Failure of the tail rotor mechanism caused the October 27 helicopter crash in which owner of Leicester City Vichai Srivaddhanaprabha and four others died.
The crash occurred outside the King Power Stadium in the central English city after a Premier League match.
“The evidence gathered to date shows that the loss of control of the helicopter, resulted from the tail rotor actuator control shaft becoming disconnected from the actuator lever mechanism,” a report by the investigators read.
The aircraft reached an altitude of approximately 430 feet before veering to the right and plummeting to the ground just outside the stadium.
The investigation continues into other factors that may have contributed to the crash, the report concluded.
Others involved in the crash were pilot Eric Swaffer, his partner and co-pilot Izabela Roza Lechowicz as well as two members of Vichai’s staff, Nusara Suknamai and Kaveporn Punpare.