FS2004 can be used to practice autorotations but you have to do
something a little unrealistic and after killing the throttle bring it
back to between 10 and 20 percent. Yes it's a nasty kludge but people
do use this method. Here's a good article on doing autorotations in
FS2004.

http://www.hovercontrol.com/artman/p...ticle_18.shtml