How it works:
During initial operation (when the engine is cool), the blade pitch is at its lowest angle resulting in an economical (ECO) cooling mode. As the temperature begins to rise, the thermal actuators
expand to move the blades to a steeper position creating higher airflow performance. At high temperatures, the blade angle increases to its maximum pitch (POWER). Then as the engine and hydraulics
cool, the thermal elements contract and the blades return to the most economical position.