idle stop I know what you are talking about, I had the experience in one 412 and I thought it was going to self destroy
I believe the possibility of ground resonance in a 412 although very remote , exists.
The dampers , rubber in the crosstube, or one drop restrainer not in locked position after the previous shutdown... something can fail.
Maybe a pilot react intending to lift the helicopter and find himself hitting a nearby tree... ?
What do you think guys?
Ned-Air2Air: The machine is fine , I was just speculating about something I heard...
Thanks for your responses