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regulator’s high pressure burst disk
The overboard discharge port is covered by a overboard
discharge disk. See Figure 3. In addition to preventing
contaminants from entering the overboard discharge line, the
disk serves as a visual indicator to the flight crew that an
overboard discharge has occurred, by being blown out and
off the discharge port. It is green in color and labeled OXY.
H.P. RELIEF.
(2) Airplanes SN 1290 and Subsequent:
(See Figure 2.)
Each of the three oxygen cylinders (one crew and two passenger) is
constructed as a seamless aluminum liner with a filament overwrap
of Kevlar. Each cylinder is normally pressurized to 1800 psi at 70° F
(21° C). The observed pressure reading when fully serviced varies
with temperature, however, and may fall in a range between 1,485
psi at 0° F (-18° C) to 2015 psi at 120° F (49° C). All three cylinders
are installed underneath the forward cabin floor. The two passenger
cylinders each have a gaseous capacity of 115 cubic feet (3,257
liters) and are installed side by side in the area approximately
between the first set of cabin windows. The crew cylinder has a
gaseous capacity of 50 cubic feet (1,416 liters) and is installed just
aft of the passenger cylinders. Provisions exist for an optional
second crew cylinder to be installed beside the standard crew
cylinder if selected by the operator during outfitting.
A regulator assembly is attached to the neck of each cylinder. The
primary function of the regulator is to reduce high cylinder pressure
to a nominal delivery pressure of approximately 70 psi. A manual
ON/OFF knob is installed on each regulator to allow or inhibit
oxygen flow directly from that cylinder. These knobs are accessible
from the cabin through access panels cut into the floorboard.
In addition to controlling oxygen supply and its delivery pressure,
each regulator assembly provides ports for the following
connections:
(a) Oxygen Cylinder Direct Reading Gauge:
A direct reading gauge is installed on each oxygen cylinder
regulator in order to obtain oxygen cylinder pressure directly
from the cylinder.
OPERATING MANUAL
PRODUCTION AIRCRAFT SYSTEMS 2A-35-00
Page 3
May 30/02
Revision 7
(b) Supply Lines:
A supply line exits each passenger cylinder pressure
regulator, later joining to form a common passenger supply
line. A check valve is installed on each passenger cylinder
supply line (before joining occurs) to prevent system
backflow. The common passenger supply line routes oxygen
to the oxygen control panel where flow can be controlled by
the panel’s ON/OFF toggle switch. When the toggle switch is
selected ON, flow is routed through a common supply line
that is subsequently divided into two lines. One line delivers
oxygen to the passenger oxygen control panel, where it may
be further distributed to the left and right side passenger
masks. The other line connects to the crew oxygen supply
line downstream of the CREW OXYGEN ON/OFF toggle
switch. This line enables the passenger oxygen system to
deliver oxygen to the crew oxygen system. A check valve
installed on this line prevents crew oxygen flow into the
passenger oxygen system.
Provisions also exist for the passenger cylinder supply line to
deliver oxygen to therapeutic oxygen outlets, when such
optional outlets are installed.
A supply line exiting the crew cylinder pressure regulator
routes oxygen to the oxygen control panel where flow can be
controlled by the panel’s ON/OFF toggle valve switch. When
the switch is selected ON, flow is routed to the three crew
mask/regulator assemblies. A check valve is installed on the
supply line to prevent system backflow.
A pressure switch is installed between each cylinder pressure
regulator and check valve to monitor supply line pressure. If
the switch senses a line pressure below approximately 50
psi, a discrete is sent to DAU #1. DAU #1 in turn causes CAS
to display an amber CREW OXYGEN OFF and/or PAX
OXYGEN OFF caution message. The purpose of these
messages is to caution the flight crew that the oxygen
cylinder may have been manually shut off at the cylinder.
(c) Fill Lines:
Fill lines are installed to transfer oxygen from an external
source connected to the oxygen servicing panel (left forward
nose section) to the oxygen cylinders via the regulator
assemblies. The passenger oxygen system fill line begins as
a single line at the servicing panel. The line is then divided
into a dedicated line for each passenger cylinder. The crew
oxygen system uses a single fill line dedicated to the crew
　
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