missing parts of the model

Models created prior to FSX sp2 frequently suffer this problem.

Thank you very much. However not everyone is experiencing this problem
and I am not alone either. There are two versions of the same plane one civilian sales demo and military veersion. The civilian is all intact, only the militar version has this problem. Well thnk you anyway. greatly appreciated.

Whats the plane, where did you get it?

http://speed99.webhosting.klfree.net/class/witex/endownload.html
This was the original site. But I found it on 2 other sites same result.

They could be too graphic intensive for your video card is it's an older card.
Reduce most of the slides (as an experiment) leaving all the "power" of it (the card) to use on the aircraft, no scenery nothing all on low or off.
If the aircraft looks and flies great then it's your card.