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46 U.S.C. 5104, 5108; Department of Homeland Security Delegation No. 0170.1.
CGD 73-49R, 38 FR 12290, May 10, 1973, unless otherwise noted.
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(a) Where the effective length E of superstructures and trunks that meet the requirements of subpart D of this part is 1.0L, the minimum summer freeboard may be corrected by subtracting 1⁄2Hs.
(b) Where the effective length of superstructures and trunks is less than 1.0L the minimum summer freeboard may be corrected by subtracting a percentage of one-half of the standard superstructure height (Hs) determined by the formula:
Percentage = (E/2L) (1 + E/L) × 100
(c) To be eligible for the correction a trunk must—
(1) Be at least as strong and as stiff as a superstructure;
(2) Have no opening in the freeboard deck in way of the trunk, except small access openings;
(4) Provide a permanent working platform fore and aft with guardrails;
(5) Provide fore and aft access between detached trunks and superstructures by permanent gangways;
(6) Be at least 60 percent of the breadth of the ship in way of the trunk; and
(7) Be at least 0.6 L in length, if no superstructure, is provided.