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The Airborne Collision Avoidance System II (ACAS II) was introduced in order to reduce the risk of mid-air collisions or near mid-air collisions between aircraft.It serves as a last-resort safety net irrespective of any separation standards.he safety benefits delivered by ACAS are usually expressed in terms of the risk ratio (does ACAS make safety better or worse?). For Europe, ACAS is estimated to reduce the risk of mid-air collision by a factor of about 5 (i.e. a risk ratio of 22%).
In the air, other systems have. been developed and are currently in use to prevent mid-. air collisions. This article focuses on the widely fielded, crucial technology called the Traffic Alert and Collision. Avoidance System (TCAS).