(a) In lieu of sureties on any bond required under § 591.6(c), an importer may offer United States money, United States bonds (except for savings bonds), United States certificates of indebtedness, Treasury notes, or Treasury bills in an amount equal to the amount of the bond.

(b) At the time the importer deposits any obligation of the United States, other than United States money, with the Administrator, (s)he shall deliver a duly executed power of attorney and agreement, in the form shown in appendix C to this part, authorizing the Administrator or delegate of the Administrator, in case of any default in the performance of any of the conditions of the bond, to sell the obligation so deposited, and to apply the proceeds of sale, in whole or in part, to the satisfaction of any penalties for violations of 49 U.S.C. 30112 and 49 U.S.C. 32506 arising by reasons of default.

(c) If the importer deposits money of the United States with the Administrator, the Administrator, or delegate of the Administrator, may apply the cash, in whole or in part, to the satisfaction of any penalties for violations of 49 U.S.C. 30112 and 49 U.S.C. 32506 arising by reason of default.