Planned maintenance procedures are important to maintaining the operating condition of equipment. Your vessel is a single screw vessel. How often should you exam your vessel's tail shaft in order to be in compliance with Coast Guard periodic testing and inspection regulations?
• Planned maintenance requirements for critical propulsion components like the tail shaft • Difference between annual inspections and periodic/5‑year cycle inspections in Coast Guard regulations • How requirements may change for single-screw (one propeller) vessels compared with twin-screw vessels
• Ask yourself: Is the tail shaft treated like something that must be opened up every year, or on a longer periodic schedule, similar to drydock requirements? • Consider how often the Coast Guard wants you to physically examine (open up and inspect) a tail shaft versus just visually checking external items. • Think about why a single‑screw vessel (with no backup propulsion) might have a more conservative exam frequency than a multi‑screw vessel.
• Distinguish between visual checks done in water and a full tail shaft examination that generally requires the vessel to be out of the water. • Relate the choices to typical drydock / internal structure inspection cycles (often on a multi‑year basis, not yearly). • Make sure the option you pick clearly matches a periodic (multi‑year) inspection requirement, not routine annual topside checks.
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