Well, after thinking about overlap events and landscape - taking into account what engine would have to do to find overlaps and the amount of the events that would be dispatched because of the amount of objects you can have scattered around landscape, I can safely conclude that it’s not possible.
I don’t see any ways how physical forces can be reset except switching Simulate Physics on/off. Which might be an option. Otherwise I have to detect “collision” with landscape using RayTrace, which have to be done separately for each wing, fuselage, tail and etc. sound like a potential performance hit.
I’ll try switching Simulate Physics on/off and see how it works.