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regulator (Figure 17-2). Each oxygen mask is
stowed immediately outboard and aft of each
crewmember in a container above the outboard
shoulder of each crewmember (Figure
17-3) and is equipped with an inline flow indicator
(Figure 17-4). A flow indicator indicates
to the crew that oxygen is received.
The mask is quick-donning by pressing the
red sides of the nosepiece, which causes the
harness to inflate and easily slip over the head.
The mask is a diluter/pressure-demand type
with 100% oxygen provided by pushing a
lever/tab on the bottom-right corner of the
mask to the 100% position.
510OM-00 17-3
CITATION MUSTANG OPERATING MANUAL
Figure 17-2. Standard Crew Masks
To qualify as a quick-donning mask, the crew
oxygen mask must be properly stowed in the
receptacle behind, above, and outboard of
each crewmember on the forward cabin divider,
and must be set to 100%.
NOTE
Headsets, eyeglasses, or hats worn by
the crew will interfere with the
quick-donning capability of the oxygen
masks.
The crew masks plug into OXYGEN MASK
receptacles on the pilot and copilot side consoles
(Figure 17-5). The mask oxygen line
plugs into the large valve port, and the mask
microphone plugs into the MIC jack, both of
which are under the OXYGEN MASK section
of the console. Ensure both plugs are fully
inserted before flight.
If the aircraft is to be parked outside and the
temperature is colder than 0°C, the masks must
be removed from the aircraft and kept warm.
17-4 510OM-00
CITATION MUSTANG OPERATING MANUAL
Figure 17-3. Crew Oxygen Mask,
Stowed (Pilot Side)
Figure 17-4. Flow Indicator
PILOT CONSOLE
COPILOT CONSOLE
Figure 17-5. Pilot and Copilot Consoles
510OM-00 17-5
CITATION MUSTANG OPERATING MANUAL
Passenger Oxygen Masks
In the cabin, passenger masks are in overhead
containers and drop automatically or manually
(Figure 17-6). A lanyard attached to the mask
aids in pulling the mask down if it does not
drop clear of the box.
A short lanyard physically connects the mask
to a pin in a valve inside the overhead oxygen
line. Pulling this lanyard pulls out the pin
to start the oxygen flow to the mask. The act
of lowering the oxygen mask to the face also
pulls free the lanyard and pin, enabling oxygen
to flow. Passenger masks have no flow
indicator.
CONTROLS AND INDICATIONS
OXYGEN CUTOFF Knob
The OXYGEN CUTOFF cutoff knob is on the
lower-right corner of the instrument panel,
below the OXYGEN pressure gauge (Figure
17-7). It closes the regulator at the bottle for
delivery of oxygen to the crew and passengers.
When the OXYGEN SUPPLY knob is placed
in the CUTOFF position, line pressure is
vented overboard.
OXYGEN CONTROL VALVE
Knob
The OXYGEN CONTROL VALVE knob is on
the far left edge of the instrument panel (Figure
17-8). It controls oxygen flow to the passenger
cabin. Its three positions actuate a control
Figure 17-7. OXYGEN CUTOFF Knob
Figure 17-8. Oxygen Control Valve Knob
Figure 17-6. Passenger Oxygen Mask
valve for passenger oxygen distribution as desired.
The knob positions are:
• CREW ONLY
• NORMAL
• DROP MASK
CREW ONLY Mode
When the control knob of the oxygen control
valve is placed in the CREW ONLY position,
oxygen is not available to the passengers. In this
position, oxygen is only available to the crew.
After donning the mask, the crew must set the
lever under each mask to NORMAL or 100%.
For pressure breathing, rotate the mask emergency
select knob to EMERGENCY.
NOTE
Oxygen masks are certified to 40,000
feet cabin altitude for the crew only.
The CREW ONLY mode operates
with or without DC power.
NORMAL Mode
When the oxygen system is enabled, if the
OXYGEN CONTROL VALVE knob is selected
to the NORMAL position (see Figure 17-8),
passenger oxygen masks automatically drop
down from the cabin ceiling anytime cabin
pressure altitude is greater than 14,800 feet.
Normally, the pressurization system maintains
an 8,000-foot cabin altitude up to the
maximum certified altitude. However, if cabin
altitude exceeds approximately 14,800 feet, a
cabin-altitude sensor energizes the passenger
oxygen solenoid valve open. Oxygen flows
into the passenger distribution system and releases
latches on the mask compartment doors.
This allows the doors to open and the masks
to fall out.
After restoration of the cabin pressure to normal
values, the solenoid valve deenergizes
　
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