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ENRI PAPER 114-2 Mar. 2005

Survey of Air Traffic Flow on the North Pacific Routes -After the implementation of RVSM-

Midori Sumiya, Sakae Nagaoka and Osamu Amai

Abstract:
Separation minima were reduced in an oceanic route system of the North Pacific (NOPAC). Lateral separation minima were reduced to 50NM from 100NM in 1998 and vertical separation minima were reduced to 1000ft from 2000ft in 2000. It is important to survey current traffic flow on the NOPAC routes after the implementation of RVSM (Reduced Vertical Separation Minimum). We are planning to carry out a traffic simulation to evaluate the safety level and the communication capacity for the case the separation minima are reduced as air traffic will increase in the future. This report is a basic material for the simulation.

We surveyed the west-bound traffic and the east-bound traffic at the boundary fixes on the NOPAC routes between the Tokyo FIR and@the Anchorage FIR using data of Flight Data Processing System from March 2000 to February 2001, after the implementation of RVSM. This paper describes the characteristics of air traffic flow, such as the number of flights, the distribution of the flight level transition and the number of aircraft flying in an airspace segment etc. Especially the west-bound traffic was compared with the traffic from November 1991 to October 1994, before the implementation of RVSM.

The result showed that the west-bound traffic has increased by 1.5 times in ten years. The average daily west-bound traffic count was about 105 flights /day in 2000. Before the implementation of RVSM, on R220, the proportion of flights which climb by 2000ft in the segment between FIXs separated by 660NM was 24%. After the implementation of RVSM, the proportion of flights which climb by 1000ft between the FIXs was 13%, and the proportion of flights which climb by 2000ft was 10%. The number of flights for the east-bound traffic was 65% of that for the west-bound traffic in 2000. The maximum observed number was 29 aircraft in the airspace segment (200NM ~@330NM) at the boundary fixes on the NOPAC routes. The proportion of time duration with no aircraft in the airspace segment was 5.6% after the implementation of RVSM.

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(The body of this paper is only in Japanese)
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