🔍 Key Concepts

• Class dry-docking survey scope – what classification societies are especially interested in when the hull is out of the water • The purpose of checking sea chests, tail shaft weardown, and rudder assembly • Difference between items that can be fully checked only when the vessel is dry-docked vs. afloat

💭 Think About

• Ask yourself: Which of these components are normally hidden below the waterline and best examined when the ship is out of the water? • Think about why Class wants condition and wear measurements when the vessel is in dry dock rather than during an afloat survey. • Consider whether Class is more likely to look at just one or two pieces of underwater equipment, or at the whole set of critical underwater steering/propulsion/seawater‑intake components.

✅ Before You Answer

• Verify which items are underwater fittings that require dry-dock access to inspect properly. • Confirm that tail shaft weardown readings are typically taken when the propeller and stern gear are exposed in dry dock. • Check whether sea chests and rudder assembly are usually part of a standard Class dry-docking examination.