Which maintenance activity is critical for ensuring hydraulic systems function correctly?

Pressure testing and leak checks are critical maintenance activities for ensuring hydraulic systems function correctly because they help identify any potential failures or weaknesses in the system. Hydraulic systems rely on the containment of fluid under pressure to operate effectively. Leaks can result in loss of pressure, leading to reduced operational efficiency and potential system failure.

By conducting regular pressure tests, technicians can verify that the system is holding pressure within specified limits, and leak checks can help locate any leaks before they lead to serious issues. This proactive approach not only ensures the safety and reliability of the hydraulic system but also extends its service life, prevents costly repairs, and maintains overall aircraft performance.

In contrast, regular visual inspections can help identify obvious issues but may not detect problems that could lead to failure. Greasing parts weekly may be a maintenance requirement for certain components, but it does not directly address the integrity of the hydraulic system itself. Ignoring minor issues runs the risk of those issues developing into significant problems, which could compromise system performance. Focusing on pressure testing and leak checks provides a comprehensive understanding of the hydraulic system's health.