Towing & Ship-Assist · Subchapter M — Drydock Exams
Subchapter M requires hull/structural (drydock and internal structural) examinations to be conducted:
- AOnce every 10 years
- BTwice within any 5-year period, with a maximum interval between them✓ Correct
- COnly after a grounding
- DMonthly
Explanation
Towing vessels must undergo two drydock (or underwater survey in lieu) and two internal structural examinations within each 5-year COI period, with limits on the interval between them, to verify hull integrity.
Authority: 46 CFR Subchapter M, Part 137
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