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Old 11th May 2010 | 12:16
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dixi188
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From: Dorset UK
I think you mean ACAS (Airborne Collision Avoidance System), not ACARS (Aircraft Communication Addressing and Reporting System)

ACAS is TCAS II version 7 (Traffic Collision Avoidance System).

Search Wikipedia for TCAS and you will get a description.
It also says that work on TCAS III has been suspended.

Hope this helps.
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