Miss. Code Ann. § 19-13-21

The board of supervisors of any county which owns any tractor, truck, or other road machinery or equipment, or any district of which owns any such machinery or equipment, may at any time have the same repaired, or purchase necessary repair parts therefor, where it is necessary to use the machinery or equipment in constructing, reconstructing or maintaining the public roads, whether or not there is then a sufficient amount in the fund out of which the cost thereof must be paid to pay the same. The claim for the repairs or repair parts shall be allowed in due course when filed, and be paid in its proper order as other claims. However, if any repairs herein permitted to be made after the first day of July of the last year of the term of office of the members of the board making such repairs shall exceed the sum of Five Thousand Dollars ($5,000.00), the repairs shall not be made unless and until the board of supervisors, or a majority of the members thereof, shall have authorized the making of the repairs at a regular meeting of the board, or a special meeting called for that purpose.