Chopper Ground Resonance?

[FLEXPWR]

A helicopter broke into pieces after touch down, due to some sort of "ground resonance".

Link here (in French):
Un hélicoptère se désintègre littéralement - Yahoo! (http://fr.news.yahoo.com/un-helicoptere-se-desintegre-litteralement.html)

Anyone familiar with this phenomenon? Seems there was no defect prior to the event.

[Senior Pilot]

Ground resonance is a well known helicopter phenomena, and can catch the unwary. Discussion about this event and how to handle it in Rotorheads (http://www.pprune.org/rotorheads/478022-as350-ground-resonance-video.html) :ok:

[FLEXPWR]

Thanks a lot,

Never seen it before, although obviously it's a well documented occurence.

Flex