Towing & Ship-Assist · Subchapter M — COI Validity
A towing vessel Certificate of Inspection (COI) issued under Subchapter M is valid for a maximum of:
- A1 year
- B2 years
- C5 years✓ Correct
- D10 years
Explanation
The COI is valid for up to 5 years, subject to required intervening exams/audits. Under the TSMS option these include annual external audits and vessel surveys; the USCG-inspection option requires annual inspections.
Authority: 46 CFR Subchapter M, Part 136
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