What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
(-23) While in hover, tail potor drive shaft became disconnected from drive quill of main transmission due to excessive wear in upper drive shaft-joint splines. Helicopter had started to rotate when pilot began recovery procedure and right skid dug into ground. Causing rollover.
As the FAA filed it
(-23) WHILE IN HOVER, TAIL POTOR DRIVE SHAFT BECAME DISCONNECTED FROM DRIVE QUILL OF MAIN TRANSMISSION DUE TO EXCESSIVE WEAR IN UPPER DRIVE SHAFT-JOINT SPLINES. HELICOPTER HAD STARTED TO ROTATE WHEN PILOT BEGAN RECOVERY PROCEDURE AND RIGHT SKID DUG INTO GROUND. CAUSING ROLLOVER.
NTSB investigation
The NTSB’s investigation of this event, with its probable cause and findings. Matched to this report by N-number and date.