---
kind: "unit"
title: "46"
title_heading: "Shipping"
key: "chI/subchM/part139"
level: "part"
label: "Part 139"
heading: "Third-Party Organizations"
release: "ecfr-current"
date: "2026-08-27"
url: "https://uscodex.org/cfr/46/chI-subchM-part139"
sections_count: 13
---

# Part 139 — Third-Party Organizations

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

## Sections

- [§139.100. Purpose.](/cfr/46/139.100.md)
- [§139.110. Organizations not subject to further approval.](/cfr/46/139.110.md)
- [§139.115. General.](/cfr/46/139.115.md)
- [§139.120. Application for approval as a TPO.](/cfr/46/139.120.md)
- [§139.125. Approval of TPO.](/cfr/46/139.125.md)
- [§139.130. Qualifications of auditors and surveyors.](/cfr/46/139.130.md)
- [§139.135. Addition and removal of auditors and surveyors.](/cfr/46/139.135.md)
- [§139.140. Renewal of TPO approval.](/cfr/46/139.140.md)
- [§139.145. Suspension of approval.](/cfr/46/139.145.md)
- [§139.150. Revocation of approval.](/cfr/46/139.150.md)
- [§139.155. Appeals of suspension or revocation of approval.](/cfr/46/139.155.md)
- [§139.160. Coast Guard oversight activities.](/cfr/46/139.160.md)
- [§139.165. Documentation.](/cfr/46/139.165.md)