14 C.F.R. § 135.203 VFR: Minimum altitudes.
Title 14 - Aeronautics and Space
Except when necessary for takeoff and landing, no person may operate under VFR— (a) An airplane— (1) During the day, below 500 feet above the surface or less than 500 feet horizontally from any obstacle; or (2) At night, at an altitude less than 1,000 feet above the highest obstacle within a horizontal distance of 5 miles from the course intended to be flown or, in designated mountainous terrain, less than 2,000 feet above the highest obstacle within a horizontal distance of 5 miles from the course intended to be flown; or (b) A helicopter over a congested area at an altitude less than 300 feet above the surface.
Title 14: Aeronautics and Space
PART 135—OPERATING REQUIREMENTS: COMMUTER AND ON DEMAND OPERATIONS AND RULES GOVERNING PERSONS ON BOARD SUCH AIRCRAFT
Subpart D—VFR/IFR Operating Limitations and Weather Requirements
§ 135.203 VFR: Minimum altitudes.
