The Theory of Visual Judgments in Motion and its Application to the Design of Landing Aids for Aircraft

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Abstract
This paper is intended to bring the theory of the visual aids up to date, and to discuss various practical methods of increasing the safety of the approach and landing operation. Arguments are put forward to show that the guidance in the vertical plane needs to be improved, particularly in visibilities somewhat above the limiting visibility, and a new form of angle of approach indicator is described, which promises to achieve this result. The beam spreads of the approach lights should be increased, and fittings for providing guidance for circling approaches should be developed. The British design of flush-type runway light has proved! satisfactory in actual operations, and as a result, landing mats have now become practicable, even on existing runways.

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