Document ID: chunk:federal_register_of_legislation:F2024L01024:front:0:p182
Version: federal_register_of_legislation:F2024L01024
Segment Type: other
Provision Reference: 
Character Range: 528512–531502

at an angle exceeding 20° from the vertical;
                           3. Having any of the following:
                            a. Operating frequency below 350 kHz; or
                            b. Designed to measure seabed topography at a range exceeding 200 m from the acoustic sensor; and
                           4. 'Enhancement' of the depth "accuracy" through compensation of all of the following:
                            a. Motion of the acoustic sensor;
                            b. In‑water propagation from sensor to the seabed and back; and
                            c. Sound speed at the sensor.
6. A. 001. a. 1. a. 3. Side Scan Sonar (SSS) or Synthetic Aperture Sonar (SAS), designed for seabed imaging and having all of the following, and specially designed transmitting and receiving acoustic arrays therefor:
a. Designed or modified to operate at depths exceeding 500 m;
b. An 'area coverage rate' of greater than 570 m2/s while operating with an 'along track resolution' of less than 15 cm; and
c. An 'across track resolution' of less than 15 cm.
Technical Notes:
For the purposes of 6A001.a.1.a.3.:
                         1. 'Area coverage rate' (m2/s) is twice the product of the sonar range (m) and the maximum speed (m/s) at which the sensor can operate at that range .
                         2. 'Along track resolution' (cm), for SSS only, is the product of azimuth (horizontal) beamwidth (degrees) and maximum sonar range (m) and 0.873.
                         3. 'Across track resolution' (cm) is 75 divided by the signal bandwidth (kHz).
6. A. 001. a. 1. b. Systems or transmitting and receiving arrays, designed for object detection or location, having any of the following:
1. A transmitting frequency below 10 kHz;
2. Sound pressure level exceeding 224 dB (reference 1 µPa at 1 m) for equipment with an operating frequency in the band from 10 kHz to 24 kHz inclusive;
3. Sound pressure level exceeding 235 dB (reference 1 µPa at 1 m) for equipment with an operating frequency in the band between 24 kHz and 30 kHz;
4. Forming beams of less than 1° on any axis and having an operating frequency of less than 100 kHz;
5. Designed to operate with an unambiguous display range exceeding 5,120 m; or
6. Designed to withstand pressure during normal operation at depths exceeding 1,000 m and having transducers with any of the following:
a. Dynamic compensation for pressure; or
b. Incorporating other than lead zirconate titanate as the transduction element;
6. A. 001. a. 1. c. Acoustic projectors (including transducers), incorporating piezoelectric, magnetostrictive, electrostrictive, electrodynamic or hydraulic elements operating individually or in a designed combination, and having 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