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Reorganise. Explain Design first, then Interpretation. Finally History. "Meaning" and "Background" sections consolidated into "Interpretation" |
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{{Short description|Visual aid in aviation}}
{{Refimprove|date=December 2009}}
A '''precision approach path indicator''' ('''PAPI''') is a [[visual aid]] that provides guidance information to help a pilot to acquire and maintain the correct approach (in the vertical plane) to an airport or an aerodrome. It is generally located on the left-hand side of the runway approximately 300 meters beyond the landing threshold of the runway. ▼
[[Image:PAPI Jersey Airport.JPG|thumb|The PAPI can be seen to the right (non-standard) side of the runway. The aircraft is slightly below the glideslope.]]
▲A '''precision approach path indicator''' ('''PAPI''') is a [[visual aid]] that provides guidance information to help a pilot to acquire and maintain the correct approach (in the vertical plane) to an airport or an aerodrome. It is generally located on the left-hand side of the runway approximately 300 meters beyond the landing threshold of the runway.
==Design==
A typical engineering design specification for a PAPI light unit is shown below:
[[File:PAPI-Section.svg|thumb|350px|Schematic diagram of longitudinal section<br />
1 = Axis datum<br />2 = Light source<br />3 =
Optical construction:
* Preadjusted 2-lamp optical assembly.
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