Safety Study of TCAS II for Logic Version 6.04

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...

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Bibliographic Details
Main Authors: Mclaughlin, Michael F, Zeitlin, Andrew D
Format: Report
Language:English
Subjects:
Air Navigation and Guidance
AIR TRAFFIC
AIR TRAFFIC CONTROL SYSTEMS
ARTS(AUTOMATIC RADAR AND TERMINAL SYSTEM)
AVIATION SAFETY
COLLISION AVOIDANCE
COMPATIBILITY
ERRORS
FAULT TREES
GEOMETRY
HEIGHT FINDING
NEAR MID-AIR COLLISION
PROBABILISTIC RISK ASSESSMENT
RADAR
RATIOS
RISK
RISK RATIO
Safety Engineering
SEPARATION
SITES
STATISTICS
SYSTEM SAFETY
TCAS
TCAS(REAFFIC ALERT AND COLLECTION AVOIDANCE SYSTEM)
TERMINALS
VERSION 6.04
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Summary: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.