🔍 Key Concepts

• 46 CFR requirements for machinery installations, especially for main propulsion lube oil systems • The difference between a vessel’s list (sideways inclination) and trim (fore‑and‑aft inclination) • Typical design angles used in regulations to ensure machinery still works in heavy weather or damaged conditions

💭 Think About

• First, think about which combination of list and trim seems realistic for a vessel that is still expected to operate safely and not be near capsizing conditions. • Consider which angle of list is commonly used in regulations and stability criteria as a design or test condition for machinery operation. • Ask yourself: would a lube oil system reasonably be required to work at the steeper set of angles, or at a more moderate but still severe condition that is likely to be encountered in service?

✅ Before You Answer

• Look up the exact wording in 46 CFR, Subchapter F (Marine Engineering) dealing with lube oil systems for main propulsion machinery. • Confirm the specific list angle stated in the regulation, then match that to the choice that uses the same list and trim values together. • Verify that the angles are described as a permanent list and trim, not temporary or dynamic motion, and make sure the chosen option matches that language.