VASI vs. PAPI: Understanding the Differences and Similarities
Pilot Institute
OCTOBER 17, 2024
This system of lights is visible from 3-5 miles during the day and 20 miles at night. Using the VASI is crucial as it gives you safe obstruction clearance within 10 degrees of either side of the runway centerline and around four nautical miles from the runway threshold. nautical miles from the runway threshold.
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