Interesting point on the Chinook that rolled..!!
(Possible link, i dont know ??)
I saw recently on Sky the episode of the 737 crash which resulted in the loss of the aircraft and crew. Believed to be caused by wake vortex from a 727 in front. There was a previous crash, that was still unexplained up to this point.
However, a third 737, had a simliar problem. The crew managed to bring the aircraft under control and land safely.
It appears that the rudder made undemanded control inputs.
One theory was the "fat passenger" theory. (No offence to anyone !! )
The idea being that if someone was heavy enough, could they actually cause a sufficient dent in the aircraft floor to cause the controls lines to operate the rudder. This was dispelled.
The fault was eventually traced to a fault in the PCU. (Primary Control Unit ? )
This was "freezing" at a certain point and in effect caused the crew to try to operate the rudder in the wrong direction, thereby increasing the yaw angle further the wrong way and putting themselves in a situation that was unrecoverable !!
Not being from an engineering background, could this be a link ?
I would expect the systems on fixed wing and rotary to be different, however, 737 and Chinook both Boeing !!