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A '''traffic collision avoidance system''' ('''TCAS''', pronounced {{IPAc-en|t|i:|k|æ|s}}; ''TEE-kas''), also known as a '''traffic alert and collision avoidance system''', is an [[aircraft collision avoidance systems|aircraft collision avoidance system]] designed to reduce the incidence of [[mid-air collision]] (MAC) between [[aircraft]]. It monitors the [[airspace]] around an aircraft for other aircraft equipped with a corresponding active [[Transponder (aviation)|transponder]], independent of [[air traffic control]], and warns pilots of the presence of other transponder-equipped aircraft which may present a threat of MAC. It is a type of [[airborne collision avoidance system]] mandated by the [[International Civil Aviation Organization]] to be fitted to all aircraft with a maximum take-off mass (MTOM) of over {{convert|5700|kg|abbr=on}} or authorized to carry more than 19 passengers. CFR 14, Ch I, part 135 requires that TCAS I be installed for aircraft with 10-30 passengers and TCAS II for aircraft with more than 30 passengers. ACAS/TCAS is based on [[secondary surveillance radar]] (SSR) [[transponder (aviation)|transponder]] signals, but operates independently of ground-based equipment to provide advice to the pilot on potentially conflicting aircraft.
[[File:Tcas EU-Flysafe.jpg|thumb|upright=1.14|
In modern [[glass cockpit]] aircraft, the TCAS display may be integrated in the Navigation Display (ND) or [[Horizontal situation indicator|Electronic Horizontal Situation Indicator]] (EHSI).
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