Bog of Allen Heli Crash
So in the U.K., practice autorotations must be done at airports. Easy enough, right? Only...in the real world, engines don't always quit at airports. So flight instructors like to put their students in "real world" situations. "Where would you go if the engine quit NOW?" they ask, chopping the throttle and initiating an autorotation and allowing the student to take it all the way down to a power-recovery. They don't touch down, of course - just get it low enough to assure the successful outcome.