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The oxygen generators are activated when any mask in the unit is pulled down.
Pulling one mask down causes all masks in that unit to come down and 100%
oxygen flows to all masks. A green in-line flow indicator is visible in the
transparent oxygen hose whenever oxygen is flowing to the mask. Oxygen
flows for approximately 12 minutes and cannot be shut off. If the passenger
oxygen is activated, and a PSU oxygen mask compartment does not open, the
masks may be dropped manually.
PSU OXYGEN MASK COMPONENTS
AIRCRAFT GENERAL
Sec. 6.1 Page 78 737
Rev. 11/15/02 #41 Continental Flight Manual
FLIGHT CREW OXYGEN
The flight crew oxygen system is completely separate from the passenger
oxygen system. It uses quick-donning diluter demand mask / regulators located
at each crew station. Oxygen is supplied by a single cylinder. Pressure is read
on the indicator located on the aft overhead panel when the Battery Switch is
ON. Oxygen flow is controlled through a pressure-reducing regulator to supply
low-pressure oxygen to a shut-off valve located behind the First Officer’s seat.
Normal pressure is 1850 psi. See Limitations Section 1 for minimum dispatch
requirements.
The mask / regulator is stored in a box immediately adjacent to each crew
station. To use the mask, squeeze the red release levers with the thumb and
forefinger and remove from stowage. Squeezing the release levers inflates the
mask harness. The flow indicator will show a yellow cross momentarily as the
harness inflates. Place the mask over the head and release the levers. The
harness will contract to fit the mask to the head and face.
Oxygen flow is controlled by a regulator that is mounted on the oxygen mask.
The regulator may be adjusted to supply 100% oxygen by pushing the
NORMAL/100% selector. An emergency control knob labeled EMERGENCY below
the chin of the mask, changes the flow from a diluter demand to steady flow if it
is rotated to the EMERGENCY position. The emergency knob is also marked
PRESS TO TEST. When pressed it allows oxygen to flow into the mask and is
used in conjunction with the RESET - TEST lever for mask testing in the box.
The observer oxygen mask, regulator, and harness unit is the same as the
pilots’. Oxygen is available to the regulator when the flight deck shut-off valve
is open. There is no flow indicator or reset-test lever. The mask, regulator and
harness are contained in a stowage cup.
MASK DESCRIPTION
Flight crew stations are provided with combination oxygen mask and regulator
that is stored in a special compartment in the sidewall of the aircraft. This
location is designed to enable the crew to don the mask quickly with only one
hand. All controls for operation of the mask are located at the base of the unit.
The harness is pneumatically inflated for quick donning. After the mask has
been donned, the elastic of the harness form fits the mask to the face. A
microphone is contained in the mask.
AIRCRAFT GENERAL
737 Sec. 6.1 Page 79
Flight Manual Continental Rev. 11/15/02 #41
OXYGEN SYSTEM SCHEMATIC
AIRCRAFT GENERAL
Sec. 6.1 Page 80 737
Rev. 11/15/02 #41 Continental Flight Manual
PASSENGER PORTABLE OXYGEN
First aid and sustaining portable oxygen cylinders are installed at suitable
locations in the passenger cabin. The cylinders are fitted with a pressure gauge,
pressure regulator, and on-off valve. The cylinders are pressurized to 1800 psi.
At this pressure, and a temperature of 70ºF (21ºC), the cylinders have a capacity
of 4.25 cubic feet (120 liters) of free oxygen. Two continuous flow outlets are
provided on each cylinder: one regulates flow at two liters per minute for walkaround;
the second outlet provides flow at four liters per minute for first aid.
Duration can be determined by dividing capacity by outflow. (120 liters divided
by 4 liters/min = 30 min.)
OXYGEN SYSTEM SCHEMATIC
AIRCRAFT GENERAL
737 Sec. 6.1 Page 81
Flight Manual Continental Rev. 11/15/02 #41
> FLIGHT CREW PORTABLE OXYGEN
The flight crew portable oxygen unit is a completely self-contained oxygen
system, offering both demand and constant flow capabilities. It consists of a
portable oxygen cylinder, a pressure regulator (constant flow), an on-off valve, a
pressure gauge to show oxygen supply, a demand regulator, and a sling-type
carrying strap.
The portable oxygen cylinder is installed behind, and adjacent to, the First
Officer’s seat. When charged to 1800 psi at 70ºF (21ºC), it contains 11 cubic
feet (311 liters) of free oxygen.
The demand regulator has a connection for a demand type, full-face mask, and
supplies 100% oxygen. Normally, the full-face mask is attached to the unit and
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