Emergency oxygen system
0Emergency oxygen system, by Wikipedia https://en.wikipedia.org/wiki?curid=10039375 / CC BY SA 3.0
#Aircraft_emergency_systems
Oxygen masks dropping Aircraft emergency oxygen systems or air masks are emergency equipment fitted to pressurized commercial aircraft, intended for use when the cabin pressurisation system has failed and the cabin altitude has climbed above a safe level.
It consists of a number of individual yellow oxygen masks stored in compartments near passenger seats and near areas like lavatories and galleys, and an oxygen source, like a centralized gaseous cylinder or decentralized chemical oxygen generator.
Most commercial aircraft that operate at high flight altitudes are pressurized at a maximum cabin altitude of approximately 8,000 feet.
On most pressurized aircraft, if cabin pressurization is lost when the aircraft is flying at an altitude above 4.
267 m （14,000 feet）, compartments containing the oxygen masks will open automatically, either above or in front of the passenger and crew seats, and the oxygen masks will drop down in front of the passenger.
Oxygen masks may also drop on extremely rough landings or during severe turbulence if the oxygen mask panel becomes loose.
Rows of seats typically have an extra mask （e.g. 3 seats, 4 masks）, in case someone has an infant in their lap, or someone in the aisle needs one.
An oxygen mask consists of a yellow, soft, silicone facial cup with white elastic bands for securing the mask to the passenger's face.
This band is adjustable by pulling two ends looped through the facial cup.
The mask may also have a concentrator or re-breather bag that may or may not inflate depending on the cabin altitude, which has （in some instances） made passengers nervous the mask was not providing adequate oxygen,
causing some to remove them, who thereby suffered hypoxia.
All airlines now make a point in the safety video or demonstration to point out that the bag may not inflate.
The bag is attached to a tube, connected to th...
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