What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
(-16) Tail rotor drive shaft failed due to the loss of a bolt and associated hardware that secures the shaft to a drive coupling. The bolt, washers, and nut were not recovered. The cause of the loss of the hardware has not been determined at this time. The drive shaft assembly has been shipped to the rotorcraft certification office (ASW-170) for further evaluation. The FAA investigation is ongoing.
As the FAA filed it
(-16) TAIL ROTOR DRIVE SHAFT FAILED DUE TO THE LOSS OF A BOLT AND ASSOCIATED HARDWARE THAT SECURES THE SHAFT TO A DRIVE COUPLING. THE BOLT, WASHERS, AND NUT WERE NOT RECOVERED. THE CAUSE OF THE LOSS OF THE HARDWARE HAS NOT BEEN DETERMINED AT THIS TIME. THE DRIVE SHAFT ASSEMBLY HAS BEEN SHIPPED TO THE ROTORCRAFT CERTIFICATION OFFICE (ASW-170) FOR FURTHER EVALUATION. THE FAA INVESTIGATION IS ONGOING.
NTSB investigation
The NTSB’s investigation of this event, with its probable cause and findings. Matched to this report by N-number and date.
Other reports on N57536 · 1
Matched to the same aircraft by N-number and date.