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The following information is only for
training and background information.
Strictly obey the procedures for the
use of oxygen equipment. Do not
use oil, grease, or other lubricants
made from petroleum in the area of
oxygen equipment. This can cause a
dangerous fire hazard.
Preflight
During preflight, ensure the OXYGEN SUPPLY
control knob is fully pushed in (forward)
to open the shutoff valve on the oxygen bottle.
Check that proper pressure is indicated on
the OXYGEN gauge. Test each crew mask before
flight using the PRESS TO TEST button
to be sure that it is receiving oxygen from the
system. Ensure that oxygen flows into the
mask and to the pilot under positive pressure.
Before takeoff, check that the OXYGEN OFF
message is not displayed and the OXYGEN
VALVE is in the NORMAL position. In Flight
To operate the oxygen system, ensure there is
adequate pressure in the system as indicated
by these three conditions:
• The OXYGEN gauge indicates adequate
supply (refer to AFM)
• The OXYGEN SUPPLY knob is pushed
in (forward) fully
• The OXYGEN OFF message does not
appear
When those conditions are met, the oxygen
system can be operated in one of three modes
as selected by the pilot using the OXYGEN
CONTROL VALVE knob.
Crew Oxygen Mask
Remove the crew oxygen mask from its container
and squeeze the mask so the harness inflation
plate is pressed against the mask to
inflate the harness. Place the harness over the
head and position the mask over the face and
nose, then release the harness inflation plate. The
harness contracts to hold the mask in place.
The crewmember is assured that oxygen is
being received when no restriction to breathing
is present with the mask donned and the
red N–100% diluter rocker switch is set to
100% (aft position). If the cabin altitude is at
or below 25,000 feet, to conserve oxygen when
using the mask, the diluter rocker switch may
be set to normal (N).
NOTE
On crew masks, select 100% oxygen
above 25,000 feet cabin altitude.
At cabin altitudes of 25,000 feet and
below, select normal (N).
WARNING
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CITATION MUSTANG OPERATING MANUAL
For pressure breathing or smoke/fumes protection,
rotate the emergency select knob on
the underside of the mask clockwise toward the
crewmember to the EMERGENCY position
(see Figure 17-10). This position provides a
steady flow of pressurized oxygen to the face
cone and the smoke goggles (if installed).
Maintenance Considerations
Service the oxygen system any time the pressure
gauge indicates inadequate supply, or
when the overboard discharge indicator shows
an overpressure event has occurred.
If the oxygen bottle depletes to empty or if the
oxygen discharge indicator ruptures, the system
must be purged and the oxygen bottle replaced
before the next flight. The original oxygen bottle
must be returned to the supplier for refurbishment
or replacement before further use.
Service the oxygen bottle through the filler
port near the forward bulkhead, inside the
right nose baggage door (Figure 17-13). Only
use aviator oxygen (MIL-O-27210, Type 1)
for servicing. The fill valve incorporates a
check valve and filter. A pressure sealing
cap prevents contaminants from entering the
oxygen system.
LIMITATIONS
Table 17-1 indicates approximate normal duration
of oxygen supply with different numbers
of users.
Due to human physiological limitations,
the passenger oxygen system
is not satisfactory for continuous operation
above 25,000 feet cabin altitude.
The crew oxygen system is not
satisfactory for continuous operation
above 40,000 feet cabin altitude.
Individual physiological limitations
may vary. If crew or passengers experience
hypoxia symptoms, descend
to a lower cabin altitude.
No smoking when oxygen is being
used or following use of passenger
oxygen until lanyards have been
reinstalled.
Oil, grease, soap, lipstick, lip balm,
and other fatty materials constitute
a serious fire hazard when in contact
with oxygen.
Oxygen use limitations are further governed by
the applicable regulations. In the U.S.A., the
pilot must have the oxygen mask on his face during
normally pressurized flight for single-pilot
Part 135 operations above FL 250 or above single-
pilot Part 91 operations above FL 350.
EMERGENCY/ABNORMAL
For specific information on emergency/abnormal
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