S.C. Code § 15-9-390
Service of process upon the Secretary of Commerce, as agent of the nonresident operator of any aircraft which has set down in South Carolina, shall be made by leaving a copy thereof, with a fee of four dollars, in the hands of the Secretary of Commerce or his office and such service shall be sufficient service upon the nonresident if notice of the service and a copy of the process are forthwith sent by certified mail by the plaintiff or the Secretary of Commerce or his designee to the defendant and the defendant's return receipt and the plaintiff's affidavit of compliance herewith are appended to the summons or other process and filed with the summons, complaint and other papers in the cause. The Secretary of Commerce or his designee shall keep a record of all processes which shall show the day and hour of service upon him. When the certified return receipt shall be returned to the Secretary of Commerce or his designee, he shall deliver it to the plaintiff on request and keep a record showing the date of its receipt by him and its delivery to the plaintiff.
S.C. Code § 15-9-390