Article 10

If an arbitrator withdraws after a challenge, or the administrator sustains the challenge, or the administrator determines that there are sufficient reasons to accept the resignation of an arbitrator, or an arbitrator dies, a substitute arbitrator shall be appointed pursuant to the provisions of Article 6, unless the parties otherwise agree.

Article 11

1.       If an arbitrator on a three-person tribunal fails to participate in the arbitration for reasons other than those identified in Article 10, the two other arbitrators shall have the power in their sole discretion to continue the arbitration and to make any decision, ruling or award, notwithstanding the failure of the third arbitrator to participate. In determining whether to continue the arbitration or to render any decision, ruling or award without the participation of an arbitrator, the two other arbitrators shall take into account the stage of the arbitration, the reason, if any, expressed by the third arbitrator for such nonparticipation, and such other matters as they consider appropriate in the circumstances of the case. In the event that the two other arbitrators determine not to continue the arbitration without the participation of the third arbitrator, the administrator on proof satisfactory to it shall declare the office vacant, and a substitute arbitrator shall be appointed pursuant to the provisions of Article 6, unless the parties otherwise agree.