Traffic Alert and Collision Avoidance System (TCAS)
Traffic Alert and Collision Avoidance System (TCAS) :
A type of airborne collision avoidance system (ACAS) based on a family of airborne equipment that functions independently of the ground-based ATC system to detect potential conflicting aircraft that are equipped with secondary surveillance radar (SSR) transponders. There are three different versions: TCAS I provides traffic advisories; TCAS II provides traffic advisories and vertical resolution advisories (RA); and TCAS IV, when developed, will provide traffic advisories and vertical and horizontal RAs. See also: Airborne Collision Avoidance System (ACAS)
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