Required Navigation Performance (RNP) procedures to closely-spaced parallel runways that include curved approach transitions afford many benefits such as reduced track miles, less fuel burn and emissions, and the potential for routings around noise sensitive areas. The Federal Aviation Administration (FAA) NextGen program plans to roll out “Established on RNP” (EoR) simultaneous approach procedures to suitable airports across the U.S. National Airspace System. In addition, International Civil Aviation Organization (ICAO) is planning revisions to guidelines related to these procedures which initially rely on lateral vs. vertical separation. A major challenge that needs to be addressed for simultaneous approaches to closely-spaced parallel runways relates to nuisance Airborne Collision Avoidance System (ACAS) alerts during normal approach operations. This paper documents joint research by Boeing and DLR to answer this challenge. The objectives were to make recommendations for the proposed ICAO rule changes, compare and contrast analysis methodologies, and suggest mitigation strategies for nuisance ACAS alerts.
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