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precision approach path indicator
avia., Canada	A visual glide slope indicator VGSI consisting of four light units normally situated on the left side of the runway on both sides of the runway, in the case of the military in the form of a wing bar and indicating that the aircraft is on slope if the two units nearest the runway show red and the two units furthest from the runway show white, too high if all units show white, and too low if all units show red. (VGSI)
Precision Approach Path Indicator
abbr., scottish	PAPI

precision: 4 phrases in 1 subject

Abbreviation

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