N.C. Gen. Stat. § 7A-39.6

No retired justice of the Supreme Court or retired judge of the Court of Appeals may become an emergency justice or emergency judge except upon his written application to the Governor certifying his desire and ability to serve as an emergency justice or emergency judge. If the Governor is satisfied that the applicant qualifies under G.S. 7A-39.3(a) to become an emergency justice or emergency judge and that he is physically and mentally able to perform the official duties of an emergency justice or emergency judge, he shall issue to such applicant a commission as an emergency justice or emergency judge of the court from which he retired. The commission shall be effective upon the date of its issue and shall terminate when the judge to whom it is issued reaches the maximum age for judicial service under G.S. 7A-5(b).