49 CFR §800.40

1. (a)Sections 556 and 557 of title 5, United States Code, do not apply to hearings held under this part. Unless otherwise specified, hearings held under this part are informal, fact-finding proceedings, at which there are no formal pleadings or adverse parties. Any rule issued in a case in which an informal hearing is held is not necessarily based exclusively on the record of the hearing.
2. (b)The NTSB designates a representative to conduct any hearing held under this part. The General Counsel or a designated member of his or her staff may serve as legal officer at the hearing.