🔍 Key Concepts

• 46 CFR requirements for tailshaft examinations on inspected vessels • Difference between drydock inspections, annual inspections, and specific tailshaft interval requirements • How inspection intervals may be expressed (e.g., “once every X years,” “twice every X years”) in 46 CFR

💭 Think About

• Ask yourself: Does 46 CFR tie tailshaft inspections directly to every drydocking, or to a specific time-based interval, or both? • Consider whether yearly inspections would be too frequent for tailshafts compared to typical practice for underwater gear, or if the regulation specifies a longer cycle. • Look at how 46 CFR phrases machinery inspection intervals on twin-screw vessels in contrast to single-screw vessels—does it mention a different frequency or number of exams within a given period?

✅ Before You Answer

• Verify the exact wording in 46 CFR that mentions “twin screw ocean going vessel” and “tailshaft” together. • Check whether the regulation says “once every” or “twice every” a certain number of years—this will help you eliminate two of the options immediately. • Confirm if the rule links the exam to each drydocking or sets a minimum number of inspections within a time period, regardless of how often the vessel docks.