What is the function of the hydraulic system in an aircraft?

The hydraulic system in an aircraft is primarily responsible for transmitting power to various systems, which include control surfaces like ailerons, elevators, and rudders, as well as for operating landing gear and brakes. This power transmission is essential for the effective and efficient operation of these critical components, allowing for smooth and responsive control of the aircraft.

Hydraulic systems utilize fluid to transmit force, which enables pilots to operate heavy components with relatively little mechanical effort. This capability is vital, particularly in larger aircraft where control surfaces and landing gear mechanisms are substantial and require significant force to move.

In contrast, the other options do not align with the primary function of the hydraulic system. Cooling engine components, providing electrical power, and fueling the combustion engine fall under different systems within the aircraft, such as the engine cooling system, electrical systems, and fuel systems, respectively. Understanding the specific functions of various aircraft systems is crucial for effective maintenance and operation.