Sec. 8101.255. TRUST INDENTURE. The trust indenture may contain provisions prescribed by the board that: (1) provide for the security of the bonds and the operation and preservation of the trust estate; (2) provide for amendment or modification of the trust indenture; (3) provide for the issuance of bonds to replace lost or mutilated bonds; and (4) condition the right to spend authority money or sell authority property on the approval of a licensed engineer selected as provided by the trust indenture. Acts 2003, 78th Leg., ch. 1277, Sec. 1, eff. April 1, 2005.