Manufacturers of airplanes and of aircraft engines have developed, tested, and put into service various concepts and systems to reduce the noise produced by commercial jet transports. The effect of incorporating these concepts and systems has been to alleviate the noise exposure of people living near aircraft flight paths as well as the exposure of passengers and crew members. This paper describes theacoustical treatment used in the engine nacelles on DC-10 airplanes. The special acoustical featuresof the cabin sidewall insulation and the airplane's interior panels are also described. Results of incorporating these various noise-control features are given in terms of flyover noise levels during takeoff and landing and in terms of cabin noise levels during cruise.
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