Aircraft noise is noise pollution produced by any aircraft or its components, during various phases of a flight: on the ground while parked such as auxiliary power units, while taxiing, on run-up from propeller and jet exhaust, during take off, underneath and lateral to departure and arrival paths, over-flying while en route, or during landing

Aircraft noise is noise pollution produced by any aircraft or its components, during various phases of a flight: on the ground while parked such as auxiliary power units, while taxiing, on run-up from propeller and jet exhaust, during take off, underneath and lateral to departure and arrival paths, over-flying while en route, or during landing.

Dr. Ian Waitz's group in aeronautics and astronautics has come up with an idea that could significantly reduce the noise from jet engines by injecting air from the trailing edges of the rotating blades within the engine.To aircraft manufacturers and operators, noise is a problem as serious as emissions. 'It significantly impacts the economics,' said Dr. Waitz, an assistant professor and director of the Aero-Environmental Research Laboratory, which also has a program addressing emissions from aircraft engines. Noise from planes flying over residential areas impairs people's ability to work, learn in school and sleep, and consequently also results in lowered property values in affected areas. As passenger volume increases and new and larger airports are built, noise is becoming even more of a concern.