Hawker 800 XP, Pilot Training Manual

Page: 329 / 504

HAWKER 800 XP PILOT TRAINING MANUAL
FlightSafety
international
INTRODUCTION
The Hawker 800 XP airplane incorporates a pressurization system that includes a con-
troller, two outflow/safety valves, and a venturi. Cabin pressure is automatically con-
trolled by the two outflow/safety valves which are pneumatically operated to maintain
the 8.55 psi differential between cabin and ambient pressure. These valves govern the
exhausting of cabin air to the atmosphere. Safety devices completely shut off the out-
flow when the cabin altitude reaches a preset value.
The outflow/safety valves also provide inward and outward relief for both negative and
positive differential conditions in order to protect the airplane’s structure. A full range
of manual control is available in the event of a malfunction of the automatic control by
utilizing the manual pressurization controls on the copilot’s side console. A dump
valve provides cabin pressure control when the normal system control is inoperative.
It can also be used in conjunction with a ram-air supply to ventilate the cabin while it
is unpressurized.
The purpose of the pressurization system is to ensure crew and passenger survival and
comfort regardless of the airplane’s altitude.
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CHAPTER 12
PRESSURIZATION
12-1
FOR TRAINING PURPOSES ONLY