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:

(a) Forms TTB F 5520.3 and TTB F 5110.41 to cover the proposed alternation of premises;

(b) A special diagram, in duplicate, delineating the premises as they will exist, both during extension and curtailment and clearly depicting all buildings, floors, rooms, areas, equipment and pipe lines (identified individually by letter or number) which are to be subject to alternation, in their relative operating sequence; and

(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.