xStream

Led by DSNA (2017 - 2019)

The xStream (Cross-border SESAR Trials for enhanced arrival management) project is a SESAR 2020 Very Large Scale Demonstration (VLD). It aims at extending arrival management horizon up to at least 200 nautical miles from destination airport and at evaluating its impacts and benefits. The project will also demonstrate how arrival constraints can be computed and provided to upstream Area Control Centres (ACC).

Sites involved

ACC/UAC : Paris, Zurich
TMA : LFPG, LFPO, LSZH
Others: London TMA and ACC

Project description

The objective of xStream project is to demonstrate, at a very large scale, new extended arrival management tools and techniques that improve flight efficiency and flight predictability at airports, in TMA and in upstream ACC.
The main target is to extend arrival management horizon up to at least 200 NM in order to enable delay absorption earlier in the flight and at higher altitude that is more fuel efficient.
This delay absorption strategy is expected to smooth arrival peaks of traffic and to induce a reduction of workload for ATCO in the TMA, thus increasing safety and enabling smoother descent profiles.
To meet this objective, the project will define concept and tools for:
• Computing an extended arrival sequence with an horizon of at least 200 NM;
• Defining a delay sharing strategy between TMA, extended TMA and en-route sectors taking into account the overall network capacity and airspace user’s preferences;
• Providing the calculated arrival constraints to upstream Area Control Centres (ACC) and relevant aircraft: AMAN Allocated Time (AAT), Target Time of Arrival (TTA), Time to Lose (TTL), Miles in Trails, Speed advisory, etc.
• Executing the delay sharing strategy.
For a global picture, the project will also assess the compatibility of these concepts with the handling of inbound flows to multiple airports in the sectors of upstream ACCs. The objective is to avoid cumulative effects that could reduce some sectors capacity or flight efficiency.
The project will also associate Airspace Users in order to implement collaborative processes for the management of arrival sequence (A-Flex).
The demonstrations will be a step beyond “industrial research” and will prepare operational use, resolving potential operational issues raised by previous projects. It will serve as proof of concept for AF#1 in Pilot Common Project (PCP). The findings of these exercises may be reused into XMAN project to implement – where possible – permanent and/or improved XMAN operations.

Implementation Steps

Period
StartEndLed by
Gatwick XMAN extended to 350 NM11/201709/2019NATS
Elements of partners TP sharing with AMAN09/201709/2019NATS
Heathrow XMAN extended to 500 NM09/201809/2019NATS
Collaborative extended arrival sequence in Paris Orly and Paris CDG07/201709/2018DSNA
COP Sequencer for hostpot resolution in Paris ACC terminal sectors04/201812/2018DSNA
Improved arrival planning management and airspace user’s preferences06/201810/2018DSNA
Extended AMAN in Zurich airport01/201902/2019skyguide
Collaborative tool between Airspace Users, ATC and Network Manager (UDPP) in Zurich09/201812/2018skyguide
Improved Arrival Management and NM integration in Zurich05/201808/2018skyguide