NEAR TR 73 (August, 1974) reported on several studies of various methods for reducing aircraft noise in the vicinity of airports. This report gives the results of further studies of noise reduction methods. As was the case in NEAR TR 73, a simplified method of analysis was used in which all flights at a "simulated" airport were assumed to operate from one runway in a single direction. For this simulated airport, contours of Noise Exposure Forecast were obtained and evaluated.nFour studies are reported here. All four use the "23-Airport Average" flight schedule which was developed in the earlier study. The use of this flight schedule results in a "simulated" airport which is representative of the 23 major U. S. airports.
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