Precision approach path indicator: Difference between revisions

Revision as of 15:41, 1 March 2023

Revision as of 15:43, 1 March 2023

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A PAPI installation consists of a bar of four units. The inner edge of the PAPI installation should be situated 15m from the runway edge, and not closer than 14m to any runway or taxiway. An abbreviated system, A-PAPI, consists of two units with the inner unit located 10m from the runway edge.<ref name="ICAO"/> Units should be frangible but not susceptible to jet blast.

The optimum distance from the runway threshold depends on the wheel clearance over the threshold of the types of aircraft landingexpected to land on the runway; compatibility with non-visual glide paths such as ILS down to the minimum possible range and height; and any difference in elevation between the PAPI installation and the runway threshold. This optimum distance may be adjusted depending on runway length and obstacle clearance. Harmonisation between PAPIs and an ILS system must take into account the distance between eye height and ILS receiver height for various aircraft.<ref name="ICAO"/>{{rp|8-33}}

==Interpretation==