(1) At any time, the parties to an arbitration conducted pursuant to these Rules may consent to expedite the arbitration in accordance with this Chapter ( "expedited arbitration" ) by jointly notifying the Secretary-General in writing of their consent.

(2) Chapters I-XII of the ICSID Additional Facility Arbitration Rules apply to an expedited arbitration except that:

(3) If the parties consent to expedited arbitration after the constitution of the Tribunal pursuant to Chapter IV, Rules 80- 82 shall not apply, and the expedited arbitration shall proceed subject to all members of the Tribunal confirming their availability pursuant to

Rule 83(2)

. If an arbitrator is unavailable to proceed on an expedited basis, the arbitrator may offer to resign.