46 C.F.R. § 170.120 Stability letter.
Title 46 - Shipping
(a) Except as provided in paragraph (b) of this section, each vessel must have a stability letter issued by the Coast Guard or the ABS before the vessel is placed into service. This letter sets forth conditions of operation. (b) A stability letter is not required if the information can be placed on the Certificate of Inspection or the Load Line Certificate. [CGD 79–023, 48 FR 51010, Nov. 4, 1983, as amended by CGD 95–028, 62 FR 51217, Sept. 30, 1997]
Title 46: Shipping
PART 170—STABILITY REQUIREMENTS FOR ALL INSPECTED VESSELS
Subpart D—Stability Instructions for Operating Personnel
§ 170.120 Stability letter.

