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PAPI (Precision Approach Path Indicator) is a visual aid system used in aviation to help pilots maintain the correct glide path during an approach for landing. It consists of a set of lights positioned beside the runway, displaying combinations of red and white lights. The colors indicate whether the aircraft is too high, too low, or on the correct approach path. When pilots see two white and two red lights, they know they are on the correct glide slope. #AviationSafety #FlightOperations #PilotT