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[Precision] Approach Path [Indicator] - Used in avionics to guide planes to [the runway] using the approach path (Glide Path). A series of 3 or 4 lights that change colour from white to red in accordance to the height of the aircraft. Red over Red - Too low Red over White - On the Glide path White over White - Too high The PAPI lights can be seen up to 5 miles in daylight and upto 20 miles at night.
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