Safety Study of TCAS II for Logic Version 6.04
MITRE CORP MCLEAN VA
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A new System Safety Study of Traffic Alert and Collision Avoidance System II TCAS II was performed to compare the safety of logic version 6.04 with the present version 6.0. The study uses a considerable body of encounter data extracted from Automated Radar Terminal System ARTS ground-based radar data at eight U.S. sites. Encounter geometries are modeled using the statistics of the observed data. The performance of TCAS logic is simulated using both complete logic versions. The perceived separation statistics are combined with altimetry error models to calculate risk for each encounter geometry. These results are combined in the proportions of encounter geometries found in the airspace at each site. Using a fault tree for the Critical Near Midair Collision event, the Risk Ratio is calculated for each logic version relative to the risk of not using TCAS. This result is discussed in the context of the improved compatibility of the newer logic with respect to the Air Traffic Control ATC system, which would increase overall safety.
- Safety Engineering
- Air Navigation and Guidance