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..
Because of their lower weight compared to engine power, some private jets travel faster than large passenger jet planes. 500 to 700mph It depends on the airplane. A Piper Archer will do about 135mph, a King Air will do around 300, an airliner like a 757 will go about 600, jet fighters will go about 1200 for real short distances and an SR-71 will go about 1800.