FAA Powerplant Written Practice Test

In addition to idle speed adjustment, what must be achievable during carburetor synchronization?

1. Minimum throttle response

2. Full takeoff rpm

3. Altitude adjustment

4. Cooling idle settings

The correct answer is: Full takeoff rpm

During carburetor synchronization, achieving full takeoff RPM is crucial because it ensures that all cylinders of the engine are receiving an equal and appropriate air-fuel mixture at high power settings. This synchronization process aligns the airflow through each carburetor, ensuring that they maintain consistent performance throughout the power range. If the carburetors are not perfectly synchronized, one may supply more fuel or air than the others, which can lead to uneven engine performance, reduced power during takeoff, and possible engine roughness. Maintaining optimal performance at full throttle is essential for ensuring the engine operates efficiently and safely during critical phases like takeoff. This level of synchronization guarantees that the engine can deliver the power needed when it is most critical, thereby enhancing safety and performance. This focus on full takeoff RPM is paramount when preparing an aircraft for flight, making it an essential aspect of carburetor synchronization.