PROCEDURES FOR DEVELOPING NOISE EXPOSURE FORECAST AREAS FOR AIRCRAFT FLIGHT OPERATIONS.

Abstract : The report outlines procedures and supporting technical data for determining Noise Exposure Forecast (NEF) area, resulting from takeoff and landing operations in the vicinity of airports. In companion reports, these procedures have been applied to determine NEF areas in the vicinity of J. F. Kennedy, O'Hare and Los Angeles International Airports for 1965, 1970 and 1975. The NEF areas have differing land use compatibility with respect to aircraft noise; hence, the NEF areas may be used as a guide to land use planning and zoning. The NEF areas are based upon the aircraft noise described in terms of the effective perceived noise levels (which includes corrections for duration and presence of discrete frequencies) plus adjustments for the number of operations for daytime and nighttime periods. Noise and takeoff and landing profile information is given for estimating effective perceived noise levels for the takeoff and landings of current large jet aircraft and for future large aircraft expected to be in operation within the forecast periods. Computer-aided procedures employed in determining NEF contours are also outlined.