--- kind: "range" citation: "47 C.F.R. §§ 17.47–17.56" title: "47" from: "17.47" to: "17.56" count: 8 url: "https://uscodex.org/cfr/47/17.47..17.56" --- # §17.47. Inspection of antenna structure lights and associated control equipment. The owner of any antenna structure which is registered with the Commission and has been assigned lighting specifications referenced in this part: - (a) - (1) Shall make an observation of the antenna structure's lights at least once each 24 hours either visually or by observing an automatic properly maintained indicator designed to register any failure of such lights, to insure that all such lights are functioning properly as required; or alternatively, - (2) Shall provide and properly maintain an automatic alarm system designed to detect any failure of such lights and to provide indication of such failure to the owner. - (b) Shall inspect at intervals not to exceed 3 months all automatic or mechanical control devices, indicators, and alarm systems associated with the antenna structure lighting to insure that such apparatus is functioning properly. - (c) Is exempt from [paragraph (b)](#b) of this section for any antenna structure monitored by a system that the Wireless Telecommunications Bureau has determined includes self-diagnostic features sufficient to render quarterly inspections unnecessary, upon certification of use of such system to the Bureau. # §17.48. Notification of extinguishment or improper functioning of lights. The owner of any antenna structure which is registered with the Commission and has been assigned lighting specifications referenced in this part: - (a) Shall report immediately to the FAA, by means acceptable to the FAA, any observed or otherwise known extinguishment or improper functioning of any top steady burning light or any flashing obstruction light, regardless of its position on the antenna structure, not corrected within 30 minutes. If the lights cannot be repaired within the FAA's Notices to Airmen (NOTAM) period, the owner shall notify the FAA to extend the outage date and report a return-to-service date. The owner shall repeat this process until the lights are repaired. Such reports shall set forth the condition of the light or lights, the circumstances which caused the failure, the probable date for restoration of service, the FCC Antenna Structure Registration Number, the height of the structure (AGL and AMSL if known) and the name, title, address, and telephone number of the person making the report. Further notification to the FAA by means acceptable to the FAA shall be given immediately upon resumption of normal operation of the light or lights. - (b) An extinguishment or improper functioning of a steady burning side intermediate light or lights, shall be corrected as soon as practicable, but notification to the FAA of such extinguishment or improper functioning is not required. # §17.49. Recording of antenna structure light inspections in the owner record. The owner of each antenna structure which is registered with the Commission and has been assigned lighting specifications referenced in this part must maintain a record of any observed or otherwise known extinguishment or improper functioning of a structure light. This record shall be retained for a period of two years and provided to the FCC or its agents upon request. The record shall include the following information for each such event: - (a) **The nature of such extinguishment or improper functioning.** - (b) **The date and time the extinguishment or improper operation was observed or otherwise noted.** - (c) **Date and time of FAA notification, if applicable.** - (d) **The date, time and nature of adjustments, repairs, or replacements made.** # §17.50. Cleaning and repainting. Antenna structures requiring painting under this part shall be cleaned or repainted as often as necessary to maintain good visibility. Evaluation of the current paint status shall be made by using the FAA's In-Service Aviation Orange Tolerance Chart. This chart is based upon the color requirements contained in the National Bureau of Standards Report NBSIR 75-663, Color Requirements for the Marking of Obstructions. # §17.51. Reserved # §17.53. Lighting equipment and paint. The lighting equipment, color or filters, and shade of paint referred to in the specifications are further defined in the following government and/or Army-Navy aeronautical specifications, bulletins, and drawings (lamps are referred to by standard numbers): # §17.54. Rated lamp voltage. To insure the necessary lumen output by obstruction lights, the rated voltage of incandescent lamps used shall correspond to be within 3 percent higher than the voltage across the lamp socket during the normal hours of operation. # §17.56. Maintenance of lighting equipment. Replacing or repairing of lights, automatic indicators or automatic control or alarm systems shall be accomplished as soon as practicable.