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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
closed at approximately 11,500 feet cabin altitude,
shutting off oxygen flow to the passengers.
The pilot can bypass the solenoid valve
by selecting the OXYGEN CONTROL VALVE
knob to DROP MASK.
DROP MASK Mode
The pilot can supply oxygen to the passengers
at any cabin altitude by placing the OXYGEN
CONTROL VALVE selector to the DROP
MASK position (see Figure 17-8). When this
position is selected, all masks in the cabin to
immediately drop from the cabin overhead.
This mode operates with or without DC power.
When oxygen flow to passengers is not desired,
shut off oxygen flow to passenger masks by
selecting the OXYGEN CONTROL VALVE
knob to the CREW ONLY position at any time,
or the NORM position when below 11,500
feet cabin altitude.
MIC Switches (Left and Right)
The left and right MIC switches are immediately
below and inboard of each control yoke
shaft on the lower instrument tilt panel. There
is one switch for each crewmember. Each switch
has two positions: OXY MASK and HEADSET.
Normally, each switch is set to the HEADSET
position, which selects crew audio input to the
avionics system from the microphones in the
crewmember headset (Figure 17-9).
Selecting a MIC switch to OXY MASK selects
audio input from the microphone in that crew
17-6 510OM-00
CITATION MUSTANG OPERATING MANUAL
Figure 17-9. Mic Switches
oxygen mask, and disables audio input from
that crewmember headset microphone.
Depressing the microphone button on the respective
control wheel allows the crewmember
to transmit through the headset microphone
or through the oxygen mask microphone, as selected
by the respective MIC switch.
When the switch is in the OXY MASK position,
the cockpit speaker turns on and cannot
be turned off using the audio panel button.
OXY CONTROL Circuit Breaker
The OXY CONTROL circuit breaker in the ENVIRO
section of the pilot CB panel protects the
passenger oxygen solenoid valve. Pulling this
circuit breaker disables the spring-loaded solenoid,
which closes the valve.
OXYGEN Pressure Gauge
The OXYGEN pressure gauge (Figure 17-10)
is on the right side of the copilot instrument
panel, below and to the right of the copilot primary
flight display (PFD), and above the OXYGEN
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CITATION MUSTANG OPERATING MANUAL 2(41)
