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Interval Management (IM) is a future airborne spacing concept whose goal is to provide more precise management of inter-aircraft spacing, yielding throughput improvements and greater use of fuel-efficient trajectories for arrival and approach operations. The IM capability is enabled by avionics that provide speeds to achieve and maintain an assigned spacing interval relative to another aircraft. IM fits into a larger arrival management concept, composed of three parts: a ground-based sequencing and scheduling function to develop an overall arrival strategy, ground-based tools to support the management of aircraft to that schedule, and both groundand airborne-based tools for managing the interval between aircraft.. The first two components are being developed by the FAA in the form of Ground Based Interval Management Spacing (GIM-S) and Terminal Sequencing and Spacing (TSAS). The third component enables IM Operations. This paper builds on methodology developed by the authors, defining a model for mixed GIM-S, TSAS, and IM operations. The model starts with a directed acyclic graph G = (V, E) representing the terminal route structure to a single runway. The schedule, arrival times, and other quantities are defined on G in such a way that requirements and adaptation constraints can be determined for an integrated arrival management system. |
