![]() ![]() If low more red lights will be visible.If high more white lights will be visible.On glidepath when two white and two red lights are viewed.Precision Approach Path Indicator (PAPI) If “Low on Glide Slope”, both appear red. If “High on Glide Slope”, both appear white. If on “Glide Slope”, first set of lights will appear white and second set red. Standard VASI Consist of two sets of lights Each set designed to appear either white or red depending on angle viewed. Standard VASI system viewed from approach. ![]() Visual Approach Slope Indicator (VASI) The VASI is a system of lights on the side of an airport runway that provides visual descent guidance information during the approach to a runway View of VASI from approach.
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