What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
The aircraft was being flown in support of powerline maintenance work operating from an off airport landing zone and conducting part 133 class b cargo delivery. At approximately 1400 hrs local time, an intermittent and unusual vibration was noted in the aircraft, and the aircraft was landed at the landing zone and shut down for inspection. While awaiting the company mechanic to arrive, the chief pilot and pilot in command inspected the rotor system and immediately noted a chord wise crack near the root of the yellow rotor blade. The operator replaced all main rotor blades and returned the aircraft to service 09/13/2024. On 09/13/2024 the NTSB was notified of the failure and initiated an accident investigation. NTSB contacted operator of aircraft and requested subject blades be sent to NTSB lab for analysis. NTSB results pending. Operator director of maintenance submitted NTSB form 6120-1 dated 09/18/2024 to NTSB.
As the FAA filed it
THE AIRCRAFT WAS BEING FLOWN IN SUPPORT OF POWERLINE MAINTENANCE WORK OPERATING FROM AN OFF AIRPORT LANDING ZONE AND CONDUCTING PART 133 CLASS B CARGO DELIVERY. AT APPROXIMATELY 1400 HRS LOCAL TIME, AN INTERMITTENT AND UNUSUAL VIBRATION WAS NOTED IN THE AIRCRAFT, AND THE AIRCRAFT WAS LANDED AT THE LANDING ZONE AND SHUT DOWN FOR INSPECTION. WHILE AWAITING THE COMPANY MECHANIC TO ARRIVE, THE CHIEF PILOT AND PILOT IN COMMAND INSPECTED THE ROTOR SYSTEM AND IMMEDIATELY NOTED A CHORD WISE CRACK NEAR THE ROOT OF THE YELLOW ROTOR BLADE. THE OPERATOR REPLACED ALL MAIN ROTOR BLADES AND RETURNED THE AIRCRAFT TO SERVICE 09/13/2024. ON 09/13/2024 THE NTSB WAS NOTIFIED OF THE FAILURE AND INITIATED AN ACCIDENT INVESTIGATION. NTSB CONTACTED OPERATOR OF AIRCRAFT AND REQUESTED SUBJECT BLADES BE SENT TO NTSB LAB FOR ANALYSIS. NTSB RESULTS PENDING. OPERATOR DIRECTOR OF MAINTENANCE SUBMITTED NTSB FORM 6120-1 DATED 09/18/2024 TO NTSB.
NTSB investigation
The NTSB’s investigation of this event, with its probable cause and findings. Matched to this report by N-number and date.