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VENTURI
A venturi located in the forward luggage bay
area extracts air from the autocontroller dur-
ing normal operation. In manual operation, it
extracts air from one of the outflow/safety
valves via the manual control valve on the
copilot’s side console.
AIR JET PUMP
The air jet pump located on the rear pressure
bulkhead extracts air from the outflow/safety
valves during normal operation. This pump,
operated by engine bleed air, ensures that
the desired differential between the outflow
valve reference pressure and cabin pressure
is maintained.
PRESSURE REGULATORS
The two pressure regulators function as safety
devices if there is a loss of cabin air pressure.
The regulators, located on the rear pressure bulk-
head, shut both outflow/safety valves when the
cabin altitude reaches 13,500 ±1,500 feet, thus
minimizing a further drop in cabin pressure.
FAN-OPERATED VENTURI
The fan-operated venturi is also located on
the rear pressure bulkhead. It is controlled by
the PRESSN switch (Figure 12-2) which is
located on the roof panel.
With the PRESSN switch in the AUTO position
and the airplane on the ground, the venturi op-
erates (fan running) if an engine or APU air
valve is open or for approximately 20 seconds
after the aircraft has landed. With the weight off
the wheels (in flight), the fan stops, thus allow-
ing the cabin to be pressurized. With the switch
in the OVRD position and the airplane on the
ground, the fan stops, the venturi ceases opera-
tion, thus allowing the cabin to be pressurized.
CONTROLS AND INDICATORS
In addition to the CABIN and the RATE knobs
o n t h e C A B I N C O N T RO L L E R a n d t h e
PRESSN switch on the roof panel, the pres-
surization system incorporates the following
controls and indicators:
• CABIN ALTITUDE warning annunciator
• CABIN triple indicator
• Warning horn
• HORN ISOLATE button
• MANUAL CABIN ALTITUDE CON-
TROL knob
• PRESSURIZATION CONTROL lever
• DUMP VALVE lever
CABIN ALTITUDE Warning
Annunciator and Horn
The CABIN ALTITUDE warning annunciator
(Appendix B) and warning horn alert the crew
that the cabin has exceeded an altitude of
9,300 feet.
When this occurs, the following takes place:
• At 9,300 ±300 feet (cabin altitude), the
CABIN ALTITUDE warning annuncia-
tor lights and the warning horn sounds.
The horn may be silenced by depressing
the HORN ISOLATE pushbutton located
on the No. 1 throttle lever (Figure 12-3).
12-4
FOR TRAINING PURPOSES ONLY
HAWKER 800 XP
PILOT TRAINING MANUAL
FlightSafety
international
Figure 12-2. PRESSN Switch
Содержание 800 XP
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