Fantastic scenery, I thoroughly enjoy flying in and out of there, it can be a bit hairy in the 747 though

I have a question, I have seen a few screen shots where other users have made the sand blow as if they are throttling up and making the sand blow as in real life, but I can't seem to get this to happen.
I take it that I am doing something wrong, so I thought I would ask the experts.
Many thanks.