Also do the F/As hold ASIC cards as they are accessing restricted areas at Australian airports ?
Foreign crews (including F/As) are not required to display ASICs in secure areas, an airline ID and uniform are sufficient. The lawful reason for entry requirement also applies.
From the Aviation Transport Security Regulations:
3.05 Crew of foreign and state aircraft etc
Despite regulation 3.03, the following people need not display
an ASIC in a secure area:
(a) a person who is a member of the crew of a foreign aircraft
(other than a state aircraft) that is engaged in a regular
public transport operation or a charter operation and who:
(i) is in the uniform of the aircraft operator; and
(ii) displays appropriate identification issued or
authorised by the aircraft operator: