(a) Except as provided by Subsection (b), through charging sufficient rates for services provided by a hospital and through its other revenue sources, the board shall produce revenue sufficient to:
(1) pay the expenses of owning, operating, and maintaining the hospital;
(2) pay the interest on the bonds as it becomes due;
(3) create a sinking fund to pay the bonds as they become due; and
(4) create and maintain a bond reserve fund and other funds as provided in the bond resolution or trust indenture.
(b) If the hospital is used, operated, or acquired by a nonprofit corporation under Chapter 223 or is leased, the board shall require the nonprofit corporation or the lessee to charge rates for services provided by the hospital that are sufficient, with the nonprofit corporation's or lessee's other sources of revenue, to:
(1) pay the expenses of operating and maintaining the hospital; and
(2) make payments or pay rentals to the authority that are sufficient, with the authority's other pledged sources of estimated revenue, to:
(A) pay the interest on the bonds as it becomes due;
(B) create a sinking fund to pay the bonds as they become due; and
(C) create and maintain a bond reserve fund and other funds as provided in the bond resolution or trust indenture.