🔍 Key Concepts

• Tailshaft (propeller shaft) survey requirements in classification society or flag-state rules • Which specific operations during a yard period are considered critical enough to need surveyor witnessing • Difference between routine yard work vs class-required, recordable measurements

💭 Think About

• Among these four options, which operation most directly affects long‑term safety of propulsion and is usually documented in class or statutory reports? • Which tasks are commonly done by the shipyard’s own technicians without mandatory third‑party presence, even though they are important? • Think about what a surveyor must be able to independently verify later: would they need to see the actual work being done, or just review the results and reports?

✅ Before You Answer

• Check which step in tailshaft work has formal measurements or tolerances that become part of the class records. • Consider which of these jobs (alignment, bearing assembly, shaft measurements, epoxy casting) is most standardized and repeatable by the yard alone and therefore less likely to require constant surveyor presence. • Ask yourself: in typical class or flag rules, the surveyor is required to witness what, exactly—the taking of measurements, the fitting process, or only certain critical treatments?