Collision with terrain not working

Hey

I’m developing a Jet Shooter. Two planes that can shoot at each other. I’ve got the movement from the plane tutorial (Add Actor Transform and Add Actor Rotation).
But this doesn’t collide with the landscape.

It collides with every mesh where ‘Simulates Hit Event’ is ticked but it doesn’t collide with the landscape.
I cannot add this to my landscape (there is no such Tick-Bock).

How can I fix this?

Note: I’ve read that the problem is, that I always set a new position and not move it to another. But I don’t know how I can prevent this. I thought about ‘Move Component To’ with duration=0 but this starts a new Thread every Frame and it doesn’t really work (I’ve tried it many times)

Thanks in Advance