The authority may provide for the making of a covenant which limits, restricts, or prohibits the power of the authority to mortgage or otherwise encumber, sell, lease, or dispose of any or all facilities and properties, any revenues of which are charged with the payment of any bonds in connection with which the covenant is made, or to enter into any lease or agreement which might impair or impede the operation of such facilities or properties, or any part thereof, or might otherwise impair or impede the rights of bondholders with respect to such revenues.