Template:POTD protected/2008-09-21
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The Precision Approach Path Indicator (PAPI) is a light system positioned beside the runway that consists of two, three, or four boxes of lights that provide a visual indication of an aircraft's (fixed wing or rotor wing) position on the glidepath for the associated runway. The FAA standard for the PAPI is the same as the ICAO's standard Visual Approach Slope Indicator.
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