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CUTOFF knob (see Figure 17-7). The
gauge illuminates internally.
The range markings are as follows:
• Yellow arc................................. 0–400 psi
• Red line................................... 2,000 psi
Service anytime gauge indicates insufficient
volume. Refer to the Airplane Flight Manual
(AFM); normal indication is between 1,600 and
1,800 psig.
OXYGEN OFF Message
The amber OXYGEN OFF message appears
when the oxygen system pressure-sensor switch
detects system pressure below approximately
45–50 psig. The message extinguishes if system
pressure rises above 50–55 psig. This message
also displays when the OXYGEN SUPPLY
knob is in the PULL TO CUTOFF position.
Overboard Discharge Indicator
A green overboard discharge indicator (disc)
is on the right side of the nose section directly
below the nose access door (Figure 17-
11). If the disc is ruptured, the oxygen bottle
510OM-00 17-7
CITATION MUSTANG OPERATING MANUAL
Figure 17-10. Oxygen Pressure Gauge Figure 17-11. Overboard Discharge
Indicator
17-8 510OM-00
CITATION MUSTANG OPERATING MANUAL
has experienced overpressure and is now
empty. If the disc ruptures, perform maintenance
before flight.
Crew Oxygen Mask Controls
and Indications
Each crew mask has the following controls
(Figure 17-12):
• Harness inflation plate
• N–100% diluter rocker switch
• Emergency select knob
• PRESS to TEST button
• Vent valve
• Flow indicator
Harness Inflation Plate
The red harness inflation plate is a mechanical
valve control on the lower-left corner of
the mask, which controls inflation of the harness.
Squeezing the plate against the mask
causes a momentary flow of pressurized oxygen
to the harness. This inflates the harness,
which expands to allow the crewmember to slip
the mask harness over their head. When the
plate is released, the pressure is released from
the harness, which then contracts to hold the
mask firmly to the face of the crewmember.
N–100% Diluter Rocker Switch
The red N–100% diluter rocker switch is a mechanical
valve on the lower-right corner of the
mask. The switch controls the dilution of oxygen
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.
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