Helideck Ground Resonance

[Treg]

We were advised by a trainee today that an HLO and his assistants had to leave a helideck quickly (he were passing the pilot the manifest, HDA's unloading baggage) as the skidded helicopter left the deck to avoid/prevent ground resonance developing/worsening. Anybody know anymore, apparently it was pretty recent?

No more details, sorry.

[levo]

Hi there there is a vid on youtube of a gazelle on a helipad with groun resinance.