Safety Analysis of the Separation Assurance Function In Today's National Airspace System

Safety Analysis of the Advanced Airspace Concept using Monte Carlo Simulation

“…Note that VDL2 could also be utilized to uplink TSAFE resolution maneuvers if Mode S data link has failed or is not available, but it is not modeled here. TCAS is a mature system that has been operating in the national airspace system for several decades, and therefore empirical failure rate data exists for the system as a whole 9 . This analysis makes use of the empirical data ault tree decomposition of TCAS only to the extent necessary to take into consideration components that AR and TSAFE have in common.…”

“…Onboard resolution trajectory generator (AC2) 0.000097 (proxy from ref. [9]) Table A2: AR components and failure probabilities…”

“…In a recent study of separation assurance in today's National Airspace System (NAS), researchers Hemm and Busick decomposed the separation assurance function performed by today's air traffic controllers into its many hardware, software, and operational subcomponents 9 . However, the focus of their study was on today's operations, and their methodology cannot be readily extended to analyze the risk posed by a highly automated air traffic control system such as AAC that will need to be able to handle future traffic up to three times current demand.…”

Methodology for collision risk assessment of an airspace flow corridor concept

“…An onboard direction finding antenna is used to measure bearing of the intruder aircraft. Transponders (Mode S or According to the description of the TCAS concept, it can be decomposed into several components, including the transponder, speaker, and other related components which refer to the resolution advisory generation and display system [Hemm andBusick 2009, Blum, et al 2010]. Lebron et al [1983] uses a fault tree analysis to estimate the failure rate of TCAS.…”

“…The three components are Mode S transponder, speaker, and other components excluding transponder and speaker. The Mode S transponder can be further decomposed into the TCAS processor, Mode S transponder, TCAS control panel and altitude indicator [Hemm et al 2009]. The mean time between failures for each component gives the failure rate for each component.…”