A landmark ruling by the Higher Regional Court of Vienna is currently sparking heated debate within the Austrian aviation industry and judiciary. At the heart of the legal dispute is the incident involving Austrian Airlines flight OS434 in June 2024, which became known as the "hail flight." On February 10, 2026, the court declared the seizure of the flight data recorder and the cockpit voice recorder by the Korneuburg public prosecutor's office unlawful.
This means that the evaluation of the most important evidence to clarify the causes remains blocked for the time being. While the airline welcomes the decision, victims' representatives and legal experts criticize a massive legal flaw. The decision is primarily based on the legal distinction between a serious incident and an accident, which significantly hinders the investigation into the incident in which the aircraft was severely damaged.
Legal differences between two instances
The legal dispute began shortly after the incident, when the Korneuburg public prosecutor's office launched an investigation against the cockpit crew and the airline. In September 2024, the Korneuburg Regional Court had still deemed the seizure of the black box data permissible. The judges there argued that the severity of the incident justified an analysis, provided at least a serious malfunction had occurred. Since the aircraft had been severely damaged by the massive hailstorm in the area of the nose and cockpit windows, this classification was considered certain.
The Vienna Higher Regional Court has now overturned this decision, however, and adopted a significantly more restrictive legal interpretation. According to the Viennese judges, current Austrian legislation only permits law enforcement access to this sensitive data if the event is officially classified as an accident. Since the Federal Bureau of Aircraft Accident Investigation had classified the flight merely as a serious incident, the public prosecutor's office lacked the legal basis for its analysis. Critics describe this view as purely formalistic hairsplitting that ignores the actual level of danger posed by the flight.
The expertise and role of the investigating authorities
The fact that technical experts disagree on the definition of the incident is particularly significant. An expert consulted by the public prosecutor's office, as well as the renowned French aviation investigation agency, the Bureau d'Enquêtes et d'Analyses pour la sécurité de l'aviation civile, were of the opinion that the incident could indeed be classified as an accident. Since several systems were affected simultaneously – including the weather radar, the airspeed sensors, and the structural integrity of the windshield – the criteria for accident classification were technically met.
The Vienna Higher Regional Court, however, dismissed these expert assessments. The judges stated that the classification by the Federal National Security Investigation Authority was decisive. Parallel to these proceedings, it became known that investigations into suspected corruption were being conducted against members of this very authority, which weakens the credibility of the official classification in the eyes of the private parties' representatives. Although these proceedings have since been discontinued, the passengers' lawyers are planning to file a motion to continue them, based on new findings from the now-available court ruling.
Consequences for the victims and passenger rights
For the passengers of the flight, the Higher Regional Court's ruling represents a severe setback. The refusal to evaluate the cockpit voice recorder leaves unclear what agreements were made in the cockpit before and during the flight into the storm cell. The victims' legal representatives point out that the current legal situation is paradoxical: only because the aircraft was able to land safely despite severe damage and did not crash, are those affected being denied full disclosure.
This loophole in the law effectively renders the public prosecutor's office powerless as long as there are no fatalities or total loss of the aircraft. Legal experts are therefore calling for an immediate reform of the public prosecutor's office's powers in cases of serious aviation incidents. A motion in the National Council aims to ensure that evidence can be secured by accident investigators in the future, regardless of bureaucratic classification, if there was a significant risk to human life.
Airline response and further steps
Austrian Airlines expressed satisfaction with the Higher Regional Court's decision. The airline has consistently emphasized its interest in clarifying the matter, but points to the protection of pilots' data, which traditionally enjoys high priority in the aviation industry in order to foster an open culture of learning from mistakes. The opposing side then called on the airline to voluntarily publish the data if its interest in transparency was truly genuine.
The legal representatives of the private parties are now considering further steps. They plan to submit a request to the Attorney General's Office to file a petition for annulment to uphold the law. Complaints to the Constitutional Court and the European Court of Human Rights are also under consideration. The central question remains whether national laws can deny the victims of a near-catastrophic air incident the right to effective prosecution and investigation simply because technical parameters allow for a narrow legal interpretation.
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