controls are located
on the roof panel, and fault annunciators are
located on the center instrument panel.
ICE AND RAIN PROTECTION
The Hawker 800 XP is approved for flight into
known icing conditions when the required
equipment is installed and operational. Ice de-
tection is provided by a rotary-cutter system and
two wing ice-inspection lights. The wing and
horizontal stabilizer leading edges are anti-
iced by a TKS fluid system. The windshields
and forward sidescreens are electrically heated
to prevent icing. Windshield rain removal is ac-
complished by the aerodynamic shape of the
windshield. Electric heating also is provided for
the pitot heads, forward static plates, rudder bias
struts, and airflow angle sensors. Engine cowl-
ings are anti-iced by engine high-pressure bleed
air. The PT2/TT2 sensor is electrically heated.
AIR CONDITIONING
Air supply for air conditioning is taken from
the low- and high-pressure bleeds of each en-
gine. The air passes through a ram-air heat ex-
changer and then a refrigeration (cooling
turbine) unit. Precooling of engine bleed air
is accomplished in the ram-air heat exchanger.
The ram cooling air is provided through the
dorsal intake duct. On the ground, airflow is
induced through the heat exchanger by a fan
driven by the cooling turbine. The bleed air
then flows to the three-wheel cold air unit
where the conditioned air temperature is reg-
ulated by the amount of air allowed to pass
through the turbine. The more air that passes
through the turbine, the cooler the temperature.
The more air that is allowed to bypass the
cooling turbine, the warmer the temperature.
The conditioned air is then routed through a
water separator to remove moisture. Either
engine bleed air or APU bleed air can be used
for the air-conditioning system when on the
ground. Engine bleed only can be used when
airborne. Full range manual control of tem-
perature is available in the event of malfunc-
tion of the automatic features.
PRESSURIZATION
The cabin is pressurized by engine bleed air
through the air-conditioning system. Cabin
pressure is automatically controlled by two
outflow/safety valves which are pneumati-
cally operated by the difference between cabin
and ambient pressures. These valves govern the
exhausting of cabin air to the atmosphere.
Safety devices completely shut off the outflow
when the cabin altitude reaches a preset value.
Full range manual control of pressurization is
available in the event of malfunction of the au-
tomatic features. A dump valve is provided to
control cabin pressure when normal system
control is inoperative. When the dump valve
is selected fully open, a ram-air valve opens
to ventilate the unpressurized cabin.
HYDRAULIC POWER SYSTEMS
The Hawker 800 XP has both main and aux-
iliary hydraulic systems. The main system
is pressurized by two engine-driven pumps,
one on each engine. The system provides
pressure for actuation of the landing gear,
flaps, airbrakes, nosewheel steering, brakes,
and stick pusher. System operation is moni-
tored by annunciators and a system pressure
gage. The auxiliary hydraulic system is pres-
surized by a hand pump. It provides pressure
for emergency extension of the landing gear
and for flap operation.
1-18
FOR TRAINING PURPOSES ONLY
HAWKER 800 XP
PILOT TRAINING MANUAL
FlightSafety
international
Содержание 800 XP
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