14 C.F.R. § 91.305 Flight test areas.
Title 14 - Aeronautics and Space
No person may flight test an aircraft except over open water, or sparsely populated areas, having light air traffic.
Title 14: Aeronautics and Space
PART 91—GENERAL OPERATING AND FLIGHT RULES
Subpart D—Special Flight Operations
§ 91.305 Flight test areas.