Paul,
Capt. Jean LeGrand was in Firefly Y-10 on 27 Oct (not Dec) 1932. Wing broke off in dive towards the Breguet. LeGrand parachuted safely.
Incident was widely covered in Belgian press, questioning the quality of the wing construction of the Firefly.
See (in Dutch):
https://luchtvaartgeschiedenis.be/co...n-jean-legrand
Regards,
Leendert