The effectiveness of changes in aircraft operating procedures and aircraft hardware regarding the reduction noise near airports were rated by determining the changes in land areas falling within the Noise Exposure Forecast contours. Sets of NEF contours were constructed for two different aircraft types operating from a single runway airport; the number of operations per day was varied from 200 to 1000. The changes included power cutbacks after takeoff, two segment approaches and retrofit of four-engine turbofan aircraft with acoustically-lined nacelles or with a 'quiet engine'. (Author)
Noise Exposure Forecast Contour Interpretations of Aircraft Noise Tradeoff Studies
1969
46 pages
Report
No indication
English
Acoustics , Air Transportation , Airports , Jet plane noise , Reduction , Area coverage , Engine noise , Take-off , Turbofan engines , Engine nacelles , Test methods , Statistical analysis , Tradeoffs , J. F. Kennedy International Airport , Los Angeles International Airport , O'Hare International Airport
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