17.21—Painting and lighting, when required.
Antenna structures shall be painted and lighted when:
(a)
They exceed 60.96 meters (200 feet) in height above the ground or they require special aeronautical study.
(b)
The Commission may modify the above requirement for painting and/or lighting of antenna structures, when it is shown by the applicant that the absence of such marking would not impair the safety of air navigation, or that a lesser marking requirement would insure the safety thereof.
[32 FR 11269, Aug. 3, 1967, as amended at 42 FR 54824, Oct. 11, 1977]