At what cabin altitude is the passenger oxygen system automatically activated?

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.



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Passengers must be offered oxygen at 15,000 feet. If you are flying at a pressure altitude of 12,500 feet to 13,999 feet, once you hit the thirty-minute mark, you need to put on that oxygen.

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If the cabin altitude reaches a predetermined height (14,000' is standard), or if the system is activated by the flight crew, overhead panels open and oxygen masks drop out. To put the mask on, it is necessary for the intending user to pull it down and this action releases the firing pin and activates the generator.

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Cabin Oxygen System Each container has an electrical latching mechanism that opens automatically to allow the masks to drop, if the cabin pressure altitude exceeds 14,000 ft (+250, -750 ft). Chemical generators produce the oxygen.

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When and How Are Oxygen Masks Released? Oxygen masks release whenever there's a drop in cabin pressure. Sometimes the flight crew might initiate the release. However, it usually triggers automatically when the cabin altitude gets to 14,000 feet.

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For Part 91 General Aviation operations the required flight crew must use supplemental oxygen for any portion of the flight that exceeds 30 minutes above a cabin pressure altitude of 12,500 feet mean sea level (MSL) up to and including 14,000 feet (MSL).

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(ii) Above 15,000 feet MSL, oxygen to each occupant of the aircraft, other than the pilots, for one hour unless, at all times during flight above that altitude, the aircraft can safely descend to 15,000 feet MSL within four minutes, in which case only a 30-minute supply is required.

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The general rule is that planes should have cabin pressurization when they go above 10,000 to 14,000 feet. Can a pilot depressurize a cabin? Most aircraft cabins are pressurized to an altitude of 8,000 feet, called cabin altitude.

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To avoid that, airliners don't try to duplicate the air pressure at sea level. Instead, at a cruising altitude of 36,000 feet (10,973 meters), most commercial jets simulate the air pressure at an elevation of 8,000 feet (2,438 meters), about the same as Aspen, Colorado.

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(1) For flights at cabin pressure altitudes above 10,000 feet, up to and including 14,000 feet, enough oxygen for that part of the flight at those altitudes that is of more than 30 minutes duration, for 10 percent of the passengers.

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When you fly on an airplane, the flight attendant instructs you to “put your oxygen mask on first,” before helping others. Why is this an important rule for ensuring survival? Because if you run out of oxygen yourself, you can't help anyone else with their oxygen mask.

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