What happened
On 22 April 2025, at approximately 0930 local time, an HH60W helicopter, tail number 21-4513, performed an aerial demonstration at Kadena Elementary School on Kadena Air Base, Okinawa, Japan. The event was part of a celebration for the "Month of the Military Child." The aircraft, operated by the 33rd Rescue Squadron of the 18th Wing, approached a designated landing zone near civilian spectators.
During the approach, the rotor wash generated by the helicopter's blades impacted a civilian spectator. The individual was holding an umbrella on her left arm; the wind from the aircraft caused the umbrella to expand, which subsequently pulled the victim off balance. This force caused her to fall onto a concrete walkway, resulting in severe head injuries. Although emergency medical personnel transferred the victim to U.S. Naval Hospital Okinawa, she passed away on 27 April 2025. There were no other fatalities or significant injuries reported during the incident.
The investigation
The Accident Investigation Board examined video evidence and witness testimony regarding the aircraft's proximity to the crowd and the environmental factors at play. Investigators reviewed the mission planning processes, the oversight of the event, and the specific mechanics of how the rotor wash interacted with the victim's belongings. The board also evaluated the operational mindset of the aircrew and the adherence to established safety distances outlined in Air Force Instruction (AFI) and the event's concept of operations.
Findings
- Insufficient distance between the HH60W and the victim was identified as the primary cause of the mishap.
- The expansion of the umbrella, combined with the victim's age, significantly reduced her ability to withstand the force of the rotor wash.
- Failures in mission planning and inadequate oversight allowed for a deviation from required spectator safety distances.
- An operational mindset characterized by a false sense of security contributed to the incident, as the crew viewed the flight profile as routine and did not sufficiently consider the risks to civilians.