In addition to inspections required by section 3307 of this title, the Secretary shall examine or have examined—

(1) each vessel subject to inspection at proper times to ensure compliance with law and regulations; and

(2) crewmember accommodations on each vessel subject to inspection at least once a month or when the vessel enters United States ports to ensure that the accommodations are—

(A) of the size required by law and regulations;

(B) properly ventilated and in a clean and sanitary condition; and

(C) equipped with proper plumbing and mechanical appliances required by law and regulations, and the appliances are in good working condition.