14 C.F.R. § 13.33 – Parties, representatives, and notice of appearance.

(a) Parties. Parties to proceedings under this subpart include the following: Complainant, respondent, and where applicable, intervenor.
1. (1) Complainant is the FAA Office that issued the notice of proposed action under the authorities listed in § 13.31.
2. (2) Respondent is the party filing a request for hearing.
3. (3) Intervenor is a person permitted to participate as a party under § 13.51.
(b) Representatives. Any party to a proceeding under this subpart may appear and be heard in person or by a representative. A representative is an attorney, or another representative designated by the party.
(c) Notice of appearance—(1) Content. The representative of a party must file a notice of appearance that includes the representative's name, address, telephone number, and, if available, fax number, and email address.
(2) Filing. A notice of appearance may be incorporated into an initial filing in a proceeding. A notice of appearance by additional representatives or substitutes after an initial filing in a proceeding must be filed independently.