46 C.F.R. § 169.823 Openings.
Title 46 - Shipping
(a) Except as provided in paragraph (b) of this section, all watertight doors in subdivision bulkheads, hatches, and openings in the hull must be kept closed during the navigation of the vessel. (b) The master may permit hatches or other openings to be uncovered or opened for reasonable purposes such as ship's maintenance, when existing conditions warrant the action and the openings can readily be closed.
Title 46: Shipping
PART 169—SAILING SCHOOL VESSELS
Subpart 169.800—Operations
§ 169.823 Openings.
