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An Enhanced Vision System (EVS) displays sensor derived information to the pilot, usually on a Head Up Display (HUD). The use of at least one on-board sensor would allow the pilot to visualize the runway environment when conventional flight visibility would not permit this. The components of the system are integrated in a way that takes into account the specific task to be accomplished and the associated human factors. The technology for EVS appears to be available. There is a potential for EVS to provide added situational awareness for flight crews. One challenge is to determine whether EVS can be economically justified. However, its potential for improving situational awareness may outweigh any economic disadvantage. Airport capacity during fog conditions could be improved. Additionally, the pilot's ability to avoid runway incursions under night/low visibility conditions could be substantially improved.

Recent advances in mini-computers and micro-computers have made possible the development of low cost flight test data acquisition systems, suitable for general aviation aircraft. The development of a data acquisition system at a general aviation company will be discussed. Use of an on-board mini-computer to minimize the required man-hours for general aviation aircraft performance data reduction will also be discussed. Additionally, both the advantages realized and the implementation problems will be described. The present trend in computer development will probably lead to more extensive use of on-board computers for general aviation flight test activities in the future.

Since light aircraft are being used more and more frequently in the IFR environment, icing is becoming a greater operational problem. This paper reviews the icing problem for light aircraft. Design criteria and flight testing techniques are discussed. The discussion is limited to general aviation aircraft whose maximum takeoff gross weight is less than 6000 lb. Both theoretical and flight test data are reviewed. Data are included which describe the increase in instrument-rated pilots and IFR flying activity in recent years. Flight profiles of a typical light aircraft are compared with larger aircraft. Performance penalties due to ice accumulations are presented for light aircraft, based on flight test experience to date at the Commercial Aircraft Div. of Cessna Aircraft Co.