FAA Powerplant Written Practice Test

In a large aircraft with a turboprop installation, how is the propeller controlled?

1. By the flight control yoke

2. By the engine power lever

3. By manual cockpit controls

4. By electronic throttle control

The correct answer is: By the engine power lever

The propeller in a large aircraft with a turboprop installation is primarily controlled by the engine power lever. This lever is directly linked to the engine's power output and thus controls the amount of thrust produced by the propeller. When the power lever is positioned forward, it increases the engine's fuel flow, generating more power and consequently more thrust from the propeller. Conversely, when the lever is pulled back, it decreases the power and thrust. Understanding the function of the engine power lever is crucial for managing both propeller speed and engine performance during various flight phases, such as takeoff, cruising, and landing. The interaction between engine throttle settings and propeller pitch adjustments is vital for optimal efficiency and performance in turboprop operations. While there may be other methods of controlling aircraft systems, the power lever is the primary means of propeller control in turboprop-equipped aircraft, making it an essential component for pilots to master in order to ensure safe and effective flight operations.