On June 17, 1910, aviator Blanc was summoned before the tenth chamber of the Seine criminal court following an accident that occurred on October 18, 1909, at Port-Aviation during an air meeting. The incident involved a monoplane whose propeller detached, fell into the crowd, and injured several spectators. Two victims, Madame Férand and Mr. Homot, sued Blanc for 100,000 francs in damages, alleging imprudence. This case is a fascinating early example of legal accountability in aviation. The court ultimately acquitted Blanc and the company's board president, Mr. de la Gâtinerie, ruling that no negligence could be attributed to them. However, the event highlights a timeless principle: pilots are responsible for the safety of those on the ground, a concept that remains central to ATPL and ATC training today. For modern aviation students, this historical case underscores the evolution of safety culture. In the early 20th century, aviation was experimental, and legal frameworks were rudimentary. Today, ATPL candidates study rigorous accident investigation protocols, risk management, and the legal implications of pilot actions under regulations like ICAO Annex 13. ATC trainees learn how to manage airspace to prevent such incidents, emphasizing the importance of communication and situational awareness. The propeller detachment also serves as a reminder of the critical role of maintenance and pre-flight checks. While technology has advanced, human factors and procedural compliance remain key to preventing accidents. This case from 1910 is not just a historical curiosity—it is a lesson in the foundations of aviation safety that every ATPL and ATC student should reflect on.