Visual approach slope indicator: Difference between revisions

Revision as of 01:26, 2 February 2018

Revision as of 16:42, 6 February 2018

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[[Image:Vasi-1.JPG|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. TheThis firstused setto of lights appearing red andbe the secondmost setcommon whitetype isof notvisual possibleapproach lestslope theindicator planesystem, werehowever upsideit downis orbeing thephased approachout waswith coming from above,PAPIs (which isare virtuallycloser never.together Thisand istherefore themore mostefficient commonto typesite ofand visual approach slope indicator systemmaintain).

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