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Reference Mode Effect on the Auditory Display of Aircraft Bank Angle
Final technical rept. 31 Aug 1990-31 Aug 1991
KRUG LIFE SCIENCES SAN ANTONIO TX SAN ANTONIO DIV
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This report describes a study which examined flight performance of instrument rated pilots using only an auditory bank angle display with outside in and inside out display reference modes. Spatial orientation is based on the evaluation of data from visual, vestibular, and other sensory mechanisms which provide information about motion and position relative to a stationary reference derived from walking upright on hard ground. Auditory and visual events are located by an observer within the orientational space. In an aircraft, the reference is no longer stationary and the evaluation of data from orientation mechanisms may be in error. These errors can lead to responses which, although intended to be corrective, actually are not. Visual information, for example, may be processed foveally, for recognition and identification of elements, or extrafoveally, for orientation in space. The two visual modes, recognition and guidance, can present conflicting, confusing orientation cues in aircraft. False horizons perceived while flying over water at night or over a sloping cloud bank are errors attributable to the guidance mode. Pilots sometimes accept these false cues as veridical and are unaware of the error until the true relation is recognized, perhaps too late.
APPROVED FOR PUBLIC RELEASE