Joseph wrote on Jun 21^st, 2009 at 12:33pm:

I set-up the course, ILS frequeny and on the approach, I engaged the approach button. At this point, the plane turns as if to approach the runway, but falls drastically out of the sky.  I don't have any problem with other planes I fly, using this procedure...please, what am I doing wrong with the C-130? :'(

i think this may help you. search in the kb:417 and read it.
if not you say that its in the glide slope but not keeps on the glide slope?