October 2007 Issue

It’s Not A VASI, Dummy

The sidebar discussion "Safer Descents" (September 2007) called the four horizontal lights in the pictures a "VASI" (Visual Approach Slope Indictor). In fact, what was photographed was a "PAPI" (Precision Approach Path Indicator). A VASI consists of two or three pairs of lights arranged in a vertical fashion. As its name suggests, a PAPI provides a more precise indication to the pilot of his aircraft’s position relative to the set glidepath.

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