A Good Pilot is Always Learning

Human Performance Visual Illusions Awareness

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Human Performance Visual Illusions Awareness Flight Operations Briefing Notes IV.2 • − • • • − − • − • • • − Runway Environment Runway dimensions / aspect ratio (Figure 3): The runway aspect ratio (i.e., its length relative to its width) affects the crew visual perspective view of the runway: A wide or short runway (low aspect ratio) creates an impression of being too low; and, A narrow or long runway (high aspect ratio) creates an impression of being too high. Figure 3 Center Photo : LFBO 14 R (3500 m x 45 m) / 3-degree glide slope / 200 ft RA Runway uphill or downhill slope: An uphill slope creates an illusion of being too high (impression of a steep glide path); and, A downhill slope creates an illusion of being too low (impression of a shallow glide path). Approach and runway lighting: The approach and runway lighting (including the touchdown zone lighting) affects the dept perception as a function of: The lighting intensity; The daytime or night time conditions; and, The weather conditions. Bright runway-lights create the impression of being closer to the runway (hence on a steeper glide path); Page 6 of 15

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