On June 30, 1950, the French aviation community was struck by a devastating accident during a test flight of the Armagnac, a long-range transport aircraft designed by the Société de Construction Aéronautique du Sud-Est. The prototype, registered as F-WAVA and designated SE2010-01, lost a leading-edge component, rendering the four-engine aircraft uncontrollable. It veered off the runway and burst into flames, killing two crew members (MM. Clerc and Leroy) and a worker on the ground. Pilots Pierre Nadot and Léopold Galy, who were conducting the test, survived and continued the flight test program. Six months later, on December 30, 1950, the first production model took its maiden flight, again with Nadot and Galy at the controls, over Toulouse. For ATPL and ATC students, this historical event underscores the critical importance of structural integrity and risk management during flight testing. The loss of a leading-edge component—a part that affects aerodynamic stability—highlights how even minor failures can cascade into catastrophic outcomes. In modern aviation, such incidents have led to rigorous certification processes, including structural load testing and redundancy requirements. Understanding these lessons helps future pilots and controllers appreciate why pre-flight inspections, maintenance protocols, and emergency procedures are non-negotiable. Moreover, the accident demonstrates the resilience of the aviation industry: despite the tragedy, the test program continued, leading to the successful first flight of the production model. This reflects the iterative nature of aircraft development, where failures are analyzed and corrected to improve safety. For ATCs, the event also emphasizes the need for effective emergency response coordination, as ground personnel were also at risk. Today, safety management systems (SMS) and crew resource management (CRM) are direct outcomes of such historical lessons, making this story a valuable case study for any aviation professional. Finally, the Armagnac crash serves as a reminder that aviation safety is built on the foundation of past mistakes. For students preparing for ATPL exams or ATC ratings, studying historical accidents provides context for modern regulations and best practices. It reinforces the idea that every flight, whether a routine commercial operation or a test flight, requires vigilance, thorough preparation, and adherence to procedures—principles that remain as relevant today as they were in 1950.