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event that cylinder pressure reaches 2700 to 3000 psi (18,617 to 20,685
kPa). Should the cylinder contents be discharged overboard, the green
overboard discharge indicator, on the outside surface of the aircraft
near the storage cylinder, will be ruptured or missing.
6-14
PM-121
Change 3
Learjet 31A
Pilot's Manual
CREW
MASK
OXYGEN SYSTEM SCHEMATIC
Figure 6-5
PM-121
6-15
Original
Pilot's Manual
Learjet 31A
OXYGEN PRESSURE GAGE
The oxygen pressure gage is located on the pilot's sidewall . The gage
is calibrated from 0 to 2000 psi. The gage is a direct-reading type that
is plumbed to the high-pressure side of the regulator and indicates
oxygen cylinder pressure only.
OXYGEN SYSTEM COCKPIT CONTROLS
The oxygen system cockpit controls consist of one control valve, labeled
PASSENGER OXYGEN OFF-AUTO-DEPLOY, located on the
pilot's sidewall above the armrest. The control valve controls oxygen
availability to the passenger oxygen distribution system and provides
automatic or manual mode selection. Oxygen is available to the crew
oxygen distribution system at all times when the oxygen cylinder
shutoff valve is open. Control positions and system functions are as
follows:
1 . With the PASSENGER OXYGEN valve in the AUTO position,
oxygen is available to the passenger distribution system and the
aneroid-controlled solenoid valve will deploy the masks automatically.
Should the cabin altitude reach 14,000 (±750) feet, the
aneroid switch will open the solenoid valve, the passenger oxygen
masks will deploy, and the upper center panel lights will illuminate
to provide maximum visibility for donning masks.
Normally, the control should be in this position.
2. With the PASSENGER OXYGEN valve in the DEPLOY position,
oxygen is available to the passenger distribution system and the
passenger masks will deploy. The solenoid valve will be bypassed
and allow oxygen system pressure to deploy the passenger
masks. This position can be used to deploy the passenger
masks at any cabin altitude and must be used if electrical power
is unavailable.
3. With thePASSENGEROXYGEN valve in the OFF position, oxygen
is not available to the passenger distribution system regardless
of cabin altitude. This position can be used when oxygen is
required for the crew only.
6-16
PM-121
Original
Learjet 31A
Pilot's Manual
PASSENGER MASKS
Passenger oxygen masks are stowed in compartments in the cabin
ceiling upper-center panel. Whenever the compartment doors open
automatically (PASSENGER OXYGENAUTO) or manually (PASSENGER
OXYGENDEPLOY), oxygen is available for passenger use.
Passengers should don masks and must pull lanyard to initiate oxygen
flow. An orifice is incorporated in the mask to provide a constant
flow of 4.1 liters per minute. The rebreather bag will inflate at a seemingly
slow rate when oxygen is flowing. This is normal. Should the
compartment door be inadvertently opened from the cockpit, pressure
must be bled from the system by pulling one of the lanyards before
the masks can be restowed. The compartment doors can be
opened manually for mask cleaning and servicing by releasing the
latch labeled OXYGEN adjacent to each door. When the doors are
opened using this method, no oxygen flow is available to the masks.
PASSENGERMASK
Figure 6-6
PM-121
6-17
Original
Pilot's Manual
Learjet 31A
CREW MASKS
The standard (6600214 series) flight crew masks are stowed on straps
behind the pilot's and copilot's seats. Optional (Scott ATO MC 10-15-
01) flight crew masks, stowed in accessible storage receptacles on the
pilot's and copilot's sidewalls, may replace the standard crew masks.
The pressure demand mask regulators provide for normal, 1009/6 oxygen
and emergency operation (refer to the FAA Approved Airplane
Flight Manual for detailed operational procedures). Each mask incorporates
a microphone controlled by the MiCSELECT switch on the audio
control panels. An electrical cord extends from each mask and is
plugged into the OXYMICjack on the jack panel. Communication between
crew members can be accomplished by using theOXYfunction
of the MIC SELECT switch on the audio control panels.Apressure detector
is installed in each mask oxygen supply line to show visible verification
of oxygen pressure to the mask. A quick-disconnect is
provided for each crew member. When the mask bayonet is inserted
into the quick-disconnect, a spring loaded poppet movesoffits seat and
allows oxygen flow into the mask supply line.
CREW MASK -6600214 SERIES
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