How long must flight instructor records be retained according to regulations?

Flight instructor records must be retained for a minimum of three years according to federal aviation regulations. This retention period ensures that the instructor's qualifications, training, and any relevant endorsements are documented and available for review. Maintaining accurate and complete records for this duration helps both the instructor and their students, as it supports the verification of the instructor's credentials and the proficiency of their training methods. This three-year period aligns with the regulatory framework that aims to uphold a standard of accountability and safety within aviation training.