As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ENGINE HAD A PROPELLER STRIKE INSPECTION WITH NO DAMAGE FOUND TO CRANKSHAFT. ENGINE WAS PUT BACK INTO SERVICE, CRANKSHAFT DEVELOPED A CRACK IN THE PROPELLER FLANGE. CRACK PROPAGATED FROM A SUBSURFACE DEFECT THAT WAS UNDECTED BY MAGNETIC PARTICLE INSPECTION.