46 CFR § 173.058
Double bottom requirements
April 15, 2021
Each new sailing school vessel which has a mean length greater than 165 feet (50.3 meters) and is certificated for exposed water service must comply with the double bottom requirements in §§171.105 through 171.109, inclusive, of this subchapter.
[CGD 83-005, 51 FR 924, Jan. 9, 1986]