As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IN CRUISE FLIGHT, PILOT AND CREW NOTED A BANG, FOLLOWED BY APPROX 45 SEC TO ONE MINUTE OF VIBRATION. VIBRATION WENT AWAY, AIRCRAFT WAS SAFELY LANDED AT KONA (WINONA MUNICIPAL AIRPORT). UPON POST FLIGHT WALK AROUND, DAMAGE TO YELLOW MR BLADE WAS OBSERVED AND THE MR HUB CAP WAS FOUND TO BE MISSING.