How often are anchor chain and shackles examined and overhauled?

• A. Every 12 Months
• B. Every 24 Months
• C. At Least 18 Months
• D. Every 36 Months

Answer: (C)

Regular maintenance of anchor chain and shackles is essential because these components endure heavy, cyclic loads and constant exposure to saltwater. The schedule tested targets the minimum interval for inspection and overhaul: they must be examined at least every 18 months. Chains can accumulate wear, elongation, and hidden cracks from repeated bending and corrosion, which aren’t always obvious without a careful check. Shackles and their pins can deform or wear at the pin holes or threads, and cotter pins or locking devices must be intact to prevent accidental disengagement. A thorough overhaul means taking the gear out of service, cleaning it, inspecting each link for elongation, cracks, or surface flaws, measuring diameter to ensure it’s within limits, and verifying the shackles and pins for proper fit and security; replace worn parts as needed and re-lubricate. You can schedule more frequent inspections if the rigging sees heavy use or harsh conditions, but the minimum standard is 18 months.