What are the common causes of hydraulic system failure in aircraft?

The common causes of hydraulic system failure in aircraft primarily revolve around issues related to leaks, contamination, and component wear. Hydraulic systems are vital for the functioning of several critical systems within an aircraft, such as flight control surfaces, landing gear, and braking systems.

Leaks can occur due to various reasons, including damage to hoses, fittings, or seals, leading to a loss of hydraulic fluid, which directly impacts the system's ability to generate sufficient pressure for operation. Contamination of hydraulic fluid—whether from particles, moisture, or other foreign substances—can degrade the fluid's performance and lead to early wear or malfunction of components. Furthermore, components within the hydraulic system can experience wear over time due to friction and repeated use, compromising their performance and potentially leading to failure.

Understanding these causes highlights the importance of regular maintenance and inspection of hydraulic systems to ensure optimal performance and reliability in aircraft operations. The other answer choices pertain to different aspects of aviation but do not directly relate to the hydraulic system's functionality, making them less relevant in this context.