33 C.F.R. § 157.214
The owner, operator, and master of a U.S. tank vessel meeting § 157.10a(b), § 157.10a(c)(2), § 157.10b(a)(2), or § 157.10c(c)(2) shall ensure that the vessel does not engage in a voyage unless the vessel has on board—
(c) Any amending letters issued under § 157.218 approving alterations.
(Reporting and Recordkeeping requirements approved by the Office of Management and Budget under control number 1625-0036)
[CGD 77-058b, 45 FR 43714, June 30, 1980, as amended by CGD 82-28, 50 FR 11629, 11630, Mar. 22, 1985; USCG-2006-25150, 71 FR 39211, July 12, 2006]