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..
Fastest aircraft, fastest jet, fastest airplane, fastest plane, fastest jet plane, fastest airplane in the world, fastest aircraft in the world, fastest jet aircraft, fastest rc jet, and other fastest airplanes, speed records, and a guide to the fastest radio control airplanes.43A Scramjet fastest airplane - 7,500 mph. It is the world's fastest air breathing engine vehicle and is pilotless. The record was set on 11/16/2004 when the X-43A was launched by a booster rocket at 40,000 feet from a B-52.