𝐕𝐢𝐬𝐮𝐚𝐥 𝐀𝐩𝐩𝐫𝐨𝐚𝐜𝐡 𝐒𝐥𝐨𝐩𝐞 𝐈𝐧𝐝𝐢𝐜𝐚𝐭𝐨𝐫 (𝐕𝐀𝐒𝐈)

PAPI & VASI

🛩️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.

🛩️Basic visual approach slope indicators consist of one set of lights set up some 7 metres (23 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.

🛩️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.

🛩️This used to be the most common type of visual approach slope indicator system.

🛩️however, it is being phased out and replaced by Precision approach path indicators(PAPIs), which are closer together and therefore more efficient to site and maintain.

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