The President may, in writing, authorise a staff member to perform or exercise a function or power of the Tribunal if:
(a) it is a function or power of the Tribunal under:
(i) subsection 21(2) (parties and potential parties to be notified of application); or
(ii) subsection 22(3) (parties to proceeding for review); or
(iii) section 72 (Tribunal must notify parties of Tribunal case event); or
(iv) section 126 (parties to be notified of application); or
(v) section 139 (additional persons to be notified of applications for review); or
(b) the rules prescribe that a staff member may be authorised to perform or exercise the function or power.