Rigga, so true. Unless you work on some Agusta (or whoever they are now) products, then you'll find this little gem in the MM Introduction: "This manual provides the best possible instructions but it is not a substitute for sound judgement."
Love it.
Grant1978. The OEM manuals are approved by each aviation authority and are the only manuals that are approved for the maintenance of the helicopter. Every aircraft is delivered with a complete set of Manuals. English is the standard language, but for countries where English is not mandated in Aviation (Brazil for instance) then Manuals in the appropriate language are supplied.
Most are now delivered on DVD or by electronic download. Paper Manuals are expensive to make and to maintain, so they are nearly all gone now.
Hope that helps