Isn't there also a requirement for the landing gear to be fitted with dampers, or to be on wheels (one tyre to be under-inflated) with oleos that are out of adjustment.
Most teetering head helos are on skids on crosstubes, which are not really susceptible to GR. However, a really ham-fisted pilot might be able to get it. Squirrels (different head) could bounce easily on those blades at the back of the skids.