This manual, Training Circular TC 3-04.10 Aviation Life Support Maintenance January 2019, provides techniques and procedures for aviation maintenance as the foundation for commanders, aviation life support equipment officers (ALSOs), aviation life support equipment noncommissioned officers (ALSNCOs), and aviation life support equipment technicians (ALSETs). It provides technical information concerning aviation life support system (ALSS) management and training programs. The principal audience for TC 3-04.10 is all members of the profession of arms. Commanders and staffs of Army headquarters serving as joint task force or multinational headquarters should also refer to applicable joint or multinational doctrine concerning the range of military operations and joint or multinational forces. Trainers and educators throughout the Army also use this publication. TC 3-04.10 applies to the Active Army, Army National Guard/Army National Guard of the United States and United States Army Reserve unless otherwise stated.