For how long are AD compliance records required to be retained?

The correct answer indicates that compliance records for Airworthiness Directives (ADs) must be retained until the aircraft is sold. This requirement is crucial for maintaining the safety and airworthiness of the aircraft, as it provides future owners with a complete history of compliance with regulatory mandates. Keeping these records until the aircraft changes ownership ensures that crucial maintenance history, necessary modifications, and any compliance or non-compliance with directives are transparent.

This practice supports both regulatory compliance and helps new owners understand the operational history of the aircraft, avoiding potential safety risks. It also aligns with the principles of traceability and accountability within aviation maintenance and operations. Therefore, retaining AD compliance records until the aircraft is sold is an important measure to protect both operators and regulatory bodies by ensuring continued airworthiness.