A survey of noise emission reduction techniques is presented for propeller driven aircraft. Most of the audible noise is generated by the propeller tip traveling with a local velocity near that of the speed of sound. The feasibility of mechanical design steps (larger geared propeller and longer landing gear) required to reduce this speed was investigated. It was found that only new aircraft designs can be so configured. Existing aircraft will continue to operate. The attrition rate of these existing aircraft (1%–3% per year) is small, so that certain operational methods are desirable to achieve quieter airport environs. Procedures of administrative control, operational rules, a noise abatement power adjustments are described which decrease the noise exposure experienced on the ground. Enlightened land planning by county and state officials is described. [Work supported by FAA.]