As turbofans become quieter, landing gear, high-lift systems and other airframe features are emerging as the dominant contributors to aircraft noise on the approach to airports.  NASA is flight-testing landing-gear treatments and trailing-edge flap designs that promise significant reductions in airframe noise. The tests involve back-to-back acoustic measurements with modified and unmodified Gulf-stream III testbeds.  The trials by NASA Armstrong Flight Research Center over the ...

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