ACAS Guide - Airborne Collision Avoidance

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Loss of Separation, Safety Nets, Publications
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This Airborne Collison Avoidance System (ACAS) Guide has been designed to support the understanding of the ACAS systems and the training of people involved in the operations of ACAS.

The Guide concentrates on operational principles as well as technical details of TCAS II version 7.1, as it is the version currently mandated and operated in Europe. The previous TCAS II versions 6.04a and 7.0, as well as TCAS I system, are also briefly described. Moreover, the forthcoming ACAS Xa/Xo system is extensively covered but it should be noted that, at the time of publication of this ACAS Guide, this system has not yet been approved for operations in European airspace. Other non-standardised traffic awareness systems, like FLARM, and Portable Collision Avoidance System (PCAS), intended for general aviation or military aircraft are not covered.

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