At this time FLRA remains fully operational.  Effective Friday March 20, 2020 until April 30, 2020 the agency will no longer receive in-person filings.  

See details: here.

FLRA.gov

U.S. Federal Labor Relations Authority

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Bilateral Arrangements

The agency and the exclusive representative may, together, determine appropriate techniques to assist in resolving negotiation impasses, including the use of interest based bargaining approaches so long as such arrangements result in voluntary settlements without the need for a third party to impose terms on them.

The parties may also agree to resolve their dispute through binding private arbitration; however, that choice must first be approved by the Federal Service Impasses Panel.