What happened
On December 1, 2005, a BELL 206 L4T helicopter, registration EC-HCT, operated by Helisureste, S.A., was performing aerial observation and support duties in Móstulent, Spain. After completing an initial flight, the aircraft returned to the Móstoles bullring to pick up passengers, including public figures.
During the second takeoff from the bullring, the aircraft began a vertical ascent but quickly initiated a rightward turn around its vertical axis. As the helicopter gained altitude, it entered a rapid descent, striking the exterior wall of the bullring before impacting the ground. The impact caused the aircraft to capsize on its left side. While the crew and passengers survived, the aircraft was destroyed, and two passengers sustained minor injuries.
The investigation
The CIAIAC investigation examined the aircraft's mechanical condition, the pilot's training, and the environmental factors at the time of the accident. Investigators found no evidence of mechanical failure or engine malfunction; bench tests confirmed both engines were capable of producing sufficient power.
However, the investigation revealed that the aircraft was operating in a highly unstable configuration. The helicopter was flying in a confined area with significant wind conditions. Furthermore, the investigation scrutinized the pilot's recent training history and the operator's weight and balance procedures.