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Precision approach path indicator (PAPI) - Features - Infinite Flight Community
How It Works: VASI Lights - Aero Corner
Comparison of PAPI, VASI, and OLS meatball and datum lights... PAPI - Precision Approach Path indicator. A precision approach path indicator (PAPI) is a visual aid that provides guidance information to help
airport - What's the functional difference between PAPI and VASI? - Aviation Stack Exchange