What power sources are used to operate aircraft windshield wipers?

The operation of aircraft windshield wipers typically relies on hydraulic pressure and electricity, making this the correct answer. Hydraulic systems provide the necessary force to handle the demanding task of moving the wipers, especially in larger aircraft where mechanical resistance is higher. This hydraulic power allows for more robust and effective wiper movement compared to purely electric systems.

Electricity is utilized to control the operation of the wipers, ensuring they can be activated and adjusted from the cockpit with precision. The combination of hydraulic pressure for movement and electrical systems for control streamlines the functionality of the wipers, allowing them to respond quickly to pilot inputs and effectively clear the windshield of water and debris in various flying conditions.

While other options incorporate various power sources, they do not align with the common engineering practices found in aircraft design for windshield wiper systems. For example, using solely battery power or manual operation lacks the efficiency and reliability required in aviation. Similarly, reliance on solar power or pneumatic pressure is not a standard practice for this particular application in current aircraft designs. The synergy of hydraulic pressure and electrical control remains the optimal solution for achieving effective and reliable windshield wiper operations.