Which rating is responsible for maintaining aircraft hydraulic systems?

The Aviation Structural Mechanic (AM) rating is specifically responsible for maintaining and troubleshooting aircraft hydraulic systems. This role encompasses a broad range of duties related to the structural integrity and mechanical systems of aircraft, including but not limited to hydraulic systems, which are critical for various aircraft functions such as landing gear operation, flight control surfaces, and braking systems.

Aviation Structural Mechanics receive extensive training on hydraulic components and systems, enabling them to diagnose and repair issues effectively. Their knowledge of hydraulic principles, system design, and maintenance procedures is vital to ensuring the operational safety and reliability of the aircraft.

In contrast, the other roles listed, such as Aviation Support Equipment Technicians, Photographer's Mates, and Plane Captains, have different primary responsibilities that do not focus on the maintenance of hydraulic systems. The AS rating deals with the maintenance and repair of support equipment rather than aircraft systems. The PH rating focuses on photography and documentation, which is unrelated to mechanical maintenance. The Plane Captain oversees the daily operations of an aircraft but does not perform in-depth maintenance on systems like hydraulics. Thus, the specialization and training of the Aviation Structural Mechanic make them the correct choice for this role.