The requirement for an Australian Security Identification Card (ASIC), was a gross overreaction by our Government to the Twin Towers, New York, terrorist attack 11/11/2001, 25 years ago.
ASIC is part of a parcel of upgraded security legislation, which included a requirement for Regular Passenger Transport (RPT) airport owners (mostly Councils) to commit to enhanced security requirements (fencing/gates etc). Despite it being without any merit (for small regional airports) it has been continued (with little resistance from the private aviation community?????).
RPT airports are designated Security Controlled Airports (you will see something to this effect in ERSA), Anyone wishing unescorted access to the operational side of the airfield, is required to hold a current ASIC
Private pilots wishing to access a Security Controlled Airport, will require an ASIC, if they wish to comply with the law (I believe there may bea $5,000 fine for non compliance - in the unlikly chance you get caught)
The NEED, for private pilot, wishing to access most regional airports, to have an ASIC is a completely artificial/unnecessary construct, by the Federal Government, for no good purpose.
The rules governing access to these airports are positively torturous eg as a PIC you can land without an ASIC but may not exit your aircraft without being escorted by someone who has an ASIC.
Airports without RPT activity, do not legally require a pilot to hold/display an ASIC. So some airfields, with far greater aircraft movements, do not legally require ASIC (go figure!)
Along with many private pilots, I acquired an ASIC when they came in. In the following 5 years, I never once was asked for it - a common experince.
Small regional RPT airports often only give "lip service " to the legislation eg ineffectual security fencing, gate access codes publicly available, no security personnel, etc.
The issuing of ASIC has been farmed out to the private sector - you now apply through a third party, who must make a profit ie increased cost to the pilot
You can not use your ASIC clearance for any other purpose other than airport access ie its no good as a photo ID, etc
Note:
There are diffrent "grades" of ASIC - as pilot requiring unrestricted access to certain areas of an airfield eg fuel bowsers, you will need a Red ASIC.
Having an ASIC, confers only limited access, on an airfield ie you can not necessarily access all areas, particularly those in proximity to RPT aircraft/activities.
The rules around ASIC have evolved over time - I may or may not have covered all salient points.
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