I don't usually get around helicopters (I figured out 40 years ago they will fall on you . . . . . and if you paint 'em green, people are likely to shoot at you and then they fall on you) but I just found this site and thought there might be someone here might find interesting.
www.tpub.com/aviation1.htm
It's copies of the TMs (Operators and Maintenance manuals) for the AH Cobra, the AH Apache, the Chinook and OH Series helicopters. Might be handy for detailing and correcting.