目视进场下滑显示灯
目视进场下滑显示灯（Visual Approach Slope Indicator, VASI）是一组设于跑道旁，向飞行员用作显示飞机进场下滑角度是否适合的灯号。据规定，灯号于日间最多可以在8公里或者在夜间时于32公里外看见。目视进场下滑显示灯并不是甚么仪器，只是一组加了特别灯罩让飞行员在不同角度和距离下能看到不同颜色的灯而已，所以在更换显示灯后，只要灯罩不变都不需要再次调校。
Visual approach slope indicator
中文百科
英语百科
Visual approach slope indicator 目视进场下滑显示灯
The visual approach slope indicator (VASI) is a system of lights on the side of an airport runway threshold that provides visual descent guidance information during approach. These lights may be visible from up to 8 kilometres (5.0 mi) during the day and up to 32 kilometres (20 mi) or more at night.
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