14 C.F.R. § 13.103 Order of investigation.
Title 14 - Aeronautics and Space
The order of investigation— (a) Defines the scope of the investigation by describing the information sought in terms of its subject matter or its relevancy to specified FAA functions; (b) Sets forth the form of the investigation which may be either by individual deposition or investigative proceeding or both; and (c) Names the official who is authorized to conduct the investigation and serve as the Presiding Officer.
Title 14: Aeronautics and Space
PART 13—INVESTIGATIVE AND ENFORCEMENT PROCEDURES
Subpart F—Formal Fact-Finding Investigation Under an Order of Investigation
§ 13.103 Order of investigation.