As used in this subpart:

(a) Act means title III of Public Law 93-633, the Independent Safety Board Act of 1974, (49 U.S.C. § 1131).

(b) Board means the National Transportation Safety Board.

(c) Chairman means the Chairman of the National Transportation Safety Board.

(d) Major marine casualty means a casualty involving a vessel, other than a public vessel, that results in:

(1) The loss of six or more lives:

(2) The loss of a mechanically propelled vessel of 100 or more gross tons;

(3) Property damage initially estimated at $500,000 or more; or

(4) Serious threat, as determined by the Commandant and concurred in by the Chairman, to life, property, or the environment by hazardous materials.

(e) Public vessel means a vessel owned by the United States, except a vessel to which the Act of October 25, 1919, c.82, (41 Stat. 305, 46 U.S.C. § 363) applies.

(f) Vessel of the United States means a vessel:

(1) Documented or required to be documented under the laws of the United States;

(2) Owned in the United States; or

(3) Owned by a citizen or resident of the United States and not registered under a foreign flag.

[CGD 76-149, 42 FR 61200, Dec. 1, 1977, as amended by CGD 95-028, 62 FR 51195, Sept. 30, 1997; USCG-2021-0348, 87 FR 3223, Jan. 21, 2022; 87 FR 35901, June 14, 2022]