67.10-20—Sound signal tests.
(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;
(3)
Be made in an anechoic chamber large enough to accommodate the entire sound signal, as if installed for actual use.
(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) ;
(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.