Question 411General Subjects - 1st Asst/Chief

The correct answer is D) At least twice within any 5 year period. The reasoning behind this is that the Coast Guard regulations require the tail shaft of a single screw vessel to be examined at least twice within any 5 year period. This is outlined in 46 CFR 61.10-5, which states that the tail shaft must be examined at intervals not exceeding 3 years. Therefore, to be in compliance, the vessel must undergo tail shaft examination at least twice (minimum) within any 5 year period. The other options are incorrect because A) is less frequent than the required minimum of twice in 5 years, B) is only once in 5 years which does not meet the twice in 5 years requirement, and C) is too frequent as the regulations do not mandate annual tail shaft examinations for this type of vessel.