As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE PROPELLER MOUNTING BOLTS ON NEW AC MODEL SEEM TO BE TOO SHORT. THEY DO NOT EXTRUDE AT ALL THRU THE CRANKSHAFT PRESSED THREADED BUSHINGS. USUALLY THE THREADS WILL EXTRUDE 2-3 THREADS THRU THE BUSHING. RECOMMENDATION IS TO HAVE A LONGER BOLT INSTALLED SO THE THREADS EXTRUDE ALL THE WAY THRU THE CRANKSHAFT BUSHINGS AT LEAST 3 THREADS.