The first prototype P.108B flew on 24 November 1939. It performed extremely well in a series of tests and required refining in only a few minor areas, but it took some time for pilots to get used to the new aircraft. The P.108 was delivered to a single unit, the 274a "Squadriglia" (274th Squadron), in 1941. But there were several accidents, one of them involving the son of Italian dictator Benito Mussolini. On 7 August 1941, Bruno Mussolini, commander of the 274a " Squadriglia", was piloting one of the prototypes of the "secret" bomber. He flew too low and crashed into a house. The cockpit section separated from the rest of the aircraft and although the aircraft did not catch fire, it was nevertheless totally destroyed in the impact. Commander Bruno Mussolini died from his injuries.