What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
(-23)The flight crew felt a shutter and vibration from the aircraft shortly after takeoff from an offshore platform. The flight crew returned to the platform and landed without incident. Subsequent inspection of the aircraft revealed that one set of tail rotor counter weights were missing and one tail rotor blade had significant leading edge damage. Further evaluation that the counter weight bellcrank mounting stud on the tail rotor crosshead failed at the cotter pin hole. The failed crosshead was sent to the manufacture for engineering evaluation was corrdinated with the FAA rotorcraft certification office (ASW-170).
As the FAA filed it
(-23)THE FLIGHT CREW FELT A SHUTTER AND VIBRATION FROM THE AIRCRAFT SHORTLY AFTER TAKEOFF FROM AN OFFSHORE PLATFORM. THE FLIGHT CREW RETURNED TO THE PLATFORM AND LANDED WITHOUT INCIDENT. SUBSEQUENT INSPECTION OF THE AIRCRAFT REVEALED THAT ONE SET OF TAIL ROTOR COUNTER WEIGHTS WERE MISSING AND ONE TAIL ROTOR BLADE HAD SIGNIFICANT LEADING EDGE DAMAGE. FURTHER EVALUATION THAT THE COUNTER WEIGHT BELLCRANK MOUNTING STUD ON THE TAIL ROTOR CROSSHEAD FAILED AT THE COTTER PIN HOLE. THE FAILED CROSSHEAD WAS SENT TO THE MANUFACTURE FOR ENGINEERING EVALUATION WAS CORRDINATED WITH THE FAA ROTORCRAFT CERTIFICATION OFFICE (ASW-170).