What trigger indicates a potential hydraulic failure?

The potential hydraulic failure can be indicated by a loss of braking capability. In aircraft systems like the T-6A, hydraulic power is essential for various operations, including braking. When there is a hydraulic failure, the brakes may not function properly, which poses a significant safety risk. This loss of capability can occur suddenly, providing a clear and critical indication that something is wrong with the hydraulic system.

In contrast, noise from the hydraulic system may not directly correlate with failure, as some operational sounds could be within normal limits. An increase in engine RPM is typically related to engine performance and does not provide direct information about the hydraulic systems. Flashing warning lights on the dashboard may indicate various issues, but they are often multifaceted and not exclusively tied to hydraulic problems. Hence, the direct correlation between braking capability and hydraulic function makes loss of braking capability the most effective indicator of a hydraulic failure.