PULSE OXIMETER

摘要

THE CABINS OF MOST PISTON AIRPLANES are not pressurized. No conditioned air is pumped into the airplane to create a safe and comfortable environment for you and your flight instructor, or your passengers. Therefore, when you fly above certain altitudes where the air becomes thinner, you may need supplemental oxygen. Part 91 of the federal aviation regulations stipulates required flight crew (that's you) must use supplemental oxygen for any portion of a flight that exceeds 30 minutes above a cabin pressure altitude of 12,500 feet mean sea level, up to and including 14,000 feet msl. The flight crew must use supplemental oxygen for the entire duration of flight operations above a cabin pressure altitude of 14,000 feet msl. The FAA recommends using supplemental oxygen whenever you're flying above 10,000 feet msl.