(a) The water inside the sonar dome must not be discharged for maintenance activities unless the use of a drydock for the maintenance activity is not feasible.

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(b) The water inside the sonar dome may be discharged for equalization of pressure between the interior and exterior of the dome.

(c) A biofouling chemical that is bioaccumulative should not be applied to the exterior of a sonar dome when a non-bioaccumulative alternative is available.

[85 FR 43476, July 17, 2020]