As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE SIX A2513-92 PROPELLER MOUNTING BOLTS ARE APPROX .250 INCHES TOO SHORT. THEY ARE THREE THREADS TOO SHORT FROM BEING FLUSH WITH THE BACK SIDE OF THE PRESSED IN NUT ON CRANKSHAFT FLANGE. A LONGER BOLT (APPROX .250 IN) WOULD CORRECT THIS PROBLEM. THIS AIRCRAFT AND ANOTHER NEW (172S MODEL) HAVE THIS DEFECT. THE NUT IS THIN AT THE POINT WERER IT GOES THROUGH THE CRANKSHAFT FLANGE AND ONLY A FEW THREADS CATCH THE BACKSIDE(FAT PART) OF THE NUT.