14 CFR §13.33

1. (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.
2. (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.
3. (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.
   1. (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.