This is a Notable Operational milestone.
The aircraft was piloted by Jean Boulet, then a recently graduated test pilot, as the Chief Test Pilot was too heavy for the aircraft to get off the ground. Boulet would go on to become one of France's most famous rotorcraft test pilots.
Source: "SNCASE S.E. 3101 Helicopter", Jacques Virasak, VFS web page, Last accessed, Feb 26, 2020