14 CFR § 61.425

If you hold a flight instructor certificate with a sport pilot rating issued after December 1, 2024, you must establish recent experience in accordance with § 61.197.

If you hold an unexpired flight instructor certificate with a sport pilot rating issued before December 1, 2024, you must renew your certificate by establishing recent experience in accordance with § 61.197 prior to the month of expiration on your flight instructor certificate. If you fail to establish recent experience prior to the expiration of your flight instructor certificate, you may not exercise flight instructor privileges until you reinstate those privileges in accordance with § 61.427.