The aircraft engine manufacturer has been continually confronted with the factor of noise control in conjunction with the development and production testing of engines. The scope of this control activity has increased many fold during recent years as the result of the rapid growth in types and size of military powerplants. Presented in this paper is a review of the over-all effort including typical noise sources, control objectives, recent techniques used in the control and attenuation of aircraft powerplant noise, problems associated with the design of noise control provisions, and limitations in the existing methods. This review includes data on reciprocating, turbojet, turboprop, and ram jet powerplants, along with a description of installations used for controlling the noise both in ducted exhaust systems and in propeller-type test cells. The discussion cites cost, space, and high tolerance in design factors as being the major problems. Areas of continued endeavor are outlined for the engine manufacturer, acoustical consultant, and the noise control equipment manufacturer.