In the preamble to the final Respiratory Protection Standard, OSHA discussed extensively its rationale for requiring that employees breathe air consisting of at least 19.5 percent oxygen. The following excerpt, taken from the preamble, explains the basis for this requirement: Human beings must breathe oxygen . . . to survive, and begin to suffer adverse health effects when the oxygen level of their breathing air drops below [19.5 percent oxygen].
- The Tu-144 supersonic transport was the fastest commercial jet plane at Mach 2.35 (1,555 mph, 2,503 km/h). It went into service in 1975, but soon stopped flying. The Mach 2 Concorde aircraft entered service in 1976 and flew for 27 years..
Speed varies from plane to plane but average speed of a plane is five hundred and eighty miles per hour. Jet airlines can fly at the speed of 600 mph. And some others can go at the 2000 mph.It depends from aircraft to aircraft.Small jet planes can travel faster than the large passenger jet planes.The take-off speed varies for every aircraft.The speed of planes depends on its designing, load, height above sea level, temperature and winds. Most jet airplanes take-off at the speed of 150 to 180 miles per hour.he take-off speed varies for every aircraft. The speed of planes depends on its designing, load, height above sea level, temperature and winds. Most jet airplanes take-off at the speed of 150 to 180 miles per hour.