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Traffic Alert and Collision Avoidance System
abbr.	TCAS system (MichaelBurov)
abbr., avia.	TCAS (MichaelBurov)
transp., abbr.	TCAS
traffic alert and collision avoidance system
avia., Canada	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.

Traffic: 15 phrases in 5 subjects

Abbreviation	8
Aviation	1
Meteorology	1
Transport	3
United States	2