Commercial Pilot License (CPL) Practice Exam

Hydraulics play a crucial role in the operation of various aircraft systems, and the deployment of landing gear is one of the most common applications. Hydraulic systems use pressurized fluid to create mechanical motion, allowing for the effective and reliable operation of larger components. In the context of landing gear deployment, hydraulic systems enable the landing gear to smoothly extend and retract, ensuring safe and efficient operations during takeoff and landing.

The other systems mentioned, while vital to an aircraft's operation, typically do not utilize hydraulics. For example, the fuel system is designed to transport fuel to the engines and relies on gravity and fuel pumps rather than hydraulic mechanisms. Navigation instruments are electronic systems that operate using electrical signals and sensors, while the electrical system itself is responsible for distributing power throughout the aircraft but does not use hydraulics. Understanding these distinctions helps clarify the essential role that hydraulic systems play in specific aircraft operations, particularly in the deployment of landing gear.