Jeppesen Powerplant Orals Practice Test

Induction icing occurs when moisture in the air freezes within the engine induction system, particularly in the air intake, carburetor, or fuel injectors. When this icing occurs, it can impede airflow into the engine, significantly affecting its performance.

The presence of ice restricts the airflow that is essential for combustion. As a result, the engine receives less air than required for optimal performance, leading to a power reduction. This reduction in airflow means that the engine produces less thrust or horsepower than it normally would under standard conditions.

Additionally, induction icing can also lead to engine roughness and instability because of uneven fuel-air mix resulting from the reduced airflow, further detracting from overall power output. These factors explain why induction icing results in a power reduction in an aircraft engine.