This paper discusses the influence of thrust reduction of take-off and climb operation on aircraft noise around airport. Currently, it is known that airline and pilots use some method of aircraft engine thrust reduction during takeoff and climb operations, for reasons of environmental and economic profits. Because of these operation method, it is supposed that current situation of aircraft noise and altitude profiles are changing compared to past of them. Analyzing the results of the long-term measurement of aircraft noise and altitude profiles at Narita airport in Japan and comparing the past measurements with the present measurements are carried out to confirm the effects of aircraft thrust reduction. Furthermore, since the amount of thrust reduction is determined by takeoff weight, temperature, wind, runway condition and runway length, the influences of these variables were also examined. Finally, it is discussed how much this thrust reduction affects the airport noise prediction.
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