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� ` <br /> � . . <br /> � R22 - LOW NOISE LEVEL <br /> ; . <br /> The R22 Beta is the quietest production helicopter available. The aircraft's low noise <br />�� <br /> level has been achieved by instailat�on of a heavy duty muffler and low taii rotor tip • <br /> speed. In addition to low external noise, the aircraft is also surprisingly quiet internally <br />� due to thick acoustical foam installed between the cockpit and the powerplant/drive <br /> system installation. <br />� In 1974, noise evaluation tests were conducted with the R22 helicopter by the Scientific <br /> Services Branch of the Greater London Council (GLC) in the United IGngdom as one <br />� of the final �steps for Transport Category Certification of the R22 by the Civil Aviation <br /> Authority there. The technical team in charge of tha tests reported that the Robinson <br /> • R22 was the quietest helicopter ever tested by the GLC, whose noise standard requires <br />��' that helicopters must demonstrate noise leve(s equal to or less than 81 dB(A). The <br /> R22's test results revealed that its maximum noise fevel was only 72 d8 A , well below <br /> the established criteria. GLC evaluation tests generally require a minimum of nine <br />� events (take-offs and landings), however, �Jlr. S.J. Fisher, Head for the Scientific <br /> Services Branch at that time, requested the test pilot to fly only four events since it was <br /> clear that the R22 was easily meeting the noise standard. <br />� During the Summer of 1985, noise tssts w <br /> ere conducted �ointly by the U.S. FAA and <br /> the Helicopte� Association International at Dulles Airport in Washington, D.C. using eight <br />� of the most mode�n helicopter types. The aircra�t tested ran � <br /> g..d in size from the <br /> Robinson R22 to the Sikorsky S-76. E�ctensive data was taken for. a variety of flight <br /> conditions, and the R22 was the quietest of the helicopters tested. Of particular interest <br />� was the fly-over data which demonstrated that the R22 was quieter when flying over <br /> a populated area at 500 feet than any of the other helicopters test,e'd were when flying <br />� over the same area at 1000 feet. <br />