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Safety 6 min

Understanding TCAS and Collision Avoidance

How automated onboard technology keeps aircraft safely separated in the sky

TL;DR — TCAS (Traffic Alert and Collision Avoidance System) is an airborne technology that monitors nearby transponder-equipped aircraft and issues Traffic Advisories (TAs) and Resolution Advisories (RAs) to prevent mid-air collisions. Developed after accidents such as the 1978 PSA Flight 182 collision and the 1986 Cerritos mid-air collision, TCAS became mandatory on most commercial aircraft in the following decades. Following the 2002 Überlingen accident, international rules were revised to require pilots to follow TCAS RAs even when they conflict with air traffic control instructions. While highly effective, TCAS has limitations, including reliance on functioning transponders and vertical-only guidance.

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