Major conversion means a conversion of a vessel that, as determined by the Commandant -
(1) Substantially changes the dimensions or carrying capacity of the vessel;
(2) Changes the type of vessel;
(3) Substantially prolongs the life of the vessel; or
(4) Otherwise so changes the vessel that it is essentially a new vessel.
46 CFR § 125.160
Each term defined elsewhere in this chapter for a particular class of vessel applies to this subchapter unless a different definition is given in this section. As used by this subchapter -