What is a sign of uncommanded feather?

In the context of uncommanded feather, the observation of higher torque is significant. Uncommanded feather refers to a situation where a propeller blade rotates to the feathered position without pilot intent, typically due to malfunction or failure and leads to changes in the aircraft's performance. When a propeller feathers, it reduces drag but can also lead to a significant loss of thrust from the affected engine.

As the aircraft continues to demand power, the remaining operational engine(s) will work harder to compensate for the lost thrust, resulting in higher torque readings. This increased torque indicates that the remaining engines are producing more power than normal to maintain performance.

Higher torque can be a critical indicator for pilots to understand that there is an issue with one of the propellers and they need to address it promptly, usually by adjusting throttle settings or planning for an emergency landing. Ultimately, recognizing these signs allows for timely corrective actions that enhance safety.