EC135 Autos
The problem here are the so called `control-cuffs`.
These cuffs meassure approx. 6 ft in length and start at the blade root . At the outer point there are attached to the composite blade. They are responsible to transfer control inputs to the bearingless blade.
They can be easily overstressed during autos with low rpm
(e.g. cushion touchdown) due to the coning of the rotor.