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Meeting	ACGS Committee Meeting 98 - Williamsburg - October 2006
Agenda Location	8 SUBCOMMITTEE D - DYNAMICS, COMPUTATIONS AND ANALYSIS 8.3 En Route Descent Advisor and Tailored Arrival
Title	En Route Descent Advisor and Tailored Arrival
Presenter	Rich Coppenbarger
Affiliation	NASA Ames Research Center
Available Downloads*	presentation
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Abstract	Tailored Arrivals (TA) are a comprehensive method of planning, communicating, and controlling descent trajectories at near-idle power from cruise altitude to runway threshold, for maximum fuel efficiency and minimal environmental impact. The potential benefits of TA are most apparent during complex, capacity-constrained operations where, in today’s environment, tactical vectoring and altitude level-offs, required for traffic management, often interrupt efficient descent profiles. Ground-based automation capable of tailoring arrival clearances to accommodate continuous descents in the presence of complex scheduling, sequencing, and separation constraints is the key to substantial widespread benefits. Towards this aim, NASA has recently begun adapting its En Route Descent Advisor (EDA) automation to support a TA concept. In cooperation with the FAA, Boeing and United Airlines, field trials were recently completed involving the delivery of EDA-supported TA descent clearances over digital data-link to Boeing 777 aircraft inbound to San Francisco from Honolulu. These trials represent an important step towards validating the technologies and procedures required for TA, and strongly support the trajectory-based concepts being developed under the joint government/industry Next Generation Air Transportation System (NGATS) initiative. The presentation will describe the concept, benefits, and supporting technologies behind TA, and present initial findings from the oceanic field trials.