With regards to CAR 305, basically it is saying "Access to any place, AND, in particular: An aerodrome (Not an ALA) AND an authorised activity is occurring (Flying School, Maintenance etc) AND access to any aircraft (at a reasonable time) to inspect that aircraft. All the AND's in there logically means that all of those conditions must be met to allow the access, i.e it MUST be an aerodrome (Certified, Registered or RPT or Charter at least once a week), it MUST have either a LAME, GA School or other CASA Approved activity before they can walk in and inspect an aircraft at a reasonable time. This is how I read it but it's quite possible that lawyer logic is different...