As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DRIVESHAFT CAUSED HIGH FREQUENCY VIBRATION DURING EXTERNAL LOAD OPERATIONS. DRIVESHAFT FAILED COMPLETELY AFTER APPROXIMATELY ONE MINUTE WHILE AIRCRAFT WAS RETURNING TO ITS LANDING AREA. AIRCRAFT SUSTAINED HARD LANDING WITH NO PILOT INJURIES.