5 C.F.R. § 2422.20
What rights do parties have at a hearing?
(a) Rights. A party at a hearing will have the right:
(1) To appear in person or by a representative;
(2) To examine and cross-examine witnesses; and
(3) To introduce into the record relevant evidence.
(b) Documentary evidence and stipulations. Parties must submit two (2) copies of documentary evidence to the Hearing Officer and copies to all other parties. Stipulations of fact between the parties may be introduced into evidence.
(c) Oral argument. Parties will have a reasonable period before the close of the hearing for oral argument. Presentation of a closing oral argument does not preclude a party from filing a brief under paragraph (d) of this section.
(d) Briefs. A party will be given an opportunity to file briefs with the FLRA.
(1) A party must file an initial brief with the FLRA within thirty (30) days from the close of the hearing.
(2) Within ten (10) days from a party's filing of an initial brief, any other party may file with the FLRA a reply brief concerning the initial brief.
(3) A request for an extension of time to file a brief must be in writing and must be received by the FLRA no later than five (5) days before the date the brief is due.