PT6A free turbine engines are equipped with two controls for the use of the pilot. The first control, commonly called the power lever, is hooked up to a governor that controls the rotational speed of the aft part of the engine (the compressor, or gas generator). The second control, commonly called the propeller lever, is hooked up to a governor that controls the rotational speed of the forward part of the engine (the power section, to which the propeller is directly connected).
PT6 installations vary, some with three levers, some with two; on some the condition lever is combined with the propeller control, and on others, it's separate.