Chaps, most of what is being debated here are regulations which do not get debated in Parliament. All regulations stem from an Act of Parliament, in the case in point, The Civil Aviation Act of whatever year.
That Act gives the Gov Gen the power to make regulations for the prescribed purposes set out in the Act. Now, I doubt that Her Excellency spends much of her day worrying about what regulations she should make affecting aviation. However, the regulatory authority, otherwise know as the dark side or CASA will occasionally decide that some regulatory changes should be made. They will set out in a form of instruction as to what they want to achieve and the Parliamentary Counsels' office will put that into an acceptable form. Their job is to both draft the regulation and ensure that its consequences on other legislation is accounted for. They do not have any input on what is contained therein other than to make sure it complies with the existing legislation.
The draft regulation is then tabled (literally, the big table in the centre) in the House of Reps and sits there for a certain number of days (don't ask I can't remember) and if no pollie picks up on it the thing then goes to the Senate for a similar number of days. Same thing there, if not challenged then the thing goes to the GG for enactment and the thing becomes law.
The pollies have next to nothing to do with regulations except those that affect their hobby horses, unfortunately, aviation ain't really one of those.