Tennessee Code Title 4. State Government § 4-31-604

(d)(1) The authority shall establish a repayment schedule to be made by an airport authority or municipal airport under a loan agreement. Such repayments shall be in such amounts as will be at least sufficient, together with other funds available therefor, to pay the principal of, and interest on, bonds and notes issued by the authority for the purpose of providing loans to airport authorities or municipal airports for the financing of projects, and as may be necessary for the authority to maintain a reserve for debt service. The authority may collect an administrative fee in addition to such repayment schedule in an amount as may be set forth in the loan agreement.

(2) The annual repayment schedule for each loan shall be, in cases prior to the funding of such loans or where such loans have been financed on an interim basis other than by bonds, an estimated annual repayment schedule showing debt service requirements under the loan agreement as if the bonds to be issued to fund such loans will bear interest at a rate per annum and mature in such manner as the authority shall establish at the time of the approval of each such loan and, in cases where bonds have been issued to fund such loan, the actual debt service requirements on such bonds.