How long is a knowledge test valid for in aviation?

The correct duration for a knowledge test in aviation is 24 calendar months. This means that once a pilot or applicant successfully passes the knowledge test, they have a period of two years to use that test result towards meeting the requirements for a certificate or rating. After 24 months, the test results are no longer valid, and the individual would need to retake the knowledge test to proceed with their goals in aviation.

This timeframe is designed to ensure that aviators keep their knowledge current and are aware of the latest regulations, procedures, and best practices in the ever-evolving field of aviation. Given the nature of aviation and the importance of staying updated with new information, this 24-month policy helps maintain safety and operational standards within the industry.