With the selector switch positioned to N (nor-
mal), a mixture of air and oxygen is available
up to a cabin altitude of 30,000 feet. Above this
altitude, 100% oxygen is available and, at al-
titudes above 35,000 feet, the supply is at pos-
itive pressure. By selecting 100%, pure oxygen
is provided at all altitudes. Also, by either
turning the regulator knob to EMERGENCY
or by depressing the knob to the PRESS TO
TEST position, pure oxygen is supplied at a
positive pressure.
An in-line flow indicator indicates DEBIT
when oxygen flows.
PASSENGER OXYGEN SYSTEM
With the master SUPPLY valve open, oxygen
passes to the barometric valve. This valve
opens automatically when the cabin altitude
reaches 12,000 ±500 feet, allowing oxygen
to flow to each of the passenger masks via a
normally open passenger supply shutoff valve.
Supply pressure operates the dropout (de-
ployment) mechanism, which opens the mask
compartment door, allowing the passenger
mask to drop out (Figure 17-1). When the
mask is pulled down for use, a retaining clip
releases a valve, and oxygen flows at a con-
tinuous rate to the wearer. Flow to an individual
mask can be stopped by reinserting the re-
taining clip.
During automatic operation of the passenger
oxygen system, the barometric valve moves the
PASSENGER SUPPLY EMERGENCY valve
(red) control knob upward to its on position (see
Figure 17-4). If necessary, the pilot can man-
ually supply oxygen to the system at any cabin
altitude by pulling the control knob to the on
(PULL TO OPERATE) position. The oxygen
supply may be terminated by pushing the knob
to the off (PUSH FOR OFF) position whenever
the cabin altitude falls below 11,000 feet.
THERAPEUTIC OXYGEN
OUTLETS
The therapeutic oxygen outlets are located in
the cabin (see Figure 17-7). The outlets are
self-sealing and receive their oxygen supply
via the master SUPPLY valve. The masks used
Revision 1
17-5
FOR TRAINING PURPOSES ONLY
HAWKER 800 XP
PILOT TRAINING MANUAL
FlightSafety
international
Figure 17-7. Therapeutic Oxygen
Outlet and Mask
Summary of Contents for 800 XP
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