What does two red and two white lights indicate on a VASI?

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The indication of two red lights and two white lights on a Visual Approach Slope Indicator (VASI) means that the aircraft is on the correct glide path for landing. The VASI system provides visual cues to pilots to assist in their descent to the runway, and the combination of these lights shows that the aircraft is at the appropriate angle for approach.

In the context of the other options, describing the aircraft as below the glide path, above the glide path, or in a stall would be indicated by different combinations of lights. For example, if the plane were below the glide path, you would typically see more red lights than white. Thus, the presence of two red lights and two white lights clearly signals that the aircraft is aligned correctly for landing.

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