The use of intent information in an airborne self-separation assistance display design Stijn B.J. Van Dam, * Max Mulder † and M.M. (Ren´ e) van Paassen ‡ Delft University of Technology, P.O. Box 5058, 2600 GB Delft, The Netherlands In the context of future airspace organization, an ecological pilot support tool for state- based airborne self-separation in cruise flight in the horizontal plane was developed and evaluated. The design visualizes tactical maneuvering constraints in a speed-heading vector ‘action space’, imposed by the need to separate from other traffic. This paper describes how Target State (TS) and Trajectory Change Point (TCP) intent information of the own aircraft and the surrounding traffic reshapes the typical conflict geometry used to present tactical maneuver constraints of the own aircraft. The ‘break-circle’ technique is used to determine wether own aircraft maneuvers will make both aircraft pass each other ‘before’ or ‘after’ the TS or TCP maneuver occurs. The ‘ghost image’ technique is used to correctly visualize the conflict geometry for the situation after the TS or TCP maneuver. Furthermore, it is also discussed how these maneuver constraints should be mapped on the Navigation Display so that pilots can be aware of the effect of aircraft mode control changes on the constraints. This results in an intent display concept that helps pilots to effectively deal with both state-based and intent-based ‘FMS-enabled’ conflict situations across different aircraft control modes. Nomenclature ASAS Airborne Separation Assurance System (X )AT P (eXtended) Airborne Trajectory Planning CPA Closest Point of Approach EID Ecological Interface Design FBZ Forbidden Beam Zone FCU Flight Control Unit FMS Flight Management System MCP Mode Control Panel ND Navigation Display PZ Protected Zone POST trajectory after TCP PRE trajectory before TCP TCP Trajectory Change Point TCR Trajectory Change Report TSR Trajectory State Report SVE State Vector Envelope Subscripts int intruder aircraft own own aircraft rel relative on FMS on, MCP-FCU mode off FMS off, FMS-RNAV mode I. Introduction In future airspace environments, 1, 2 aircraft will fly more autonomously and would be allowed to fly a 4D trajectory of their choice. In certain parts of the airspace unmanaged by Air Traffic Controllers, pilots will be responsible for separating their own aircraft from others. Under these conditions, pilots need * PhD. Student, Control and Simulation Division, Faculty of Aerospace Engineering † Professor, Control and Simulation Division, Faculty of Aerospace Engineering ‡ Associate Professor, Control and Simulation, Faculty of Aerospace Engineering 1 of 19 American Institute of Aeronautics and Astronautics AIAA Guidance, Navigation, and Control Conference 10 - 13 August 2009, Chicago, Illinois AIAA 2009-5745 Copyright © 2009 by Delft University of Technology. Published by the American Institute of Aeronautics and Astronautics, Inc., with permission.