CFR›Title 46›Chapter I›Part 143 ContainsSubparts A–CCorpusDaily eCFRDisplayed edition2026-04-24Last updated2026-04-24 PART 143—MACHINERY AND ELECTRICAL SYSTEMS AND EQUIPMENT Subparts A Subpart A—General Sections 143.100–143.115 B Subpart B—Requirements for All Towing Vessels Sections 143.200–143.460 C Subpart C—Requirements for New Towing Vessels Sections 143.500–143.605 Authority46 U.S.C. 3103, 3301, 3306, 3308, 3316, 8104, 8904; 33 CFR 1.05; DHS Delegation No. 0170.1.SourceUSCG-2006-24412, 81 FR 40101, June 20, 2016, unless otherwise noted. Previous 142 Part 142—Fire Protection Next 144 Part 144—Construction and Arrangement