5 U.S. Code § 6131 - Criteria and review
(a) Notwithstanding the preceding provisions of this subchapter or any collective bargaining agreement and subject to subsection (c) of this section, if the head of an agency finds that a particular flexible or compressed schedule under this subchapter has had or would have an adverse agency impact, the agency shall promptly determine not to—
(b) For purposes of this section, “adverse agency impact” means—
(1) This subsection shall apply in the case of any schedule covering employees in a unit represented by an exclusive representative.
(A) If an agency and an exclusive representative reach an impasse in collective bargaining with respect to an agency determination under subsection (a)(1) not to establish a flexible or compressed schedule, the impasse shall be presented to the Federal Service Impasses Panel (hereinafter in this section referred to as the “Panel”).
(A) If an agency and an exclusive representative have entered into a collective bargaining agreement providing for use of a flexible or compressed schedule under this subchapter and the head of the agency determines under subsection (a)(2) to terminate a flexible or compressed schedule, the agency may reopen the agreement to seek termination of the schedule involved.
(B) If the agency and exclusive representative reach an impasse in collective bargaining with respect to terminating such schedule, the impasse shall be presented to the Panel.
(C) The Panel shall promptly consider any case presented under subparagraph (B), and shall rule on such impasse not later than 60 days after the date the Panel is presented the impasse. The Panel shall take final action in favor of the agency’s determination to terminate a schedule if the finding on which the determination is based is supported by evidence that the schedule has caused an adverse agency impact.
(D) Any such schedule may not be terminated until—
(i) the agreement covering such schedule is renegotiated or expires or terminates pursuant to the terms of that agreement; or