How does the hydraulic system operate in relation to the landing gear?

The hydraulic system in an aircraft plays a crucial role in the operation of the landing gear by generating pressure to actuate the gear mechanism. This process involves utilizing hydraulic fluid within a closed system, which can be pressurized to either extend or retract the landing gear as needed.

When the pilot or the automated systems command the landing gear to move, the hydraulic pump supplies pressure to the landing gear actuators. These actuators then translate that hydraulic pressure into mechanical movement, allowing the gear to extend for landing or retract after takeoff. This system is typically preferred in modern aircraft due to its efficiency and reliability, as it can handle the significant forces involved in deploying and stowing heavy landing gear mechanisms.

The other options relate to different aircraft systems and functions. Navigation, engine power, and cabin air pressure management all operate independently from the landing gear's hydraulic control system.