Cases from cite.case.law:

SAWYER, H. v. UNITED STATES, 297 F. Supp. 324 (E.D.N.Y. 1969)

. . . to inform the Flight Controller that its no. 2 VOR system was inoperative was a clear violation of § 40.361 . . . of the Civil Air Regulations of the Civil Aeronautics Board, which provides: § 40.361 Reporting potentially . . . ground facilities to the New York Center or the Ground Controller, as required by FAA regulations, •§ 40.361 . . .

J. CONNOR v. B. JOHNSON, 256 F. Supp. 962 (S.D. Miss. 1966)

. . . Representatives can conceivably be elected by counties having a combined total population of 879,123 or 40.361% . . .