5N-AJL
I will not get involved in character assassinations online, but can confirm it was a bolt on one side of the scissor assembly (above the swash plate) that failed, leading to one main rotor blade being uncontrolled in flight. The sequence of events as posted by SASless in his first 2 lines is incorrect.
Chris Cairns (passenger in LHS cockpit) exited underwater through open door. A Belgian or French passenger, with a Nigerian passenger alongside exited cabin on left side. 4th survivor, another Nigerian, apparently jumped out of a removed cabin window on the right side as the fuselage hit the river at Onne port.
For those who question doing HUET drills, I had done one 6 weeks prior to this accident, with an American and a Canadian helicopter pilot, in Norwich. It can help save you life.