47 CFR 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]
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§ 17.51 [Reserved]