Six instrument pilots were tested for accuracy of landing under these conditions of visibility in a Cessna T-50 aircraft: Condition A. Outside vision restricted to an image cast on a ground glass screen by a projection periscope. The image confined the range of outside visibility to a visual angle of approximately 10 degrees, both horizontally and vertically, and binocular cues of depth and movement were eliminated. Condition B. Similar restriction of the outside visual field achieved by use of vision reducing goggles and a vision directing screen. Binocular cues were present. Condition C. Unrestricted outside visibility as in normal contact flight. This situation served as control. Every pilot made five landings under each condition, ninety landings being made in all. Conditions were rotated among pilots to balance practice effects. Safe approaches and landings were made by all pilots in all conditions. Landings were most accurately made in Condition C, control, where the average error was 85.1 feet from the landing 'spot' (sign of error disregarded). The average error for landings in Condition B (vision reducing goggles) was 142.4 feet. Least accurate landings were made in Condition A (periscope) where the average error was 251.8 feet. These differences were found to be significant in each case, but the difference between periscope and goggles may be exaggerated as a result of certain unforeseen procedural difficulties which were uncontrolled. (Author)
The Effects of Eliminating Binocular and Peripheral Monocular Visual Cues Upon Airplane Pilot Performance in Landing
1948
2 pages
Report
Keine Angabe
Englisch
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