俄直升机事故致5人死亡，含能源专家

Group 1 - The helicopter crash in the Republic of Dagestan, Russia, resulted in the deaths of five employees from the Kizilyar Electromechanical Plant, including key technical and management personnel [1][3] - The helicopter crashed on November 7 while en route to a vacation base, hitting an uninhabited building and catching fire [1] - The victims included the plant's deputy general manager, chief engineer, chief energy expert, helicopter chief designer, and a mechanic who died after being hospitalized [1] Group 2 - The Russian Federal Investigative Committee is examining potential causes of the crash, including pilot error and technical malfunctions, with indications that the engine may have caught fire during flight [3] - The Kizilyar Electromechanical Plant has been in operation for over 60 years, primarily producing helicopter components, airport ground support systems, and civil derivative equipment [3]