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Pages 8-11

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From page 8...
... 8 ANNOYANCE The adverse impact of aircraft noise is usually expressed in terms of annoyance (that is, a subjective response to a particular sound)
From page 9...
... 9 FAA's review of the technical literature on the annoyance of helicopter noise in its Nonmilitary Helicopter Urban Noise Study (FAA 2004) cites eight (mostly laboratory)
From page 10...
... 10 times as great as the rate of notice of fixed-wing aircraft noise." They speculate that the greater rate of notice of helicopter noise was due to the "distinct sound character" of rotary-wing aircraft. Because the participants were exposed to notably fewer helicopter than fixed-wing overflights, it is also possible that they were less habituated to helicopter noise than to fixed-wing aircraft noise.
From page 11...
... 11 number of complaints and total number of complainers. A recent report identifies interesting patterns in complaints that appear to be common to all airports and that is that for nonprolific complainers there is a fixed ratio of the number of people who complain once, versus twice, three times, etc.

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