AS = Australian?
I know AS as = Aerospace, as in AS9100, AS9102, AS9145, AS13100, and more. The first at least is fairly easy to get a copy of via basic torrenting; current rev is D.
The "easiest" way to get a copy is to be in industry and use your company's resources to obtain a copy.
AS9100 is the "base" and it is just ISO9001 + some extra aerospace-specific additions.