As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING EXTERNAL LOAD OPERATIONS AT A HOVER, THE ENGINE STOPPED SUDDENLY CAUSING THE PILOT TO AUTOROTATE FROM APPROXIMATELY 120-150 FEET AGL. THE PROBABLE CAUSE OF THE ENGINE STOPPAGE WAS A MALFUNCTION IN THE TURBINE MODULE. NO FINAL REPORT HAS BEEN PUBLISHED.