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TRAFFIC ALERT AND COLLISION AVOIDANCE SYSTEM (TCAS)

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TCAS

An airborne collision avoidance system based on radar beacon signals which operates independent of ground-based equipment. TCAS-I generates traffic advisories only. TCAS-II generates traffic advisories, and resolution (collision avoidance) advisories in the vertical plane.

Source FAA Pilot/Controller Glossary · checked 2026-08-25

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