CFR > Title 47 - Telecommunication > CHAPTER I—FEDERAL COMMUNICATIONS COMMISSION > SUBCHAPTER A—GENERAL (Parts 0–19) > PART 17—CONSTRUCTION, MARKING, AND LIGHTING OF ANTENNA STRUCTURES > SUBPART C—Specifications for Obstruction Marking and Lighting of Antenna Structures (§17.21 to §17.58) > 17.51—Time when lights should be exhibited.

17.51—Time when lights should be exhibited.

(a) All red obstruction lighting shall be exhibited from sunset to sunrise unless otherwise specified.
(b) All high intensity and medium intensity obstruction lighting shall be exhibited continuously unless otherwise specified.
[40 FR 30267, July 18, 1975, as amended at 61 FR 4364, Feb. 6, 1996]