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The '''Precision Approach Path Indicator (PAPI)''' is a [[light]] system positioned beside the runway that consists of two or four boxes of lights that provide a visual indication of an airplane's position on the [[glidepath]] for the associated [[runway]]. The [[Federal Aviation Administration|FAA]] standard for the PAPI is the same as the [[ICAO]]'s standard Visual Glide Slope Indicator.
Each box of lights is equipped with an [[optics|optical]] apparatus that splits light output into two segments: red (the lower segment) and white. Depending on the viewing, and thus the descent, angle, a pilot will see either the red or the white portion.
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