You asked for it .....
[My comments are in italics.]
Document Set
2.1 The document hierarchy consists of:
(a) the Civil Aviation Act 1988 (the Act);
(b) relevant Civil Aviation Safety Regulations (CASRs);
© the Manual of Standards (MOS); and
(d) Advisory Circulars (ACs).
2.2 The Act establishes the Civil Aviation Safety Authority (CASA) with functions relating to civil aviation, in particular the safety of civil aviation and for related purposes.
2.3 CASRs establish the regulatory framework (Regulations) within which all service providers must operate.
2.4 The MOS comprises specifications (Standards) prescribed by CASA, of uniform application, determined to be necessary for the safety of air navigation. In those parts of the MOS where it is necessary to establish the context of standards to assist in their comprehension, the sense of parent regulations has been reiterated.
2.5 Readers should understand that in the circumstance of any perceived disparity of meaning between MOS and CASRs, primacy of intent rests with the regulations.
2.6 Service providers must document internal actions (Rules) in their own operational manuals, to ensure the maintenance of and compliance with standards.
2.7 ACs are intended to provide recommendations and guidance to illustrate a means, but not necessarily the only means of complying with the Regulations. ACs may explain certain regulatory requirements by providing interpretive and explanatory materials. It is expected that service providers will document internal actions in their own operational manuals, to put into effect those, or similarly adequate, practices.
Civil Aviation Orders support the CARs 1988 (Civil Aviation Regulations). They will be progressively removed as we move to the CASRs 1998.[CAOs were used to amplify the intent and means of complying with the CARs.]
[So you can expect that some time in the future CAO 95 will be replaced by one or more CASRs.]
AC21-41(0) is the Advisory Circular showing how CASR 21 Subpart H can be complied with.
CASR Part 21 subpart H deals with "Certificates of airworthiness (except provisional certificates of airworthiness) and special flight permits." [Including Light Sport Aircraft]
You can see AC21-41(0) at http://casa.gov.au/wcmswr/_assets/main/rules/1998casr/021/021c41.pdf
As you can see it is all a bit of a can of worms but basically Advisory Circular 21-41(0) explains (?) the requirements of CASR 21H and how one can comply with them.
Here endeth the lesson.
Still confused? .... oh well, I did my best.
DWF