Airborne Collision Avoidance System

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Airborne Collision Avoidance System (ACAS) is an ICAO (International Civil Aviation Organization) standard specified in ICAO Annex 10 Vol IV which provides pilots with a system independent of air traffic control to detect the presence of other aircraft which may present a threat of collision. Where the risk of collision is imminent, the system provides an indication of a manoeuvre that will reduce the risk of collision.

As of 2006, the only implementation that meets the ACAS II standards set by ICAO is Version 7.0 of TCAS II (Traffic Alert and Collision Avoidance System) produced by two manufacturers: Rockwell Collins and Honeywell.

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