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OXYGEN CONTROL
VALVE SELECTOR
CREW ONLY
DROP MASK
BOTTLE PRESSURE
LEGEND
REGULATED CREW OXYGEN
(AVAILABLE TO CREW AT ALL TIMES)
REGULATED PASSENGER OXYGEN
(CONTROLLED BY OXYGEN CONTROL VALVE)
OXYGEN GAUGE
Figure 17-1. Oxygen System Schematic
OXYGEN SYSTEM
DESCRIPTION
The Mustang oxygen system is primarily for
emergency use, but also allows limited-duration
nonemergency use. It provides breathable
low-pressure oxygen (at approximately
70 psi) to crew and passengers through individual
oxygen masks.
The system uses a single bottle of compressed
oxygen to supply both crew masks and passenger
masks. A regulator controls overall system
pressure, and a shutoff valve (controlled by an
oxygen supply valve labeled OXYGEN SUPPLY
in the cockpit) enables or disables the system.
Another cockpit control labeled OXYGEN
CONTROL VALVE selects distribution modes.
An oxygen gauge indicates the pressure (and indirectly,
volume) of oxygen in the bottle. A crew
alerting system (CAS) message indicates when
insufficient oxygen is available. If oxygen supply
is shut off or if pressure in the system is too
low, an amber OXYGEN OFF message appears.
Individual controls on crew masks adjust their
oxygen flow.
COMPONENTS
The system includes:
• Oxygen bottle (with integral shutoff
valve and pressure regulator)
• Oxygen masks (crew and passenger)
• Oxygen control valve
Oxygen Bottle
A single bottle holds all compressed oxygen
for the system. It is on the right side of the nose
storage compartment and has a 623-liter (22-
cubic-feet) useable capacity with 1,133-liter
(40-cubic-feet) option. Oxygen is stored in
the bottle at a pressure between 1,600 and
1,800 psig.
A shutoff valve and pressure regulator on the
bottle control the flow of oxygen to the distribution
system (Figure 17-1). The regulator
reduces oxygen system pressure to 70 psi
downstream of the bottle. The shutoff valve on
the bottle is normally open in flight. It is mechanically
controlled in the cockpit by the
OXYGEN SUPPLY control knob.
Crew Oxygen Masks
Each crewmember is supplied with a quickdonning
mask with a built-in microphone and
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
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