Ground is flickering

Hi Everyone,

I created the ground of my airport in Blender. You can see this "Mesh" in MCX here:

Later on I imported it as a Library Object into ADE and then I saw that the Mesh was flickering in FSX.

So, how can I use my Mesh as a normal ground?

And my second problem is that I want to have the default FSX runway and approuch lights for my airport.

So, I created a runway and set up all the lights settings, but now I want the runway to disappear in FSX so that you can only see my runway.

Thanks in advance,