Optimising trajectory performance benefits the smooth operation of the ATM network as a whole. In addition to improving flight efficiency, predictable trajectories help to fulfil capacity demand and reduce emissions. SESAR is researching ways to achieve this by sharing trajectory information between the cockpit and air traffic control, in particular by using data downlinked from the aircraft to enhance the performance of systems on the ground. By using aircraft-derived data such as ADS reports, and predicted route data generated by the flight management system, SESAR is improving the trajectory prediction in the tactical phase. The aim is to support four dimensional trajectorybased operations which take into account user priorities and airspace constraints.

Among focus areas, SESAR is looking to better predict a change in the rate of descent, or changes in vertical profile, based on data generated by the flight management system (FMS). This may include speed changes or continuous descent operations planned by the FMS. SESAR is also looking at how information from the flight management system can help air traffic control adjust uncertainty margins. The research is also expected to improve tactical trajectories, which are currently restricted by the lack of information available to air traffic control about aircraft preferences.

SJU references: #PJ.18-06b / Wave 2

Benefits

• Increased operational and cost efficiency
• Enhanced security
• Enhanced safety
• Enhanced predictability
• Reduced fuel consumption and emissions