This advisory circular: 1. Describes the basic concepts of human fatigue and how it relates to safety for aviation maintenance organizations and individual maintainers. 2. Provides information on Fatigue Risk Management (FRM) in terms of fatigue hazards and mitigation strategies specific to aviation maintainers. 3. Describes the benefits of implementing FRM methods within aviation maintenance organizations. 4. Identifies methods for integrating FRM within a Safety Management System (if applicable).