What happened
On 5 June 2003, a medical transport flight was conducting a landing at the University Hospital heliport in Linköpping, Sweden. The aircraft, an MBB BK 117B-2 with registration SE-JUL, was performing a Category A approach, a maneuver characterized by a relatively steep descent toward the touchdown area. During the landing sequence, the helicopter's movement generated intense turbulence. This sudden gust of wind was powerful enough to knock over a woman walking near the heliport perimeter, resulting in a fractured hip.
The investigation
The Swedish Accident Investigation Board (SHK) examined the circumstances surrounding the incident, including the heliport's configuration and the flight operations. The investigation confirmed that the helicopter was being operated in accordance with all prevailing regulations. Furthermore, the SHK found that the heliport itself was laid out according to the regulatory standards in effect at the time of the accident. The inquiry focused on the physical forces produced by the aircraft during its approach and the lack of protections for bystanders.
Findings
The investigation concluded that the primary cause of the injury was the strong wind forces created by the helicopter's landing process. While the flight and the facility met all legal requirements, the SHK identified a significant safety gap: existing regulations for heliport design and management do not sufficiently account for the safety of people or property located in the immediate vicinity of the landing area.
Safety action
To prevent similar injuries, the SHK recommended that the Swedish Civil Aviation Administration work with relevant authorities to disseminate information regarding these wind-related risks. The board specifically suggested that regulations governing the layout and management of heliports be updated to better protect bystanders and nearby equipment from the aerodynamic disturbances caused by arriving and departing aircraft.