Sensor assembly to detect propeller whirl in a turbine engine

A method of detecting propeller whirl of a fan for a turbine engine, the method comprising:

• controlling a plurality of fan blades to a predetermined pitch angle;
• rotating the plurality of fan blades in a circumferential direction;
• detecting, with one or more sensors, at least one of a holding torque of all of the plurality of fan blades together or a holding torque of at least one fan blade of the plurality of fan blades;
• comparing the holding torque with a baseline data associated with the plurality of fan blades;
• detecting propeller whirl of the plurality of fan blades based on the comparing when the holding torque is outside a predetermined range;
• and
• taking corrective action to mitigate the propeller whirl when the propeller whirl is outside of a predetermined limit, wherein the corrective action includes micro-pitching at least one of the plurality of fan blades to cancel out the holding torque associated with the propeller whirl.