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.3 • • • IV.4 • − Low intensity lights create the impression of being farther away (hence on a shallower glide path); A non-standard spacing of runway lights also modifies the pilot's perception of the runway distance and glide path; and, If runway lighting is partially visible (e.g., during the downwind leg or during the base leg of a visual or circling approach), the runway may appear being farther away or at a different angle (i.e., the intercept angle is perceived as smaller than actual). Runway Approach Aids The following runway approach-aids and conditions may increase the crew exposure to visual illusions: Glide slope beam being unusable beyond a specific point because of terrain or below a specific altitude/height because of approach over water; Offset localizer course; and/or, 2-bar VASI, if used below 300 ft height above touchdown (HAT) for glide path corrections. Weather Conditions The following weather conditions may cause visual illusions: Precipitation's (e.g., rain, fog, snow): Flying in light rain, fog , haze, mist, smoke, dust, glare or darkness usually create an illusion of being too high; Page 7 of 15

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