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supplied by the mask to the crewmember:
• N (normal diluted oxygen)—Forward
switch position. Reduces the rate of oxygen
usage by mixing oxygen with normal
cockpit air at a ratio determined by
cabin altitude.
• 100% (pure oxygen)—Aft switch position.
Provides only pure oxygen from the
oxygen bottle. No cockpit air is mixed
with the flow. The mask is required to
be set to 100% and checked prior to
flight in order to qualify as a quick-donning
mask.
EMERGENCY–PRESS TO TEST Knob
The red EMERGENCY–PRESS TO TEST
knob/button is a mechanical valve on the underside
of the mask. The knob controls the
pressure of oxygen supplied by the mask to the
crewmember and the button is pressed to test
and check if oxygen is available:
• EMERGENCY position (clockwise, toward
crewmember)—Provides oxygen
under positive pressure, regardless of
crewmember breathing.
• Demand-breathing position (not labeled;
counterclockwise, away from crewmember)—
Provides oxygen on demand as
determined by crewmember breathing.
This is the normal setting.
• PRESS TO TEST function—Springloaded
button in the center of the knob.
Pressing the button on the knob causes
a positive pressure and flow of oxygen
Figure 17-12. Crew Mask Controls to the mask until the button is released.
Vent Valve
When smoke goggles are worn, they fit over
the vent on the top of the mask nosepiece. A
vent valve control on the front of the mask
nosepiece slides forward to open the vent to
allow oxygen to enter and clear the smoke
goggles.
NOTE
Open the vent valve only if pressure
breathing (EMERGENCY position)
has been selected. If the vent is
opened when the mask is in the other
position (demand breathing), smoke
may be drawn into the mask.
Flow Indicator
A flow indicator (slide in the mask hose near
the connector to the oxygen panel) shows clear
when oxygen is available to the mask and is
flowing. It shows black when there is no flow.
OPERATION
For specific, current instructions on normal operations,
refer to the AFM. Where the following
information differs from the AFM, use the
AFM information and follow the AFM instructions.
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
510OM-00 17-9
CITATION MUSTANG OPERATING MANUAL
17-10 510OM-00
CITATION MUSTANG OPERATING MANUAL
　
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