http://www.dotars.gov.au/transport/s...eet/fact9.aspx
Access requirements at security controlled airports
Whether your aircraft flies to a small or a large airport in Australia, you will need to check the access requirements for the airside area of that airport.
If you fly to a security controlled airport which has regular public transport (RPT) services - and there are now many more of these airports as a result of the new laws - access to the airside of the airport is restricted to only those people that need to be there. You must have a special identity card known as an aviation security identification card or ASIC. The ASIC is required in addition to any photographic flight crew licence or special pilot's licence issued by CASA as needed.
If you don't have an ASIC, you will need to check if the airports into which you fly are classified as security controlled airports. You will then need to check with the airport operator what the ASIC requirements are at these airports.