Abstract
This chapter focuses on the technology for reducing aircraft noise. Aircraft noise can be reduced by engineering measures aimed at the power plant and other aircraft components, by operational measures aimed at modifying the operation of the aircraft so as to reduce noise, and by zoning, insulation and other measures aimed at reducing the impact of noise on its recipients. Turbojet engines powered the first generations of jet aircraft and the current supersonic transports. A very considerable reduction in noise levels has been achieved with the introduction of turbofan engines. In the case of supersonic jets, noise reduction is still very much in an experimental stage. The more recent commercial jet planes have achieved very significant reductions in noise levels. A number of operational procedures can be followed to reduce aircraft noise both in flight and on the ground. Rerouting flight paths away from critical areas. This involves making turns away from densely populated areas, both on landing and takeoff, and the use of preferential runways.
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