What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
On 3-16-2010 omniflight helicopter N4282, s/n 4282 located at la paz regional Hospital, Parker, AZ sustained damage to one main rotor blade, right side of tailboom and lower vertical fin. The damage occured due to a 12" crescent wrench being left on or near the main rotor blade sleeve. The omniflight mechanics, privacy data omitted and privacy data omitted were performing maintenance due to a pilot report of vibration. The mechanics had made adjustments to blade weights, trim tabs and collective rod lenghts. The wrench was slung back upon rotation of the main rotor, thus impacting the leading edge of "red" blade, striking the tail boom and finally hitting the lower vertical fin. The pilot nor mechanics were injured and there was no damage to any surrounding structures. The aircraft was then taken out of service for repairs. The wrench was not found according to statements.
As the FAA filed it
ON 3-16-2010 OMNIFLIGHT HELICOPTER N4282, S/N 4282 LOCATED AT LA PAZ REGIONAL HOSPITAL, PARKER, AZ SUSTAINED DAMAGE TO ONE MAIN ROTOR BLADE, RIGHT SIDE OF TAILBOOM AND LOWER VERTICAL FIN. THE DAMAGE OCCURED DUE TO A 12" CRESCENT WRENCH BEING LEFT ON OR NEAR THE MAIN ROTOR BLADE SLEEVE. THE OMNIFLIGHT MECHANICS, ^PRIVACY DATA OMITTED^ AND ^PRIVACY DATA OMITTED^ WERE PERFORMING MAINTENANCE DUE TO A PILOT REPORT OF VIBRATION. THE MECHANICS HAD MADE ADJUSTMENTS TO BLADE WEIGHTS, TRIM TABS AND COLLECTIVE ROD LENGHTS. THE WRENCH WAS SLUNG BACK UPON ROTATION OF THE MAIN ROTOR, THUS IMPACTING THE LEADING EDGE OF "RED" BLADE, STRIKING THE TAIL BOOM AND FINALLY HITTING THE LOWER VERTICAL FIN. THE PILOT NOR MECHANICS WERE INJURED AND THERE WAS NO DAMAGE TO ANY SURROUNDING STRUCTURES. THE AIRCRAFT WAS THEN TAKEN OUT OF SERVICE FOR REPAIRS. THE WRENCH WAS NOT FOUND ACCORDING TO STATEMENTS.
NTSB investigation
The NTSB’s investigation of this event, with its probable cause and findings. Matched to this report by N-number and date.