14 C.F.R. § 61.427 What must I do if my flight instructor certificate with a sport pilot rating expires?
Title 14 - Aeronautics and Space
You may exchange your expired flight instructor certificate with a sport pilot rating for a new certificate with a sport pilot rating and any other rating on that certificate by passing a practical test as prescribed in §61.405(b) or §61.183(h) for one of the ratings listed on the expired flight instructor certificate. The FAA will reinstate any privilege authorized by the expired certificate.
Title 14: Aeronautics and Space
PART 61—CERTIFICATION: PILOTS, FLIGHT INSTRUCTORS, AND GROUND INSTRUCTORS
Subpart K—Flight Instructors With a Sport Pilot Rating
§ 61.427 What must I do if my flight instructor certificate with a sport pilot rating expires?

