Helicopter Noise Information for Airports and Communities (2016) / Chapter Skim
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Pages 5-7
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5 Helicopters are unique aircraft in terms of how they fly and how they are used. Because they can lift off and land vertically they do not need a long runway for takeoff and landing.
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6 has the same physical origins as the main rotor and can be a notable noise source with its radiation pattern rotated by 90 degrees. Broadband emissions of rotary-wing aircraft are typically greater on the side of the aircraft.
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7 FAA also licenses pilots; there are a relatively small number of licensed helicopter pilots compared with fixed-wing pilots (in 2011, 37,000 helicopter pilots out of a total of 619,000 pilots, including commercial aircraft pilots: http://www.aopa.org/About-AOPA/General-AviationStatistics/FAA-Certificated-Pilots)
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