---
kind: "range"
citation: "46 C.F.R. §§ 173.054–173.063"
title: "46"
from: "173.054"
to: "173.063"
count: 10
url: "https://uscodex.org/cfr/46/173.054..173.063"
---

# §173.054. Watertight subdivision and damage stability standards for new sailing school vessels.

- (a) Each new sailing school vessel which has a mean length greater than 75 feet (22.8 meters) or which carries more than 30 persons must comply with—
  - (1) [Section 179.210(a)](/cfr/46/179.210.md?p=a) of this chapter;
  - (2) [Sections 171.070 through 171.073](/cfr/46/171.070..171.073.md); and
  - (3) [Section 171.080](/cfr/46/171.080.md) for Type II subdivision and damage stability.
- (b) Each new sailing school vessel which has a mean length of 75 feet (22.8 meters) or less and carries more than 30 persons must comply with either—
  - (1) [Section 179.210(a)](/cfr/46/179.210.md?p=a) of this chapter and [§ 179.220](/cfr/46/179.220.md) of this chapter; or
  - (2) [Section 171.040(a)(1)](/cfr/46/171.040.md?p=a-1), [§§ 171.070 through 171.073](/cfr/46/171.070..171.073.md), and [§ 171.080](/cfr/46/171.080.md).
- (c) Each new sailing school vessel which does not carry more than 30 persons must have a collision bulkhead unless it has a mean length less than 40 feet (12.2 meters) and is certificated for protected or partially protected waters service only.

# §173.055. Watertight subdivision and damage stability standards for existing sailing school vessels.

- (a) Except as provided in [paragraph (c)](#c) of this section, an existing sailing school vessel which carries more than 49 persons must be fitted with a collision bulkhead and any additional bulkheads necessary to provide one compartment subdivision.
- (b) Except as provided in [paragraph (c)](#c) of this section, an existing sailing school vessel which has a mean length greater than 65 feet (19.8 meters), must be fitted with additional transverse watertight bulkheads necessary to provide one compartment subdivision, when the following Subdivision Numerals are exceeded:
  - (1) **For vessels to be operated on Exposed Waters—**
  - (2) **For vessels to be operated on Partially Protected Waters—**
  - (3) **For vessels to be operated on Protected Waters—**
- (c) An existing sailing school vessel which is required to meet a one compartment subdivision standard and has a mean length of 90 feet (27.4 meters) or less may, instead of one compartment subdivision, be fitted with a collision bulkhead and sufficient air tankage or other internal buoyancy to maintain the fully-loaded vessel afloat with positive stability in the flooded condition.
- (d) Except as provided in [paragraph (e)](#e) of this section, an existing sailing school vessel which has a mean length greater than 65 feet (19.8 meters) must be fitted with a collision bulkhead.
- (e) On an existing sailing school vessel, operating on protected waters, which has a mean length of 90 feet (27.4 meters) or less with no other requirement for subdivision, the collision bulkhead may be omitted.
- (f) An existing sailing school vessel, operating on exposed waters, which has a mean length of 65 feet (19.8 meters) or less and is carrying more than 15 persons, must be fitted with a collision bulkhead.

# §173.056. Collision and other watertight bulkheads.

- (a) Collision bulkheads required by this section must comply with the requirements in [§ 171.085](/cfr/46/171.085.md) of this subchapter.
- (b) Each sailing school vessel required to meet [paragraph (a)](/cfr/46/173.054.md?p=a) of § 173.054 must comply with the machinery space bulkhead requirements in [§ 171.095](/cfr/46/171.095.md) of this subchapter.

# §173.057. Permitted locations for Class I watertight doors.

- (a) Class I doors are permitted in any location on a sailing school vessel which has a mean length of 125 feet (38.1 meters) or less.
- (b) Class I doors fitted in accordance with [§ 170.270](/cfr/46/170.270.md) of this subchapter shall additionally be marked in two-inch letters “RECLOSE AFTER USE”, and be provided with a remote position indicator at the main navigating station of the vessel.

# §173.058. Double bottom requirements.


Each new sailing school vessel which has a mean length greater than 165 feet (50.3 meters) and is certificated for exposed water service must comply with the double bottom requirements in [§§ 171.105 through 171.109](/cfr/46/171.105..171.109.md), inclusive, of this subchapter.


# §173.059. Penetrations and openings in watertight bulkheads.


Penetrations and openings in watertight bulkheads must comply with the requirements in [subpart E of part 171](/cfr/46/part171-subpartE.md) of this subchapter or §§ [179.320](/cfr/46/179.320.md), [179.330](/cfr/46/179.330.md), and [179.340](/cfr/46/179.340.md) in subchapter T of this chapter.


# §173.060. Openings in the side of a vessel below the bulkhead or weather deck.

- (a) Openings in the side of a vessel below the bulkhead or weather deck must comply with the requirements in [subpart F of part 171](/cfr/46/part171-subpartF.md) of this subchapter or [§ 179.350](/cfr/46/179.350.md) in subchapter T of this chapter.
- (b) In addition to the requirements in [paragraph (a)](#a) of this section, each sailing school vessel which has a mean length greater than 90 feet must comply with the requirements in [§ 56.50-95](/cfr/46/56.50-95.md) of Subchapter F of this chapter.

# §173.061. Watertight integrity above the margin line.


The watertight integrity of each sailing school vessel above the margin line must comply with the requirements in [subpart G of part 171](/cfr/46/part171-subpartG.md) of this subchapter or [§ 179.360](/cfr/46/179.360.md) in subchapter T of this chapter.


# §173.062. Drainage of weather deck.


The weather deck of each sailing school vessel must be provided with drainage in accordance with the requirements in [subpart H of part 171](/cfr/46/part171-subpartH.md) of this subchapter or [subpart D of part 178](/cfr/46/part178-subpartD.md) in subchapter T of this chapter.


# §173.063. Intact stability requirements.

- (a) Except as provided in this section, each sailing school vessel must meet the intact stability requirements in §§ [170.170](/cfr/46/170.170.md), [171.050](/cfr/46/171.050.md), and [171.055](/cfr/46/171.055.md) of this chapter.
- (b) In applying the requirements in §§ [170.170](/cfr/46/170.170.md) and [171.050](/cfr/46/171.050.md) of this subchapter, the value of “T” is equal to the angle of heel at which the deck edge is immersed or 1/3 of the downflooding angle, whichever is less.
- (c) In applying the requirements of [§ 171.055(d)](/cfr/46/171.055.md?p=d) (1) and (2) of this subchapter—
  - (1) The value “X” is equal to 0.6 long tons/square foot (9.8 metric tons/square meter).
  - (2) For a vessel in service on protected or partially protected waters, values “Y” and “Z” are determined from graphs 173.063 (a) and (b) and multiplied by the multiplier in graph 173.063(e).
  - (3) For a vessel in service on exposed waters, “Y” and “Z” are determined from graphs 173.063 (c) and (d) and multiplied by the multiplier from graph 173.063(e).
  - (4) To convert required numerals to units of “metric tons/square meter,” multiply by 10.94.
- (d) Each vessel of the open boat type that is required to comply with the requirements in §§ [178.300](/cfr/46/178.300.md) and [178.310](/cfr/46/178.310.md) of this chapter, may instead comply with the requirements in [paragraph (e)](#e) of this section.
- (e) In lieu of complying with the requirements of [paragraph (b)](#b) of this section, an open boat may be provided with sufficient air tankage or other internal buoyancy to maintain the vessel afloat when the vessel is completely flooded or capsized. If foam is used to comply with this paragraph, it must be installed in accordance with the requirements in [§ 170.245](/cfr/46/170.245.md) of this subchapter.
- (f) A sailing school catamaran must meet the intact stability requirements in [§ 171.057](/cfr/46/171.057.md).