Section 45.9 - Seasonal application of load lines for vessels not marked under this part(a) For the purposes of the law and regulations prohibiting submergence of load lines ( 46 U.S.C. 88c ; 46 CFR 42.07-10 ) the marks assigned to vessels holding international load line certificates apply during the following seasons: (1) Vessels assigned freeboards as new vessels under the International Load Line Convention, 1966- (i) Winter-November 1 through March 31.(ii) Summer-April 1 through April 30 and October 1 through October 31.(iii) Tropical-May 1 through September 30;(2) Vessels assigned freeboards as existing vessels under the International Load Line Convention, 1966-(i) Winter-November 1 through March 31;(ii) Summer-April 1 through April 30 and October 1 through October 31;(iii) Tropical-September 16 through September 30;(iv) Tropical Fresh-May 1 through September 15.(b) Except for hopper dredges operating at working freeboards in accordance with subpart C of part 44 of this chapter, the Assigning Authority may not allow for lesser freeboards.CGD 73-49R, 38 FR 12290, May 10, 1973, as amended by CGD 76-080, 54 FR 36977, Sept. 6, 1989