This paper presents a case study of modeled arrival operations which utilize descent trajectories optimized for reduced fuel burn and pollutant emissions. Arrival flights descending along optimized vertical profiles are modeled by transforming the descent trajectories of a set of baseline arrival flights, taken from observed radar track data, into descent trajectories at idle throttle. The trajectories of the baseline and modeled arrival flights are described in depth, along with the transformation that connects them. Two implementation scenarios (unconstrained and constrained) of optimized descent procedures during daytime operations are analyzed. In the case of unconstrained optimized descent both the potential benefits and conflicts that result from such operations are quantified. In the case of constrained optimized descent, mitigation strategies are applied which remove the potential conflicts, but also reduce the level of potential benefit. The constrained optimized descent scenario demonstrates that by carefully choosing which level-offs are removed, both benefits can be obtained and conflicts avoided simultaneously. The major conclusion that may be drawn from this study is that procedures for optimized descent arrival operations can be implemented with fuel and emissions savings benefits while avoiding conflicts with other traffic.
Theme: Continuous Descent Approaches
Keywords: continuous descent arrival, emissions reduction, fuel savings, green arrivals, optimized descent profile