14 C.F.R. § 16.103 Notice of investigation.
Title 14 - Aeronautics and Space
Following the initiation of an investigation under §16.101, the FAA sends a notice to the person(s) subject to investigation. The notice will set forth the areas of the agency's concern and the reasons therefor; request a response to the notice within 30 days of the date of service; and inform the respondent that the FAA will, in its discretion, invite good faith efforts to resolve the matter.
Title 14: Aeronautics and Space
PART 16—RULES OF PRACTICE FOR FEDERALLY-ASSISTED AIRPORT ENFORCEMENT PROCEEDINGS
Subpart D—Special Rules Applicable to Proceedings Initiated by the FAA
§ 16.103 Notice of investigation.