Collision and TCAS alerting models have been developed to analyze non-normal events and their mitigations during operations with two traffic streams on defined parallel tracks. Two particular events, i.e. deviations from path and not establishing on path during path turn-on, are emphasized in this paper. This paper will demonstrate how these collision and TCAS models can be used as tools for the design and development of parallel instrument approach operations. Extension of these models to general non-parallel traffic streams and operations with mitigation actions will also be discussed.
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