Improving the Resolution Advisory Reversal Logic of the Traffic Alert and Collision Avoidance System
April 2007
Andrew D. Zeitlin, The MITRE Corporation
Thierry Arino, Sofréavia
James Kuchar, MIT Lincoln Laboratory
ABSTRACT
The Traffic Alert and Collision Avoidance
System (TCAS II) is the worldwide standard system
for manned aircraft to avoid collisions with airborne
transponder-equipped traffic. A safety vulnerability
of the collision avoidance logic was reported by
European analysts, who also proposed a change to
correct it. The safety issue concerns limitations in
the ability of TCAS to reverse the sense of a
Resolution Advisory (RA) during an encounter. The
issue was addressed by a team of experts in the
Requirements Working Group (RWG) of RTCA
Special Committee 147. This paper discusses
the problem, the metrics and methods used in the
analysis, and presents results that quantify the
effectiveness of the proposed solution. Finally,
recommendations are presented for implementing
the change.
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