As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING POWER CHANGE IN PATTERN, PROPELLER DEPARTED AIRCRAFT. EXAMINATION OF ALL SIX .25 INCH BOLTS REVEALED THEY HAD FAILED AT A POINT FLUSH WITH CRANKSHAFT FLANGE. ALL APPEARED TO HAVE BEEN OVERTORQUED AT INSTALLATION ONLY 11 HOURS PRIOR. SUGGEST OPERATOR OF ROTAX ENGINES USING .25 INCH PROPELLER BOLTS CHECK FOR CONDITION AND PROPER TORQUE.