General aviation requirements for the national aviation system of the 1970's include the use of airspace and airports under all conditions by the various kinds of users, not just those aircraft operating within the IFR system.Unconstrained demand in the airspace and at airports must be met without undue economic or regulatory burden. A nationwide system of general aviation airports is required, with satellite airports in major metropolitan areas and general aviation runways on major airports. Instrument approach capability is needed down to reasonable minimums through specific aids and/or area navigation. A modernized flight service program is required including improved weather reporting, forecasting, dissemination and communications for general aviation. Safety corridors are needed to segregate high performance traffic in terminal areas. Development is needed in the field of collision prevention to enhance conspicuity, improve cockpit visibility and develop a low cost proximity warning device.