5 C.F.R. § 2422.32
When does the FLRA issue a certification or a revocation of certification?
(a) Certifications. The FLRA issues an appropriate certification when:
(1) After an election, runoff, or rerun:
(i) No party files an objection or challenged ballots are not determinative; or
(ii) The FLRA decides and resolves objections and determinative challenged ballots; or
(2) The FLRA issues a Decision and Order requiring a certification.
(b) Revocations. Without prejudice to any rights and obligations that may exist under the Statute, the FLRA revokes a recognition or certification, as appropriate, and provides a written statement of reasons when:
(1) An incumbent exclusive representative files, during a representation proceeding, a disclaimer of any representational interest in the unit; or
(2) A petition is filed and, due to a substantial change in the character and scope of the unit, the unit is no longer appropriate and an election is not warranted.