Abstract
This paper describes the method and results of safety assessment for the North Pacific (NOPAC) composite separation route system. The collision risk due to loss of vertical separation is estimated based on the observation data on the navigation performance of aircraft and traffic flow characteristics. In order to estimate various model parameters of the collision risk model(Reich model), the data on the tracks obtained by an air route surveillance radar(ARSR) and the traffic information extracted from the flight progress(flight plan) data were used for analyses. The result indicated that the vertical collision risk in the route system is less than the target level of safety(TLS) of the ICAO, i.e., 2.5×10^<-9> [fatal accidents/flying hour].
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