N955B
BELL 47G
THE STUDENT PLT WAS ON AN APCH TO LAND ON A X-COUNTRY FLT, WHEN THE AFT TAIL ROTOR DRIVE SHAFT (PN: 47-644-187) FAILED AT ABOUT 40' AGL. HE RPRTD THE HELICOPTER BEGAN TO SPIN TO THE RIGHT, SO HE CLOSED THE THROTTLE & THE SPINNING STOPPED. HE PULLED UP ON THE COLLECTIVE TO CUSHION THE LANDING, BUT RAN OUT OF COLLECTIVE PITCH AT ABOUT 10' ABOVE THE GROUND. SUBSEQUENTLY, THE HELICOPTER TOUCHED DOWN HARD, DAMAGING THE TAIL ROTOR & TAIL BOOM. THE TAIL ROTOR DRIVE SHAFT HAD FAILED JUST FORWARD OF THE 90 DEG GEAR BOX.
FAILURE OF THE AFT TAIL ROTOR DRIVE SHAFT.
Source: NTSB Aviation Accident Database
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