PVASI - What does PVASI stand for? The Free Dictionary
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We're used to Visual Approach Slope Indicators (VASI) and Precision Approach Path indicators (PAPI), but now with a Pulsating Visual Approach Slope Indicator (PVASI) what will you see when you're on the glidepath?
A PVASI shows you on the glide path with either a steady white or alternating read and white light.