Ala. Code § 9-6-10
As security for payment of the principal and interest on bonds issued or obligations assumed by it, the authority may enter into a contract or contracts binding itself for the proper application of the proceeds of bonds and other funds, for the continued operation and maintenance of any equipment, facilities, apparatus or systems owned or controlled and operated by it or under its authority or any part or parts thereof, for the imposition and collection of reasonable rates and rentals for and the promulgation of reasonable regulations respecting the use of equipment, facilities, apparatus and systems of the authority and any service furnished therefrom, for the disposition and application of its gross revenues or any part thereof and for any other act or series of acts not inconsistent with the provisions of this chapter for the protection of the bonds and other obligations being secured and the assurance that revenues from such equipment, facilities, apparatus and systems will be sufficient to cover the cost of all direct operation of such equipment, facilities, apparatus and systems by the authority and the maintenance in good repair and good operating condition of such equipment, facilities, apparatus and systems owned and controlled by the authority, the payment of the principal of and interest on any bonds payable from such revenues and the maintenance of such reserves as may be deemed appropriate for the protection of the bonds, the efficient operation of such equipment, facilities, apparatus and systems and the making of replacements thereof and capital improvements thereto. Any contract pursuant to the provisions of this section may be set forth in any resolution of the board authorizing the issuance of bonds or the assumption of obligations or in any mortgage and deed of trust and trust indenture made by the authority under this chapter.
Ala. Code § 9-6-10 (1975)