| Explaination:
TCAS II, corresponding to ACAS II, now being required in US airspace as already mentioned for larger airliners, has greater range and bearing accuracies than TCAS I. It will offer avoidance messages as Resolution Advisories, CLIMB, INCREASE CLIMB, DESCEND, INCREASE DESCENT. If your aircraft and the target aircraft both have Mode S datalink transponders, the TCAS II computers on board the two aircraft will co?ordinate their RAs to offer complementary vertical avoidance manoeuvres to each flight crew. TCAS III, corresponding to ACAS III, at the time of publication is still being developed. When it is operational, as originally defined by ICAO, it will offer manoeuvres in the vertical and horizontal planes. This will require the target aircraft's path to be tracked accurately. In TCAS II, measurement and presentation of the relative bearing is sufficient to indicate the risk of conflict but with TCAS III, it must be known precisely and it is particularly this element which is causing the longer development time.
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