thanks for suggestion but it's expensive.
That's due to copyright, intellectual property (IP) and the work, effort, and cost which goes into producing any documents. Doesn't matter whether we are talking aircraft documents, music CDs, or movie DVDs, etc...
Keep in mind that, quite apart from the legal side of things, every time you pinch someone's work without paying for it you add a nail in the coffin of its (or something similar's) being available to you next time .. it can be a bit of a vicious circle.
Very much like always buying at the cheaper big supermarket and bypassing the corner store ... and then being upset when the corner store closes because the business went broke and you MUST go to the supermarket.
Short sighted thinking, I suggest.