This report describes the work done to investigate the effects of different visual and motion cues during a helicopter autorotation. Three subjects acting as pilots were involved in the experiment. Each pilot conducted 16 different missions using three dimensional objects, two-dimensional objects, different horizons, different texture patterns and motion cues. These-were the independent variables under investigation in this experiment.It was found that the combination of three-dimensional objects, high resolution texture and motion improved the pilots' performance during the autorotations. But it was also found that the lack of horizon and the two-dimensional objects was also helpful in performing this maneuver.The missions represented the simulation of a helicopter autorotation. The computer generated scenes contained a landing area where all the variables were integrated. The pilots performed a series of autorotations on the designated area where they were required to land at minimum speed and minimum rate of descent.