14 CFR 13.103 - Order of investigation.
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.