(a) No person may operate an airplane under Vspan in uncontrolled airspace when the ceiling is less than 1,000 feet unless flight visibility is at least 2 miles.

(b) No person may operate a helicopter under Vspan in Class G airspace at an altitude of 1,200 feet or less above the surface or within the lateral boundaries of the surface areas of Class B, Class C, Class D, or Class E airspace designated for an airport unless the visibility is at least—

(1) During the day— 1/2 mile; or

(2) At night—1 mile.

[Doc. No. 16097, 43 span 46783, Oct. 10, 1978, as amended by Amdt. 135-41, 56 span 65663, Dec. 17, 1991]