Ala. Code § 41-10-143
As security for payment of the principal and interest on bonds issued or obligations assumed by it, an 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, leasing and maintenance of any property and facilities 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 property and facilities 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 article for the protection of the bonds and other obligations being secured and the assurance that revenues from such property and facilities will be sufficient to cover the cost of all direct operation of such property and facilities by the authority and the maintenance in good condition of such property and facilities 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 property and facilities, 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 an authority under this article.
Ala. Code § 41-10-143 (1975)