🔍 Key Concepts

• 46 CFR inspection intervals for passenger vessels and cargo vessels dry-dock exams • Difference between dry-docking and underwater survey in lieu of dry-docking (UWILD) • How to calculate a due date when the rule says "at least twice in 5 years" or "every 2 or 3 years"

💭 Think About

• First decide what basic dry-docking interval applies if the vessel is NOT in an underwater survey program—how many years between dockings? • From the last dry-dock date in May 2011, count forward the correct interval and then consider whether the month or the exact day controls for the due date. • Check whether there is any mid-period requirement (for example, 2.5 years) that might make some choices too early or too late.

✅ Before You Answer

• Verify in 46 CFR what the maximum interval in years is between dry-dock exams for the type of vessel described in the question bank you are using. • Make sure you are adding the interval to the last dry-dock date (May 2011), not to the date you joined the vessel (28 April 2013). • Confirm whether the rule talks about calendar months/years (e.g., "not to exceed X years") rather than a specific day in the month, which may help you choose between options that are in the same general time frame.