---
kind: "unit"
title: "46"
title_heading: "Shipping"
key: "chI/subchM/part143"
level: "part"
label: "Part 143"
heading: "Machinery and Electrical Systems and Equipment"
release: "ecfr-current"
date: "2026-08-27"
url: "https://uscodex.org/cfr/46/chI-subchM-part143"
sections_count: 43
---

# Part 143 — Machinery and Electrical Systems and Equipment

Title 46 C.F.R. — Shipping › Chapter I — Coast Guard, Department of Homeland Security › Subchapter M — Towing Vessels

## Contents

- [Subpart A — General](/cfr/46/chI-subchM-part143-subpartA.md)
- [Subpart B — Requirements for All Towing Vessels](/cfr/46/chI-subchM-part143-subpartB.md)
- [Subpart C — Requirements for New Towing Vessels](/cfr/46/chI-subchM-part143-subpartC.md)