Under NASA's Fixed Wing and En-vironmentally Responsible Aviation (ERA) projects, finding a way to reduce airframe noise during an aircraft's landing approach has remained an important area of research. During both takeoff and landing, the engines of modern commercial planes are much quieter than those of previous aircraft generations. This is helping to reduce the noise burden on communities in and around airports. But reductions in airframe noise have not kept pace. Today, it is well known in the industry that airframe noise is comparable to or even louder than engine noise during aircraft approaches to landing. As a result, communities under the glidepaths to runways at major airports must still endure noise levels much higher than they-and NASA-would like.
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