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-1

The original poster's question assumes that mode S is not available. The original poster did not stipulate that only one aircraft lacks mode S, therefore, neither aircraft has mode S. Mode S is necessary for TCAS II, and therefore one cannot have a resolution advisory without a mode S transponder. Under the conditions stipulated, no mode S and only one ...


0

It is not possible to give an answer, because the TCAS II RA algorithm is not so simple. It isn't like "if A is 50 feet above B then A climb and B descent", it consider many different parameters to take a decision. Under certain conditions, it is possible that even if our aircraft is below the intruder, the RA can instruct us to climb. This paper ...


5

The TCAS algorithms are specified in RTCA/DO-185B (not freely available). In case of an encounter at same altitude with a non TCAS equipped aircraft, assuming that neither climb nor descent are inhibited, the TCAS will produce a descent advisory (part 2, sec. 2.2.4.1.2.1.5 - sense selection). This is a consequence of the somewhat subtle signs used in the ...


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