S.C. Code Ann. § 55-11-650
(A) For the purpose of this article, the authority may:
(B) The district may issue negotiable bonds, notes, and other evidences of indebtedness payable solely from the gross revenues or net revenues derived from the operation of any revenue-producing facility, or facilities, in its charge. The sums borrowed may be those needed to pay the costs of any extension, addition, or improvement to its airport facility. The proceeds of the bonds may, in addition, be used to refund any bonds issued under the provisions of this article, to pay interest during the estimated construction period of the project being financed, to fund any necessary reserves for the bonds, to purchase any necessary credit enhancement for the bonds, and to pay costs of issuance of the bonds. If the method of financing authorized by this subsection is used, neither the faith and credit of the State of South Carolina, nor of any county lying within the district, nor of the district itself, may be pledged to the payment of the principal and interest of the obligations, and there must be on the face of the obligation a statement, plainly worded, to that effect. Neither the members of the authority nor any person signing the obligations are personally liable on them. In order that a convenient procedure for borrowing money pursuant to this subsection may be prescribed, the authority may use the provisions of Chapter 21, Title 6 and Chapter 17, Title 6. In exercising the powers conferred upon the district by those code provisions, the authority may make all pledges and covenants authorized by the provisions of them and may confer upon the holders of its securities all rights and liens authorized by these code provisions. Specifically, and notwithstanding contrary provisions in those code provisions, the district may:
(12) covenant that an adequate schedule of charges will be established and maintained for the facilities designated by the authority, whose revenues must be pledged to secure any bonds, to the extent necessary to produce sufficient revenues to: