(Model Law art 15)
Where the mandate of an arbitrator terminates under
section 13 or section 14 or because of the arbitrator's withdrawal from
office for any other reason or because of the revocation of the arbitrator's
mandate by agreement of the parties or in any other case of termination of the
arbitrator's mandate, a substitute arbitrator must be appointed according to
the rules that were applicable to the appointment of the arbitrator being
replaced.