Uncontrolled Re-entry Risk for Aviation and the benefits of real time information services

The increasing number of satellites and space debris reentering Earth's atmosphere poses significant challenges to aviation safety, particularly due to the unpredictability of uncontrolled reentries. With the rapid growth of satellite constellations, these events are expected to increase, and despite advancements in tracking systems and controlled reentry technologies, many reentries remain difficult to predict. While real-time monitoring tools such as the U.S. Space Data Integrator (SDI) and Europe's SpaceTrack offer critical support for Air Navigation Service Providers (ANSPs) to manage debris events, a gap persists in addressing the hazards posed by uncontrolled reentries. The main challenge lies in the timing and precision of reentry predictions. Current hazard areas are often too large to manage effectively. The size of the hazard area combined with the uncertainty of location can lead to unnecessary airspace closures and widespread disruption of global air traffic, which in turn compromises aviation safety. A notable example is the November 2022 uncontrolled reentry of a Chinese Long March 5B rocket stage, which resulted in airspace closures across Europe, even though the debris ultimately landed in the Indian Ocean. Accurate reentry trajectories and hazard zones can typically only be pinpointed minutes before the event, leaving limited time for authorities to respond. Real-time data provision during the final moments of reentry is critical for improving the accuracy of hazard area predictions, enabling timely updates to affected airspace regions. This can ensure aviation safety without unnecessarily closing or evacuating large areas of airspace. By integrating real-time hazard information, advanced reentry prediction tools, and robust communication methods, the aviation sector can mitigate risks while minimizing operational disruptions. The presentation will demonstrate the essential mechanisms and services through which real-time data provision can support and maintain aviation safety, considering the global and cross-border nature of debris mitigation efforts. It will also address the need for interoperable, internationally harmonized procedures to manage uncontrolled reentries effectively.