21.—(1) Whenever it appears to the Commissioner that the Director is, through absence, ill-health or other sufficient cause, temporarily unable to act, the Commissioner may appoint a member of the Garda Síochána not below the rank of inspector to act as the Director for such period (not exceeding the duration of the incapacity) as the Commissioner thinks proper, and references to the Director in this Part shall include the member so acting.

(2) The Director may, in writing, delegate any of the functions assigned to the Director under this Part to a member of the Garda Síochána not below the rank of inspector and may revoke any such delegation, and references to the Director in this Part shall include any member to whom any such functions are for the time being so delegated.