(a) Employment or activity as a ground instructor giving pilot, flight instructor, or ground instructor training;
(b) Employment or activity as a flight instructor giving pilot, flight instructor, or ground instructor ground or flight training;
(c) Completion of an approved flight instructor refresher course and receipt of a graduation certificate for that course; or
(d) An endorsement from an authorized instructor certifying that the person has demonstrated knowledge in the subject areas prescribed under §61.213(a)(3) and (a)(4), as appropriate.
[Doc. No. FAA–2006–26661, 74 FR 42562, Aug. 21, 2009]