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    TRAMS - Transition to Mode-S

    The TRAMS simulation is an EUROCONTROL project to investigate the operational aspects associated with the application of Mode-S in ATM. These aspects were explored through real time simulation.The simulation was prepared at the EUROCONTROL Experimental Centre in Bretigny S/O, and executed in the ENAV Experimental Centre.The simulation was based on the ITI (Italian Interface project) HMI, with specific MODE_S related aspects.

    TRAMS Validation aimed to assess safety of the hybrid surveillance environment that is expected to take place in the en-route ATM during the transition from Mode A to Mode S systems. The introduction of new concepts in a complex working environment implies a spontaneous re-design of the relationships among the components of the system, i.e. human component, software components, etc… As consequence the validation requires a deep analysis of the social and technical aspects of the work context, in order to assess the role that each component plays in the process.

    The method that was used to assess safety is based on the systematic identification of components at stake in the process observed and of their interactions. The critical interactions among the components, in particular those involving the human component, were the focus of the analysis. Through the proactive analysis it was also possible to detect latent criticality, not emerged during the real time simulation, but likely to produce breakdowns and/or to undermine the safety of the whole system. To support the results obtained through qualitative methods, also a quantitative approach of investigation was applied. During any test session, measurements were taken in order to verify hypotheses formulated by means of quantitative data. The combination of the two methodologies is a means to assure high quality and well documented results. In fact on one side, the complexity of the real operational environment is considered and analysed, on the other side quantitative data can provide a scientific and systematic support to the context analysis.