What should be monitored when using the hydraulic systems on the aircraft?

When operating the hydraulic systems on an aircraft, it is crucial to monitor fluid levels and pressure. The hydraulic system relies on fluid to transmit power to various components such as landing gear, flaps, and brakes. Maintaining the appropriate fluid levels ensures that the system can function properly and efficiently. Insufficient fluid can lead to inadequate pressure, which might compromise the operation of critical systems and could potentially lead to system failure.

Additionally, monitoring fluid pressure is essential. If the pressure is too low, it can indicate leaks or other malfunctions within the system. Conversely, excessively high pressure could indicate a blockage or malfunction as well, which could lead to failure. Therefore, ensuring that both fluid levels and pressure are within the specified limits is vital for the safety and reliability of the aircraft’s hydraulic systems.

Monitoring other options like voltage levels or temperature settings is not directly related to the hydraulic systems and would pertain more to electrical systems or thermal management, respectively. Fuel capacity, while critical for overall aircraft operations, does not affect the hydraulic systems directly.