; and (2) shall be on such terms and conditions and contain such covenants, representations, warranties, and requirements (including requirements for audits) as the Secretary may prescribe. (b) Term of loan The Secretary may provide a covered loan only if the final maturity date of the covered loan is not later than the date on which the electric bus acquired using the covered loan is expected to exceed its useful life, based on the average life expectancy of the electric bus. (c) Buy America Section 5323(j) of title 49, United States Code, shall apply with respect to a project funded using a covered loan in the same manner as to a project funded using amounts appropriated to carry out chapter 53 of such title 49. (d) Non-Federal share for low-No grants The proceeds of a covered loan may be used for any non-Federal share of project costs required under section 5339(c) of title 49, United States Code, if the covered loan is repayable from non-Federal funds. 7. Repayment (a) Commencement Scheduled repayments of principal on a covered loan provided to an eligible entity shall commence not later than 180 days after the date on which the eligible entity places in revenue service the electric bus and necessary infrastructure that were acquired using the covered loan. (b) Prepayment An eligible entity may make repayments on a covered loan in advance of the scheduled repayment date with no penalty. (c) Delinquency Notwithstanding any other provision of law, if an eligible entity fails to make a scheduled repayment on a covered loan, the Secretary may withhold from the eligible entity an equivalent amount of any assistance that would otherwise be provided to the eligible entity under a formula grant program under chapter 53 of title 49, United States Code. 8. Availability of funds Subject to the availability of funds and except as otherwise provided in this Act, amounts provided by the Secretary under this Act shall be available until expended. 9. Authorization of appropriations (a) In general There is authorized to be