Document ID: chunk:federal_register_of_legislation:F2024L01024:front:0:p183
Version: federal_register_of_legislation:F2024L01024
Segment Type: other
Provision Reference: 
Character Range: 531246–534378

any of the following:
Note 1: The control status of acoustic projectors, including transducers, specially designed for other equipment is determined by the control status of the other equipment not specified by 6A001.
Note 2: 6A001.a.1.c. does not apply to electronic sources which direct the sound vertically only, or mechanical (e.g. air gun or vapour‑shock gun) or chemical (e.g. explosive) sources.
Note 3: Piezoelectric elements specified by 6A001.a.1.c. include those made from lead‑magnesium‑niobate/lead‑titanate (Pb(Mg1/3Nb2/3)O3‑PbTiO3, or PMN‑PT) single crystals grown from solid solution or lead‑indium‑niobate/lead‑magnesium niobate/lead‑titanate (Pb(In1/2Nb1/2)O3‑Pb(Mg1/3Nb2/3)O3–PbTiO3, or PIN‑PMN‑PT) single crystals grown from solid solution.
6. A. 001. a. 1. c. 1. Operating at frequencies below 10 kHz and having any of the following:
                         a. Not designed for continuous operation at 100% duty cycle and having a radiated 'free‑field Source Level (SLRMS)' exceeding (10log(f) + 169.77)dB (reference 1 µPa at 1 m) where f is the frequency in Hertz of maximum Transmitting Voltage Response (TVR) below 10 kHz; or
                         b. Designed for continuous operation at 100% duty cycle and having a continuously radiated 'free‑field Source Level (SLRMS)' at 100% duty cycle exceeding (10log(f) + 159.77)dB (reference 1 µPa at 1 m) where f is the frequency in Hertz of maximum Transmitting Voltage Response (TVR) below 10 kHz; or
                         Technical Note:
                     For the purposes of 6A001.a.1.c.1., the 'free‑field Source Level (SLRMS)' is defined along the maximum response axis and in the far field of the acoustic projector. It can be obtained from the Transmitting Voltage Response using the following equation: SLRMS = (TVR + 20log VRMS) dB (ref 1µPa at 1 m), where SLRMS is the source level, TVR is the Transmitting Voltage Response and VRMS is the Driving Voltage of the Projector.
6. A. 001. a. 1. c. 2. Not used;
                           N.B. See 6A001.a.1.c.1. for items previously specified by 6A001.a.1.c.2.
6. A. 001. a. 1. c. 3. Side‑lobe suppression exceeding 22 dB;
6. A. 001. a. 1. d. Acoustic systems and equipment, designed to determine the position of surface vessels or underwater vehicles and having all the following, and specially designed components therefor:
1. Detection range exceeding 1,000 m; and
2. Determined position error of less than 10 m rms (root mean square) when measured at a range of 1,000 m;
Note: 6A001.a.1.d. includes:
                           a. Equipment using coherent "signal processing" between two or more beacons and the hydrophone unit carried by the surface vessel or underwater vehicle;
                           b. Equipment capable of automatically correcting speed‑of‑sound propagation errors for calculation of a point.
6. A. 001. a. 1. e. Active individual sonars, specially designed or modified to detect, locate and automatically classify swimmers or divers, having all of the following, and specially designed transmitting and receiving acoustic arrays therefor:
1. Detection range exceeding