Visual approach slope indicator: Difference between revisions

Revision as of 18:31, 28 February 2017

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[[Image:Vasi-21.pngJPG|thumb|Standard visual approach slope indicator (circled in red)]]

Basic visual approach slope indicators consist of one set of lights set up some {{convert|7|m|ft}} from the start of the runway. Each light is designed so that it appears as either white or red, depending on the angle at which it is viewed from. When the pilot is approaching the lights at the proper angle, meaning the pilot is on the [[glide slope]], the first set of lights appears white and the second set appears red. When both sets appear white, the aircraft is too high, and when both appear red it is too low. The first set of lights appearing red and the second set white is not possible lest the plane were upside down or the approach was coming from above, which is virtually never. This is the most common type of visual approach slope indicator system.

A mnemonic to remember the colors and their meaning is :<br>