The beta range is an important concept in turboprop engines. It refers to the positions of the power levers that lie between flight idle and maximum reverse. This range is primarily used during ground operations, especially when slowing down after landing. When the power levers are below flight idle, they directly control the pitch of the propeller blades. At ground idle, the pitch is set to allow the propeller to produce the least amount of thrust. As the power lever is pushed towards maximum reverse, the blades shift into a reverse pitch. This change directs airflow from the propeller forward, helping to reduce the aircraft’s speed during the landing roll. Additionally, it enables the aircraft to move backward intentionally.
