850.5—Definitions.
As used in this part:
(a)
Act means Title III of Pub. L. 93-633, the Independent Safety Board Act of 1974 (49 U.S.C. 1901, et seq. ).
(e)
Major marine casualty means a casualty involving a vessel, other than a public vessel, that results in—
(4)
Serious threat, as determined by the Commandant and concurred in by the Chairman, to life, property, or the environment by hazardous materials.
(f)
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.