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From page 15...
... 15 C H A P T E R 2 2.1 Sound Insulation History In 1981 the FAA issued interim Federal Aviation Regulation, Part 150, Airport Noise Compatibility Planning, as the primary regulation guiding and controlling planning for aviation noise around airports (Federal Register Notice 46 FR 8316)
From page 16...
... 16 Evaluating Methods for Determining Interior Noise Levels Used in Airport Sound Insulation Programs amended]
From page 17...
... Project Background and Study Scope 17 noise environment not greater than 45 dB. The 5 dB improvement was always the primary criterion, since it almost always guaranteed compliance with the 45 dB criterion, and because the allowable noise retrofit treatments seldom resulted in NLR improvements much above 5 dB.

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