CFR›Title 46›Chapter I›Part 143 ContainsSubparts A–CCorpusDaily eCFRDisplayed edition2026-09-25Last updated2026-09-25 PART 143—MACHINERY AND ELECTRICAL SYSTEMS AND EQUIPMENT Subparts A Subpart A—General B Subpart B—Requirements for All Towing Vessels C Subpart C—Requirements for New Towing Vessels 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.