Section 1206.4 - Time limits on applicationsExcept in unusual or extraordinary circumstances, the National Mediation Board will not accept an application for investigation of a representation dispute among employees of a carrier:
(a) For a period of two (2) years from the date of a certification or decertification covering the same craft or class of employees on the same carrier, and(b) For a period of one (1) year from the date on which:(1) The Board dismissed a docketed application after having conducted an election among the same craft or class of employees on the same carrier and less than a majority of valid ballots cast were for representation; or(2) The Board dismissed a docketed application covering the same craft or class of employees on the same carrier because no dispute existed as defined in § 1206.2 of these rules; or(3) The Board dismissed a docketed application after the applicant withdrew an application covering the same craft or class of employees on the same carrier after the application was docketed by the Board.44 FR 10602, Feb. 22, 1979, as amended at 75 FR 26088 , May 11, 2010; 84 FR 35989 , July 26, 2019