(1) The Administrator may appoint an eligible person for appointment as the Commissioner to act as the Commissioner:
(a) during a vacancy in the office; or
(b) during a period, or all periods, when the Commissioner, or another Acting Commissioner, is unable, or unavailable, to perform official duties.
(2) An appointment to act as the Commissioner during a vacancy in the office may only be for a period or periods not exceeding in aggregate 6 months in any 12 month period.
(3) If the office of Commissioner is vacant for a period of 18 months, no further appointment to act as the Commissioner during the vacancy can be made.
(4) An Acting Commissioner holds office on the conditions, including conditions about remuneration, expenses and allowances, determined by the Administrator.