Aircraft Engine Controls - Propeller

Propeller

If the aircraft is equipped with adjustable-pitch or constant-speed propeller(s):

• Propeller Control - Used to set the desired propeller speed. Once the pilot has set the desired propeller speed, the propeller governor maintains that propeller speed by adjusting the pitch of the propeller blades, using the engine's oil pressure to move a hydraulic piston in the propeller hub.
• Manifold Pressure Gauge - Indicates the (absolute) pressure in the engine's intake manifold. When the engine is running normally, there is a good correlation between the intake manifold pressure and the torque the engine is developing.