The President may, in writing, authorise the Principal Registrar to perform or exercise a function or power of the Tribunal if:
(a) the President could authorise:
(i) a registrar to perform or exercise the function or power of the Tribunal (see section 285); or
(ii) a staff member to perform or exercise the function or power of the Tribunal (see section 286); or
(b) the rules prescribe that the Principal Registrar may be authorised to perform the function or exercise the power.