27 C.F.R. § 19.193 Changes in construction or use of buildings and equipment.
Title 27 - Alcohol, Tobacco Products and Firearms
(a) Changes. When a material change, affecting the accuracy of the notice of registration, is to be made in the construction or use of buildings or equipment of a plant, other than a change covered by §§19.190, 19.202, 19.203, 19.204, or 19.205, the proprietor shall, before making such change, submit a letterhead notice to the appropriate TTB officer. (b) Letterhead notice. The letterhead notice shall: (1) Describe the proposed change in detail; (2) Be kept on file with the proprietor's current notice of registration; and (3) After completion of the change, be incorporated in the next amendment of the notice of registration on Form 5110.41, unless the appropriate TTB officer requires immediate amendment. (c) Emergency changes. The proprietor may make emergency material changes without prior notification, but when such emergency changes are made, the proprietor shall promptly report such changes to the appropriate TTB officer. (Sec. 201, Pub. L. 85–859, 72 Stat. 1349, as amended, (26 U.S.C. 5172))
Title 27: Alcohol, Tobacco and Firearms
PART 19—DISTILLED SPIRITS PLANTS
Subpart G—Qualification of Distilled Spirits Plants
Changes After Original Qualification
§ 19.193 Changes in construction or use of buildings and equipment.

