16 October 2003 MD900 Explorer N179PA operated by Papillon Grand Canyon Helicopters on behalf of the US National Parks Service in the Grand Canyon National Park. Report that the aircraft suffered a ‘Notar’ failure and crashed.
The NTSB concluded that the accident in FREDONIA, AZ had a probable cause:
the pilot's in-flight loss of control due to the fatigue fracture and separation of the force limiting control rod (an integral part of the anti-torque system), which resulted in the helicopter's uncommanded yaw/spin and subsequent collision with terrain. It was all low speed so they all walked away from it.
There was also another 900 D-HITH in Germany that was unable to overcome a gusting wind in March 2005 and toppled over, I guess that could be seen as a Notar failure.
I am not sure that Notar can be hiding behind an excuse that it is a young system anymore, depending what date you go by you get at least 15 years, more really. The development numbers are low though, something like 220-230 Notars in all out there?