Which part is responsible for the reverse flow in the PT6A-67P engine?

The power turbine is responsible for the reverse flow in the PT6A-67P engine, which is a key characteristic of turboprop engines like the one used in the Pilatus PC-12 NG. The power turbine is positioned downstream of the gas generator section; it extracts energy from the exhaust gases that flow through it, converting that energy into mechanical power to drive the propeller.

In the context of the PT6A-67P, reverse flow occurs as the exhaust gases, having passed through the gas generator section where they achieve high temperatures and pressures, change direction and flow through the power turbine, which is designed to maximize efficiency in harnessing that energy. This design helps optimize the performance of the engine, especially during certain flight operations like takeoff and landing, where additional thrust may be required.

The other components, such as the gas generator section, turbine reduction gearbox, and accessory gearbox, play critical roles in the overall function of the engine, but they do not specifically manage the reverse flow of gases. The gas generator section is involved in compressing air and burning fuel to generate hot exhaust gases, while the turbine reduction gearbox connects the power output from the turbine to the propeller, and the accessory gearbox houses various engine accessories. None