Regulators approved up to 45,000' are designed to provide 40% cylinder oxygen and 60% cabin air at lower altitudes, with the ratio changing to 100% at the higher altitude.Regulators approved for use up to 40,000' are designed to provide zero percent cylinder oxygen and 100% cabin air at cabin altitudes of 8,000' or less, with the ratio changing to 100% oxygen and zero percent cabin air at approximately 34,000' cabin altitude.Oxygen requirements are in Federal Aviation Regulation 91.211.At FL410 - each pilot must be on oxygen at all times.At F元50 - if one pilot leaves the cockpit then the other must utilize supplemental oxygen on unless he has a quick donning mask.25,001' to Unlimited - Required to satisfy the above and an additional 10 minutes for each occupant.15,001' to 25,000' - Must be provided for every occupant.14,001' to 15,000' - Required to be provided and used by the required flight crew.12,501' to 14,000' - Required by the required crew if over 30 minutes at this altitude.Sea Level to 12,500' - No oxygen required.Therefore, the required oxygen schedule is:. At 40,000', death will occur in approximately 8 to 12 seconds.Above 15,000', collapse and unconsciousness are not uncommon (hypoxia).Above 10,000', the crew may begin to make errors in judgment, mental alertness diminishes.Therefore oxygen requirements are reference pressure altitude.This decrease in partial pressure prohibits oxygen saturation into the blood.As pressure altitude increases, the partial pressure of oxygen (also known as O 2) decreases.Think you've got a solid understanding of supplemental oxygen? Don't miss the supplemenetal oxygen quiz below, and topic summary.Additional considerations for other operations, including SCUBA diving, also apply.Preventative safety measures further include the wear of a pulse oximeter as well as appropriate preflight and servicing procedures.Given that oxygen can be a hazardous chemical in the aviation environment, safety precautions must be taken when using and maintaining oxygen systems.Various types of aircraft oxygen system designs and oxygen delivery systems utilizing a variety of components are available.Aircraft designed to operate at low altitudes will normally have a portable oxygen system.Aircraft designed to operate at higher altitudes will normally have an oxygen generation system.Operations at higher altitudes will drive the requirement for supplemental oxygen.Supplemental oxygen provides pilot's operating at high altitudes to counteract the effect of decreasing pressure, particularly hypoxia.
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