Certified Flight Instructor (CFI) Practice Exam

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Study for the Certified Flight Instructor Exam with flashcards and multiple choice questions, complete with hints and detailed explanations. Prepare thoroughly for your upcoming exam!

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What indicates carburetor icing during flight?

A decrease in airspeed
A loss of power and decrease in RPM
An increase in fuel flow
A change in engine sound

The correct answer is: A loss of power and decrease in RPM

Loss of power and a decrease in RPM are clear indicators of carburetor icing during flight. Carburetor icing occurs when moisture in the air freezes inside the carburetor, restricting the airflow and leading to a mixture that is too rich in fuel. As a result, the engine may not receive the proper amount of air, which affects engine performance. This typically manifests as a noticeable decrease in engine power output, causing rough running and a drop in RPM. Understanding carburetor icing is crucial for pilots, as recognizing the signs early can allow for corrective actions, such as switching to carburetor heat. This helps melt the ice, restoring normal engine performance. Other symptoms related to carburetor icing can include a decrease in airspeed or changes in engine sound, but the most definitive indicators are related to the power loss and RPM drop, which directly reflects the engine's performance under ice-affected conditions.