As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PISTON CYLINDER BECAME SEPARATED FROM THE HUB. IT APPEARS THAT THE THREADS STRIPPED OUT OF THE HUB ABOUT 1/8 INCH. AT THIS TIME WE ARE SENDING TO H&S PROPELLER IN MICHIGAN FOR AN DETAILED TEAR DOWN INSPECTION REPORT TO DETERMINE THE FAILURE.