How do I renew a flight instructor certificate that has already expired?
You cannot renew an expired certificate. The FAA refers to this as a ‘reinstatement.’ To reinstate your license, you must take a checkride; one ride will renew all the ratings listed on your expired flight instructor certificate. Although participating in a FIRC would be beneficial from a knowledge standpoint, it could not be used as the basis for your reinstatement. You do not need to take the Knowledge Exam again, to reinstate your license.