Abstract
The Traffic Alert and Collision Avoidance System II (TCAS II) is an airborne system that uses active surveillance to alert the pilot of an equipped aircraft to the presence of other nearby aircraft. TCAS II is currently required in the United States on all commercial aircraft with more than 30 seats, and will soon be mandated in many European countries as well. An industry team recently completed the development of requirements for Version 7 of TCAS II. Version 7 is intended to address all known remaining problems and to optimize system performance; the system is also compliant with the ICAO Standards and Recommended Practices for airborne collision avoidance systems. This paper presents a high-level view of the changes that have been made in TCAS Version 7 and the reasons behind those changes. The paper focuses primarily on improvements to the collision avoidance logic.
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