Article 56U.K.
(1) After a Commission or a Tribunal has been constituted and proceedings have begun, its composition shall remain unchanged; provided, however, that if a conciliator or an arbitrator should die, become incapacitated, or resign, the resulting vacancy shall be filled in accordance with the provisions of Section 2 of Chapter III or Section 2 of Chapter IV.
(2) A member of the Commission or Tribunal shall continue to serve in that capacity notwithstanding that he shall have ceased to be a member of the Panel.
(3) If a conciliator or arbitrator appointed by a party shall have resigned without the consent of the Commission or Tribunal of which he was a member, the Chairman shall appoint a person from the appropriate Panel to fill the resulting vacancy.