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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
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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
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
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Figure 17-10. Oxygen Pressure Gauge Figure 17-11. Overboard Discharge
Indicator
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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
　
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