CLS Piper PA 28R

Good morning all... 
I got the Commercial Level Simulations "CLS" Piper PA 28R-200 Arrow 11 and having a noise problem.
I downloaded it twice but both times when in flight I get this loud rattle or something similiar to that sound.
Can't figure it out.
Looks like a good little bugsmasher but would anyone have or know of a fix for that noise?...
Thanks in advance...Cheers...Doug

I got the Commercial Level Simulations "CLS" Piper PA 28R-200 Arrow 11 and having a noise problem.
I downloaded it twice but both times when in flight I get this loud rattle or something similiar to that sound.
Can't figure it out.
Looks like a good little bugsmasher but would anyone have or know of a fix for that noise?...

Thanks in advance...Cheers...Doug