🔍 Key Concepts

• Class and flag-state requirements for securing critical engine fastenings • Typical methods used to prevent nuts and bolts from working loose on moving or vibrating machinery • Wording often used in regulations: specific device vs. any effective means

💭 Think About

• Which option would safely cover all types and sizes of main bearings and connecting rod bolts, from small to very large engines? • Does the regulation usually prescribe one exact hardware type, or does it allow for different securing methods as long as they are effective? • Which choice sounds like a general regulatory requirement rather than a brand‑ or design‑specific solution?

✅ Before You Answer

• Make sure the choice could logically apply to all other moving parts, not just some of them • Look for wording that a surveyor or inspector could apply flexibly to different engine designs (general but still safe) • Avoid answers that sound too narrow, proprietary, or only suited to a particular engine size or speed range