What is the oxygen requirement for an unpressurized aircraft at 15000 feet?

These requirements are the following: 12,500 FT MSL to 14,001 FT MSL (for more than 30 minutes): Crew must be on oxygen. 14,000 FT MSL to 15,000 FT MSL: All crew must be on oxygen. Above 15,000 FT MSL: Oxygen must also be provided to passengers but they are not required to use it.



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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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For operations conducted under Parts 121 and 135, the flight crew must use oxygen when cabin altitudes are above 10,000 up to 12,000 feet after 30 minutes and at all times when above 12,000 feet. The general aviation pilot flying an unpressurized airplane will not normally operate above 25,000 feet.

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The required two hours supply is that quantity of oxygen necessary for a constant rate of descent from the airplane's maximum certificated operating altitude to 10,000 feet in ten minutes and followed by 110 minutes at 10,000 feet.

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Airliners can still fly with holes in them, so even if pressurization plays a part in structural integrity, it's not a necessary part.

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The most common reason is that there are no airstrips or airports on many of the small islands, so if a plane had to make an emergency landing, it would be difficult to find a place to land. Additionally, the Pacific Ocean is vast and remote, so if a plane were to go down, it would be very difficult to find.

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If airplanes didn't pressurize their cabins, it could lead to insufficient oxygen as well as related medical problems like hypoxia. Airplanes need pressurized cabins because it ensures passengers, as well as crew members, receive an adequate amount of oxygen in the air they breathe.

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