(a) This subpart applies to a new towing vessel, as defined in §136.110 of this subchapter, unless it is an excepted vessel.

(b) Machinery or electrical systems of a novel design, unusual form, or special material must meet section §143.210.

(c) Unless otherwise noted in §§143.515 and 143.520, new towing vessels must also meet the requirements of subpart B of this part.