---
kind: "section"
citation: "46 C.F.R. § 170.255"
title: "46"
number: "170.255"
heading: "Class 1 doors; permissible locations."
url: "https://uscodex.org/cfr/46/170.255"
---

# §170.255. Class 1 doors; permissible locations.

- (a) Except as provided in paragraphs [(b)](#b) and [(c)](#c) of this section, Class 1 doors within passenger, crew, and working spaces are permitted only above a deck, the molded line of which, at its lowest point at side, is at least 7 feet (2.14 meters) above the deepest load line.
- (b) **Class 1 doors are permitted within passenger, crew, and working spaces, wherever located, if—**
  - (1) In the judgment of the OCMI, the door is in a location where it will be closed at all times except when actually in use; and
  - (2) The vessel is less than 150 gross tons and will not proceed more than 20 nautical miles (37 kilometers) from shore; or
  - (3) **The vessel is in rivers or lakes, bays, and sounds service.**
- (c) **Class 1 doors are permitted in any location on a vessel that—**
  - (1) Is less than 100 gross tons; and
  - (2) **Will operate only in the offshore oil industry trade.**
- (d) Quick-acting Class 1 doors are permitted in any location on a vessel that operates on the Great Lakes and is required to meet the damage stability standards of [subpart H of part 172](/cfr/46/part172-subpartH.md) of this chapter.
- (e) For vessels required to meet the damage stability standards of [subpart H](/cfr/46/subpartH.md) of this chapter, when Class 1 doors are installed below a deck the molded line of which at its lowest point at side is less than 7 feet (2.14 meters) above the deepest load line, an indicator light for each door which warns when the door is open must be installed on the bridge.

## Notes

### Amendments

[CGD 79-023, 48 FR 51010, Nov. 4, 1983, as amended by CGD 80-159, 51 FR 33059, Sept. 18, 1986]

### Authority

Authority: 43 U.S.C. 1333; 46 U.S.C. 2103, 3306, 3703; E.O. 12234, 45 FR 58801, 3 CFR, 1980 Comp., p. 277; Department of Homeland Security Delegation No. 0170.1.

### Source

Source: CGD 79-023, 48 FR 51010, Nov. 4, 1983, unless otherwise noted.

### Amendments

[CGD 79-023, 48 FR 51010, Nov. 4, 1983, as amended by CGD 80-159, 51 FR 33059, Sept. 18, 1986]