Code of Federal Regulations Title 46. Shipping § 46.144.155 Verification of compliance with design standards for a sister vessel

(i) The delivery date of the sister vessel is not more than 2 years after a previous stability test date of either the original vessel or an earlier sister vessel,

The approved lightweight characteristics of that earlier vessel are adopted by the sister vessel;

(ii) Paragraph (a)(6)(i) of this section does not apply, and the lightweight characteristics determined from a deadweight survey of the sister vessel are shown to meet both the following criteria:

The vertical center of gravity (VCG) of the earlier vessel is adopted by the sister vessel and used with the lightweight displacement and LCG determined from the deadweight survey of the sister vessel;

(A) the lightweight displacement differs by not more than 3 percent of the earlier vessel's lightweight displacement, and

(B) the longitudinal center of gravity (LCG) differs by not more than 1 percent of the length between perpendiculars (LBP) of the earlier vessel's LCG,

(iii) Neither paragraph (a)(6)(i) nor (ii) of this section apply because both the criteria in paragraphs (a)(6)(ii)(A) and (B) of this section are not met and lightweight characteristics were determined from a stability test on either the original vessel or a sister vessel,

The vessel must undergo a stability test in accordance with 46 CFR part 170, subpart F;

(iv) No vessel of the class of sister vessels previously underwent a stability test,

One vessel of the class must undergo a stability test in accordance with 46 CFR part 170, subpart F, and each sister vessel to which a stability standard applies must meet either paragraph (a)(6)(ii) or (iii) of this section.