Abstract
A comparison was made of Version 1.3 of the FAA Integrated Noise Model (INM) and Version 3.4 of the USAF/NOISEMAP computer programs. Those programs are widely used to predict the location of aircraft noise contours around airports and to determine the size of the areas enclosed. Large differences were found in the noise data bases. There were also differences in flight-profile data bases, ground attenuation factor, and in the way the change in noise duration is handled for curved flight paths. The two programs were used to calculate sound exposure level contours produced by individual operations of various air-carrier and general-aviation jets. The programs were also used to calculate contours of cumulative day-night average sound level around a hypothetical average major intercontinental airport (AVPORT). Large differences in contour areas and shapes were found.
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