Helicopter in crash that killed Leicester City owner lost control after mechanism linking pilot's pedals with tail rotor blades became disconnected

The helicopter carrying the owner of Leicester City lost control after a mechanism linking the pilot's pedals with the tail rotor blades became disconnected, investigators said.

Five people including Leicester City football club's owner  Vichai Srivaddhanaprabha died after the helicopter spiralled out of control and crashed at the King Power stadium in October.
Leicester helicopter crash
Investigators found the pilot's pedals became disconnected from the tail rotor and caused the aircraft to make an uncontrollable right turn before it spun and fell, hitting the ground in a ball of flames.
The pedals and tail rotor are linked by a mechanism which failed after parts of it had become disconnected and there was a "build-up of black grease" on one component.
Leicester helicopter crash
The failure led to the pitch of the tail rotor blades being changed "until they reached the physical limit of their travel", investigators said.
The report stated: "The initiating cause and exact sequence of the failure that resulted in the loss of tail rotor control is being investigated as a priority."
Leicester helicopter crash
The report said: "The tail rotor actuator control shaft became disconnected from the actuator lever mechanism.
"The disconnection stopped the feedback mechanism for the tail rotor actuator from operating and the tail rotor actuator from responding to yaw control inputs."
This loss of the feedback mechanism meant the yaw stops were ineffective and the tail rotor actuator was able to continue changing the pitch of the tail rotor blades "until they reached the physical limit of their travel".