Please read the regulation below carefully, particularly noting sub-Reg (3) in the context of (2)(g)
CIVIL AVIATION SAFETY REGULATIONS 1998 - REG 99.015
SSAAs to which this Part applies
(1) This Part applies to the SSAAs specified in this regulation.
(2) The specified SSAAs are:
(a) any activity undertaken by a person, other than as a passenger, in an aerodrome testing area; and
(b) calculation of the position of freight, baggage, passengers and fuel on aircraft; and
© the manufacture or maintenance of any of the following:
(i) aircraft;
(ii) aeronautical products;
(iii) aviation radionavigation products;
(iv) aviation telecommunication products; and
(d) the certification of maintenance of a kind mentioned in paragraph ©; and
(da) the issuing of a certificate of release to service for an aircraft or aeronautical product in relation to maintenance carried out on the aircraft or aeronautical product; and
(e) the fuelling and maintenance of vehicles that will be used to fuel aircraft on aerodrome testing areas; and
(f) activities undertaken by an airport security guard or a screening officer in the course of the person's duties as a guard or officer; and
(g) activities undertaken by a member of the crew of an aircraft in the course of the person's duties as a crew member; and
(h) the loading and unloading of trolleys containing baggage for loading onto aircraft and the driving of such trolleys; and
(i) activities undertaken by a holder of an air traffic controller licence in the course of the person's duties as a controller; and
(j) activities undertaken by the supervisor of a holder of an air traffic controller licence in the course of the person's duties as such a supervisor; and
(k) providing flight information and search and rescue alert services:
(i) to a pilot or operator of an aircraft immediately before the flight of the aircraft; or
(ii) to a pilot or operator of an aircraft, during the flight of the aircraft; or
(iii) as an intermediary for communications between a pilot or operator of the aircraft, and an air traffic controller; and
(l) providing aviation fire fighting services.
(3) This Part applies to the safety-sensitive aviation activities specified in paragraphs (2)(b) to (l) even if those activities do not occur in an aerodrome testing area.
So you won't be DAMPED for showing someone your aeroplane airside but you may still have a problem with CAR 256 if you "enter" it or do something which can be construed as acting as a member of the aircrew (checking the tie-downs?) having used...ANY alcoholic liquor or having consumed any in the preceding 8 hours:
CIVIL AVIATION REGULATIONS 1988 - REG 256
Intoxicated persons not to act as pilots etc or be carried on aircraft
(1) A person shall not, while in a state of intoxication, enter any aircraft.
Penalty: 5 penalty units.
(2) A person acting as a member of the operating crew of an aircraft, or carried in the aircraft to act as a member of the operating crew, shall not, while so acting or carried, be in a state in which, by reason of his or her having consumed, used, or absorbed any alcoholic liquor, drug, pharmaceutical or medicinal preparation or other substance, his or her capacity so to act is impaired.
Penalty: 50 penalty units.
(3) A person shall not act as, or perform any duties or functions preparatory to acting as, a member of the operating crew of an aircraft if the person has, during the period of 8 hours immediately preceding the departure of the aircraft consumed any alcoholic liquor.