HelistatGear
That was my point, Hillberg. Instead of the normal landing gear, which incorporates a damper, the Helistat was hard mounted on wheels. The S-58 landing gear is a part of the mechanical instability attenuating system, along with the main rotor dampers. Sometimes the onset of that sort of instability is exceedingly rapid, so that just retarding the throttles and applying a rotor break simply takes too long, leaving the alternative of grabbing a handful of collective and applying it NOW is the only salvation. My recollection of the accident footage showed a fairly slow attempt to lift to hover, but structural failure had already commenced.