What is one of the requirements to renew a CFI certificate if it hasn't expired?

To renew a Certified Flight Instructor (CFI) certificate that has not expired, completing an Approved Flight Instructor Refresher Course (AFIRC) is a requirement. This course serves as a mechanism to ensure that CFIs remain current with instructional techniques, regulations, and safety practices in aviation. The course is designed to enhance the instructor's teaching skills and knowledge, which is vital for effective flight instruction.

While specific endorsements or passing rates can be beneficial for a CFI's practical experience and effectiveness, they are not formal requirements for the renewal process itself. The focus on continuing education through the refresher course helps maintain a high standard of instruction and keeps instructors abreast of any changes in the aviation industry.