Air Transport Association (ATA) Codes Practice Test 2026 – Your All-in-One Guide to Mastering ATA Codes!

Understanding how ATA chapters are organized helps you quickly identify where a system’s information lives. Hydraulics are the system that provides pressurized fluid power to move flight controls, brakes, landing gear, and other actuators. The chapter dedicated to hydraulic power covers the components and procedures for that system—pumps, reservoirs, valves, actuators, lines, power packs, and the related maintenance tasks.

That’s why focusing on the Hydraulic Power chapter is the best fit for questions about hydraulic power. Other chapters address different areas: Equipment / Furnishings covers cabin fittings, Landing Gear covers the landing gear system, and Navigation covers navigation equipment and related systems.