16 Pa.C.S. § 14991: Management of sinking funds.

(a) Income.--The sinking fund commission shall annually apply the interest received on sinking fund deposits, the interest received on bonds held in the sinking fund and all other income, if any, from the sinking fund for the purpose of reducing the amount of money required to be paid by the county for sinking fund purposes for the following year, unless the income is necessary to pay the bonds of the county as the bonds mature and become payable. The income and the amount required to be paid by the county for sinking fund purposes shall annually equal the full amount required to be paid for sinking fund purposes to the several sinking funds.

(b) Sale of bonds.--The sinking fund commission may, whenever the commission deems necessary and for the best interest of the several sinking funds, sell any bonds held by the commission other than bonds of the county itself.