33 C.F.R. Subpart 67.10—General Requirements for Sound signals
Title 33 - Navigation and Navigable Waters
Source: CGD 72–74R, 37 FR 13512, July 8, 1972, unless otherwise noted.
The sound signal required by §§67.20–10, 67.25–10, and 67.30–10 must: (a) Have its maximum intensity at a frequency between 100 and 1,100 Hertz; (b) Sound a 2-second blast every 20 seconds (2 seconds sound, 18 seconds silence) unless otherwise authorized by the District Commander; (c) Have the rated range required by §67.20–10, §67.25–10, or §67.30–10; (d) Have a height not exceeding 25 feet; (e) Have not more than eight sound sources; (f) Be approved by the Coast Guard under §67.10–15; and (g) Be permanently marked with: (1) The date of Coast Guard approval; (2) The manufacturer and date of manufacture; (3) A model designation; (4) The approved range; and (5) The power necessary to comply with the provisions of paragraph (c) of this section. The sound signal required by §§67.20–10, 67.25–10, and 67.30–10 must: (a) Be located on the structure so that the sound signal produced is audible over 360° in a horizontal plane at all ranges up to and including the required rated range; and (b) Be located at least 10 feet but not more than 150 feet above mean high water. (a) Sound signals required by §§67.20–10, 67.25–10, and 67.30–10 must be operated continuously, regardless of visibility, unless the sound signal is controlled: (1) By an attendant on the structure; (2) Remotely by an attendant on a nearby structure; or (3) By a fog detection device capable of activating the sound signal when the visibility in any direction is reduced to the rated range at which sound signal operation is required by this part. (b) During construction and until such time as a sound signal is installed and operating on a platform, the whistle of an attending vessel moored alongside the platform may be used to sound the signal required for the structure by this part. [CGFR 58–17, 23 FR 3377, May 20, 1958, as amended by USCG–2001–10714, 69 FR 24983, May 5, 2004] (a) The Coast Guard approves a sound signal if: (1) It meets the requirements for sound signals in §67.10–1 (a), (b), (c), (d), and (e) when tested under §67.10–20; or (2) It is similar to a sound signal which was tested and approved under the provisions of this section and the Coast Guard has approved all variations in design, construction, production, and manufacture from the sound signal tested. (b) A sound signal that is an identical production model of a sound signal which has been approved under paragraph (a) of this section is a Coast Guard approved sound signal. (a) Sound signal tests must: (1) Be made by the applicant in the presence of a Coast Guard representative, who certifies the test if the procedures comply with the requirements of this section; (2) Be made with Coast Guard supplied and calibrated sound level meters and power meters; and (3) Be made in an anechoic chamber large enough to accommodate the entire sound signal, as if installed for actual use. (b) The sound pressure level must be measured as a function of: (1) Distance by using a sufficient number of points to allow a far-field extrapolation of the sound pressure level; (2) Power at outputs up to and including the approximate power level necessary to comply with §67.10–1(c); (3) Horizontal angle at increments not greater than 30°; and (4) Harmonic content to at least the third harmonic. (c) In analyzing the test data to determine the minimum power necessary to produce the sound pressure level specified in Table A of this section the Coast Guard follows the procedures prescribed by the International Association of Lighthouse Authorities (IALA) in Supplement No. 3 to the IALA Bulletin of February 1969 for analysis of harmonic components and does not consider components above 1,100 Hertz as adding to the audible range. A person requesting a Coast Guard representative at a test of a sound signal must: (a) Direct a written request to the Office of Aids to Navigation, U.S. Coast Guard Headquarters, 2100 Second Street SW., Washington, DC 20593–0001 including: (1) Requestor's name, address, and telephone number; (2) A description of the sound signal; (3) Rated range for which approval is requested; (4) Location of the anechoic chamber; and (5) Proposed test dates. (b) Bear all the expenses of conducting the test conducted in accordance with §67.10–20 including all travel and per diem expenses of the U.S. Government in sending a Coast Guard representative to the test. [CGD 72–74R, 37 FR 13512, July 8, 1972, as amended by CGD88–052, 53 FR 25119,July 1, 1988; CGD 96–026, 61 FR 33663, June 28, 1996; USCG–2001–10714, 69 FR 24983, May 5, 2004] The Coast Guard may withdraw approval of a sound signal if it fails to meet the requirements of §67.10–1 (a), (b), and (c). (a) The Coast Guard publishes a notice of the approval or withdrawal of approval of a sound signal in the Local Notice to Mariners. (b) A listing of approved sound signals may be obtained from any District Commander. Any sound signal authorized for use by the Coast Guard and manufactured prior to January 1, 1973, is excepted from the requirements in this subpart, except §§67.10–1 (b) and (c), 67.10–5, and 67.10–10, if the sound signal has a minimum sound pressure level as specified in Table A of Subpart 67.10 of Title 33 of the Code of Federal Regulations in effect on December 31, 1972, for the range required by §67.20–10, §67.25–10, or §67.30–10.
Title 33: Navigation and Navigable Waters
PART 67—AIDS TO NAVIGATION ON ARTIFICIAL ISLANDS AND FIXED STRUCTURES
Subpart 67.10—General Requirements for Sound signals
§ 67.10-1 Apparatus requirements.
§ 67.10-5 Location requirements.
§ 67.10-10 Operating requirements.
§ 67.10-15 Approval of sound signals.
§ 67.10-20 Sound signal tests.
§ 67.10-25 Application for tests.
§ 67.10-30 Withdrawal of approval.
§ 67.10-35 Notice of approval and withdrawal of approval.
§ 67.10-40 Sound signals authorized for use prior to January 1, 1973.
