Neutralisation protocol: behind the safety system that protects lives on every launch

The Flight Safety Division tracks Ariane 6 in real time and can trigger its automatic destruction to protect lives. Euronews speaks to an engineer making sure all goes well. Behind the roar of the engines and the visual spectacle of each lift-off at Europe's Spaceport in French Guiana, a critical division is at work whose role can go unnoticed, unless something goes wrong: the Flight Safety Division. This team has a clear mission: to ensure the absolute protection of the population and technical staff from the moment the rocket leaves the launch pad until every stage has been shut down and fallen back to Earth. Euronews spoke to Léonard Buchaillot, a flight safety engineer at France's National Centre for Space Studies (CNES), to understand how safety is managed around a launch of this scale. Real-time monitoring and trajectory analysis Safety work does not start with engine ignition. Hours before lift-off, specialists process and assess weather data in real time to rule out weather-related risks in Kourou. Once the flight sequence has begun, the division takes charge of ballistic tracking: - Trajectory analysis: the exact position of the rocket is tracked millisecond by millisecond, and its behaviour is compared with theoretical models. - Intervention window: the team maintains the ability to act and monitor the vehicle while it flies over the ocean and until the launcher has passed through the atmospheric layer and begins flying over continental areas. The red button: when and why a rocket is neutralised Decision-making in the event of an anomaly is instantaneous. To prevent risks on the ground or uncontrolled deviations of a mass of hundreds of tonnes loaded with fuel, engineers work with predefined limits known as flight corridors ('flight corridors'). If telemetry indicates that Ariane 6 is deviating from the calculated trajectory and crossing the limits of that safety corridor, the protocol is automatic and non-negotiable: a neutralisation command is sent. This order triggers the launcher's self-destruct systems, breaking it up in a controlled way over clear ocean areas before it can pose a danger. High-intensity training under extreme pressure In the flight control room there is no room for doubt or improvisation. A margin of error of just a few seconds can make the difference between a mission safely aborted and an accident. That is why the safety team undergoes continuous training through highly demanding weekly simulations. These regular drills recreate critical launcher failures in real time to fine-tune staff coordination, keep operational certifications up to date and ensure that the response to any emergency is automatic, accurate and coordinated.