What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
The helicopter was on a flight after maintenance for a stabilizer and tr servo changes. After the flight the mechanic and the pilot noticed that a main rotor blade and the tail boom had damage. The pilot reported he did not notice any irregularities during the flight. Pictures of the damaged rotor blade depict that some unknown object impacted the blade from below. The unkown object appeared to hit in the center of the blade. The blade lower surface had impact damage and the composite skin was missing 3 inches of skin and had some honeycomb core damage. The tail boom had impact damage on the upper surface that appears to be the ricochet from the main rotor blade impact. The damage to the helicopter blade and tail boom could not be determined through our investigation.
As the FAA filed it
THE HELICOPTER WAS ON A FLIGHT AFTER MAINTENANCE FOR A STABILIZER AND TR SERVO CHANGES. AFTER THE FLIGHT THE MECHANIC AND THE PILOT NOTICED THAT A MAIN ROTOR BLADE AND THE TAIL BOOM HAD DAMAGE. THE PILOT REPORTED HE DID NOT NOTICE ANY IRREGULARITIES DURING THE FLIGHT. PICTURES OF THE DAMAGED ROTOR BLADE DEPICT THAT SOME UNKNOWN OBJECT IMPACTED THE BLADE FROM BELOW. THE UNKOWN OBJECT APPEARED TO HIT IN THE CENTER OF THE BLADE. THE BLADE LOWER SURFACE HAD IMPACT DAMAGE AND THE COMPOSITE SKIN WAS MISSING 3 INCHES OF SKIN AND HAD SOME HONEYCOMB CORE DAMAGE. THE TAIL BOOM HAD IMPACT DAMAGE ON THE UPPER SURFACE THAT APPEARS TO BE THE RICOCHET FROM THE MAIN ROTOR BLADE IMPACT.THE DAMAGE TO THE HELICOPTER BLADE AND TAIL BOOM COULD NOT BE DETERMINED THROUGH OUR INVESTIGATION.