49 CFR § 845.6 - Designation of parties.
(a) The chairman of the board of inquiry shall designate as parties to the investigative hearing those persons and organizations whose participation in the hearing is deemed necessary in the public interest and whose special knowledge will contribute to the development of pertinent evidence. Parties to the investigative hearing shall be represented by suitable representatives who do not occupy legal positions.
(b) No party to the investigation and/or investigative hearing shall be represented by any person who also represents claimants or insurers. Failure to comply with this provision shall result in loss of status as a party to the investigative hearing.