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... 4 ACRP's RFP for Project 02-48 cited a general lack of understanding of the relationship between helicopter noise and community response and that in 2004, an FAA Report to Congress, "Nonmilitary Helicopter Urban Noise Study," recommended that "additional development of models for characterizing the human response to helicopter noise should be pursued." The solicitation raised the question of whether the assumed "excess" annoyance of helicopter noise was more usefully attributed to purely acoustic factors, or to nonacoustic factors, or to a combination of the two. This report presents the findings of a social survey on the annoyance of aircraft noise that was intended to seek evidence of the reasonableness of the underlying assumption of the RFP.

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