14 C.F.R. § 61.425 How do I renew my flight instructor certificate?
Title 14 - Aeronautics and Space
If you hold a flight instructor certificate with a sport pilot rating you may renew your certificate in accordance with the provisions of §61.197.
Title 14: Aeronautics and Space
PART 61—CERTIFICATION: PILOTS, FLIGHT INSTRUCTORS, AND GROUND INSTRUCTORS
Subpart K—Flight Instructors With a Sport Pilot Rating
§ 61.425 How do I renew my flight instructor certificate?