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Table 17-1 depicts the average time of useful
consciousness (time from onset of hypoxia
until loss of effective performance) at various
altitudes.
OXYGEN CYLINDER
ASSEMBLY
Two 750-liter oxygen cylinders store oxygen
at 1,800 psi at 70° F. They are located in the
rear equipment bay (Figure 17-2). A third
1,100-liter cylinder may be installed when in-
creased system capacity is required. Each
cylinder has a shutoff valve which is normally
lockwired to the open position.
All cylinders are filled through one charging
valve. A contents indicator (gage) (Figure 17-
3) and a line filter, which incorporates a burst-
ing disc, are parts int he charging supply line;
therefore, cylinder pressure is present at the
gage and the filter. If excess pressure is applied,
the disc bursts and the cylinders vent to the at-
mosphere. Additionally, the oxygen cylinders
incorporate an automatic shutoff valve installed
in the supply line. The shutoff valve automati-
cally closes should there be a break of the sup-
ply line downstream of the valve.
OXYGEN SYSTEM CONTROLS
The oxygen panel is mounted on the base of the
left console (Figure 17-4). The panel has a
master SUPPLY valve, a PASSENGER SUP-
PLY EMERGENCY valve control knob which
controls the manual operation of a barometric
valve, an OXYGEN CONTENTS gage, and
two TEST connections for the barometric valve.
The master SUPPLY valve controls the oxygen
supply from the cylinders. Turning the valve
to the ON position provides oxygen to the pres-
sure regulator. The regulator reduces the 1,800-
psi oxygen down to 70 psi. If the pressure
exceeds 90 psi, a relief valve in the regulator
bleeds the excess into the cabin. Also, with the
SUPPLY valve in the ON position, the OXY-
GEN CONTENTS gage reads direct system
high pressure, thus allowing the pilot to mon-
itor the oxygen system quantity. Gage mark-
ings are FULL, 3/4, 1/2, 1/4, and EMPTY.
Revision 1
17-3
FOR TRAINING PURPOSES ONLY
HAWKER 800 XP
PILOT TRAINING MANUAL
FlightSafety
international
Figure 17-2. Oxygen Cylinders
Figure 17-3. Oxygen Servicing Panel
Figure 17-4. Oxygen System Controls
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