When:
(a) the office of Chairperson is vacant; or
(b) the Chairperson is absent from Australia or is, for any reason, unable to attend meetings of the Board or otherwise unable to perform the duties of the office;
the Deputy Chairperson shall act as Chairperson.
Note: For rules that apply to persons acting as the Chairperson, see section 33A of the Acts Interpretation Act 1901 .