In the event the total estimated costs of construction of the project thereafter exceed the total estimated costs initially determined by the Secretary of Agriculture, the Secretary may in addition, upon application therefor, make an insured loan for so much of the additional estimated total costs as does not exceed 10 per centum of the total costs initially estimated.

The Secretary of Agriculture shall make insured loans under this section using, to the extent provided in advance in appropriations Acts, the Agricultural Credit Insurance Fund in section 309 of the Consolidated Farm and Rural Development Act [7 U.S.C. 1929] or the Rural Development Insurance Fund in section 309A of such Act [7 U.S.C. 1929a] (hereinafter in this section referred to as the “Funds”). The Secretary of Agriculture may not use an aggregate amount of funds to make or commit to make insured loans under this section in excess of the aggregate amount for insured loans and administrative costs appropriated and transferred under section 8803 of this title. The terms, conditions, and requirements applicable to such insured loans shall be in accordance with this subchapter.

There shall be reimbursed to the Funds, from appropriations made under section 8803 of this title, amounts equal to the operating and administrative costs incurred by the Secretary of Agriculture in insuring loans under this section.

Notwithstanding any provision of the Consolidated Farm and Rural Development Act [7 U.S.C. 1921 et seq.], no funds made available to the Secretary of Agriculture under this section for insured loans shall be used for any other purpose.

For purposes of this section, the term “insured loan” means a loan which is made, sold, and insured.