What you are seeing as far as I know is a level of detail (LOD) model switch. The textures are there, just not the reflective ones. This happens in FSX as well with not just this, but many different models from many different companies. This is normal. Not sure if it can be changed, but the model itself, I very seriously doubt it.
Thanks for the pointer. I must stress though that it's not only the reflective texture that didn't show, as the whole plane shows up in a dark green, not even silver. And this happens when it's rather near to the tower, only loading up occasionally when it gets real near to the tower.
I have not observed this in any other payware add-on that I own.