Ind. Code § 8-10-1-16
In the discretion of the ports of Indiana any bonds issued under the provisions of this act may be secured by a trust agreement by and between the ports of Indiana and a corporate trustee, which may be any trust company or bank having the powers of a trust company within the state, except as provided in IC 8-10-4. Any resolution adopted by the commission providing for the issuance of revenue bonds and any trust agreement pursuant to which such bonds are issued may pledge or assign all or any portion of the revenues received or to be received by the ports of Indiana except such part as may be necessary to pay the cost of the ports of Indiana's administrative expenses, operation, maintenance and repair and to provide reserves therefor and depreciation reserves required by any bond resolution adopted or trust agreement executed by the ports of Indiana, but the ports of Indiana shall not convey or mortgage any port or project or any part thereof, except for self liquidating or nonrecourse projects under IC 8-10-4. In authorizing the issuance of bonds for any particular port or project, the ports of Indiana may limit the amount of such bonds that may be issued as a first lien and charge against the revenues pledged to the payment of such bonds or the ports of Indiana may authorize the issuance from time to time thereafter of additional bonds secured by the same lien to provide funds for the completion of the port or project on account of which the original bonds were issued, or to provide funds to pay the cost of additional projects undertaken in connection with the development of the port or project, or for both such purposes. Such additional bonds shall be issued on such terms and conditions as may be provided in the bond resolution or resolutions adopted by the commission and in the trust agreement or any agreement supplemental thereto and may be secured equally and ratably without preference, priority, or distinction with the original issue of bonds or may be made junior thereto. Any pledge or assignment made by the ports of Indiana pursuant hereto shall be valid and binding from the time that the pledge or assignment is made and the revenues so pledged and thereafter received by the ports of Indiana shall immediately be subject to the lien of such pledge or assignment without physical delivery thereof or further act. The lien of such pledge or assignment shall be valid and binding against all parties having claims of any kind in tort, contract or otherwise against the ports of Indiana irrespective of whether such parties have notice thereof. Neither the resolution nor any trust agreement by which a pledge is created or assignment made need be filed or recorded except in the records of the ports of Indiana. Any such trust agreement or any resolution providing for the issuance of such bonds may contain such provisions for protecting and enforcing the rights and remedies of the bondholders as may be reasonable and proper and not in violation of law, including, but not limited to, covenants setting forth the duties of the ports of Indiana in relation to the acquisition of property and the construction, improvement, maintenance, repair, operation, and insurance of the port or project in connection with which such bonds shall have been authorized, the rates of fees, tolls, rentals, or other charges, to be collected for the use of the project, and the custody, safeguarding, and application of all moneys, and provisions for the employment of consulting engineers in connection with the construction or operation of such project. It shall be lawful for any bank or trust company incorporated under the laws of the state which may act as depository of the proceeds of bonds or other funds of the ports of Indiana, to furnish such indemnifying bonds or to pledge such securities as may be required by the ports of Indiana. Any such trust agreement may set forth the rights and remedies of the bondholders and of the trustee, and may restrict the individual right of action by bondholders as is customary in trust agreements or trust indentures securing bonds or debentures of private corporations. In addition to the foregoing, any such trust agreement may contain such other provisions as the ports of Indiana may deem reasonable and proper for the security of the bondholders. All expenses incurred in carrying out the provisions of any such trust agreement may be treated as a part of the cost of the operation of the port or project.
IC 8-10-1-16