The Minister may appoint a person to act as the Presiding Member of the Authority Selection Committee:
(a) during a vacancy in the office of the Presiding Member of the Authority Selection Committee (whether or not an appointment has previously been made to the office); or
(b) during any period, or during all periods, when the Presiding Member of the Authority Selection Committee:
(i) is absent from duty or Australia; or
(ii) is, for any reason, unable to perform the duties of the office.