---
kind: "section"
citation: "46 C.F.R. § 45.61"
title: "46"
number: "45.61"
heading: "Correction for superstructures and trunks."
url: "https://uscodex.org/cfr/46/45.61"
---

# §45.61. Correction for superstructures and trunks.

- (a) Where the effective length E of superstructures and trunks that meet the requirements of [subpart D](/cfr/46/subpartD.md) 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:
- (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;
  - (3) Have hatchway coamings and covers that meet [§§ 45.143 through 45.147](/cfr/46/45.143..45.147.md);
  - (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.

## Notes

### Authority

Authority: 46 U.S.C. 5104, 5108; Department of Homeland Security Delegation No. 0170.1.

### Source

Source: CGD 73-49R, 38 FR 12290, May 10, 1973, unless otherwise noted.