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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Federal Mediation and Conciliation Service (FMCS)

When an agency and union have negotiated over a particular subject and have reached an impasse, the Federal Service Labor-Management Relations Statute provides a mechanism to resolve their impasse.  But first, the parties must seek mediation assistance from a third party, such as the Federal Mediation and Conciliation Service (FMCS-Agency), in an attempt to informally resolve the matter.  If mediaiton is unsuccesful, then the parties may jointly or sperately request the assistance of the Federal Service Impasses Panel (Panel).