What is the primary function of the hydraulic system in the Cessna 172?

The primary function of the hydraulic system in the Cessna 172 is to drive fluid through lines to actuators. In this aircraft, the hydraulic system plays a crucial role in operating various components that require force beyond what can be generated manually. For instance, the hydraulic system operates the flaps and the brakes, allowing the pilot to control these functions efficiently and effectively.

Hydraulic systems use pressurized fluid to transmit power, which is why the ability to drive fluid through lines is essential. This system can amplify force, providing smooth and precise control of aircraft systems, enhancing safety and performance.

The other options do not accurately reflect the function of the hydraulic system. The hydraulic system does not provide power to the electrical system, cool engine components, or control cabin temperature. Each of those functions is managed by separate systems within the aircraft, underlining the specific and vital role hydraulic systems play in flight operations.