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Visual Approach Slope Indicator Systems
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(Redirected from VASIS)
| Article Information | ||
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| Category: | General | 
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| Content source: | SKYbrary | 
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| Content control: | EUROCONTROL | 
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Visual Approach Slope Indicator System (VASIS)
Description
A visual approach slope indicator system is a system consisting of four light units situated on the left side of the runway in the form of two wing bars referred to as the upwind and downwind wing bars. The aircraft is on slope if the upwind bar shows red and the downwind bar shows white, too high if both bars show white, and too low if both bars show red. Some aerodromes serving large aircraft have three-bar VASIS, which provide two visual glide paths (GP) to the same runway.
The main systems in use are the:
- AT-VASIS: abbreviated T visual approach slope indicator system;
- PAPI: precision approach path indicator
- APAPI: abbreviated precision approach path indicator
Related Articles
- FAROS - Final Approach Runway Occupancy Signal (FAROS) works by providing a visual signal to aircraft on final approach to land that the runway ahead is occupied by another aircraft or a vehicle. This is done by adapting the PAPI or VASI system to alter from steady lights to flashing mode whilst the identified hazard remains.
- Visual Approach