27 C.F.R. § 18.39
A proprietor of a volatile fruit-flavor concentrate plant operating a contiguous distilled spirits plant may alternate the use of such premises between the two functions through extension and curtailment by filing with the appropriate TTB officer the following information:
(c) A bond (TTB F 5110.56) or a consent of surety (TTB F 5000.18) to cover the proposed alternation of premises if the proprietor is required to hold a bond under § 19.151 of this chapter to cover the distilled spirits plant premises subject to alternation.
(Approved by the Office of Management and Budget under control numbers 1513-0006, 1513-0013, 1513-0048, and 1513-0125)
[T.D. ATF-455, 66 FR 29482, May 31, 2001, as amended by T.D. TTB-146, 82 FR 1119, Jan. 4, 2017; T.D. TTB-196, 89 FR 87939, Nov. 6, 2024]