49 CFR § 1503.609 - Complaint.
(a) Filing. The agency attorney must file the complaint with the Enforcement Docket Clerk in accordance with § 1503.429, or may file a written motion pursuant to § 1503.629(f)(2)(i) instead of filing a complaint, not later than 30 days after receipt by the agency attorney of a request for hearing. The agency attorney should suggest a location for the hearing when filing the complaint.
(b) Contents. A complaint must set forth the facts alleged, any statute, regulation, or order allegedly violated by the respondent, and the proposed civil penalty in sufficient detail to provide notice of any factual or legal allegation and proposed civil penalty.