An enclosed superstructure is a superstructure with:
- enclosing bulkheads of efficient construction;
- access openings, if any, in these bulkheads fitted with doors complying with the requirements of regulation 12 .
- all other openings in sides or ends of the superstructure fitted with efficient weathertight means of closing.
A bridge or poop shall not be regarded as enclosed unless access is provided for the crew to reach machinery and other working spaces inside these superstructures by alternative means which are available at all times when bulkhead openings are closed.
The height of a superstructure is the least vertical height measured at side from the top of the superstructure deck beams to the top of the freeboard deck beams.
The length of a superstructure is the mean length of the part of the superstructure which lies within the length (L).
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