737 Flight Crew Operations Manual
Airplane General, Emergency
Equipment, Doors, Windows -
Systems Description
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1.40.26 D6-27370-866-EGP
WARNING: Do not use passenger oxygen with cabin altitude below 14,000
feet when smoke or an abnormal heat source is present. The
use of passenger oxygen does not prevent the passengers from
inhaling smoke. Air inhaled is a mixture of oxygen and cabin
air.
Passenger Portable Oxygen
First aid and supplemental 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 70 degrees Fahrenheit, (21 degrees Celsius) the
cylinders have a capacity of 11 cubic feet (311 liters) of free oxygen. Two
continuous flow outlets are provided on each cylinder, one regulates flow at two
liters per minute for walk–around; the second outlet provides flow at four liters per
minute. The four–liter flow is used for first aid.
Duration can be determined by dividing capacity by outflow (120 liters divided by
4 liters/minute = 30 minutes).
September 15, 2016
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