Induction system icing is hazardous because it can do what to the fuel/air charge?

• A. Cut off the flow or vary the fuel/air ratio
• B. Improve combustion efficiency
• C. Increase fuel economy
• D. Reduce engine temperature

Answer: (A)

Induction icing disrupts the fuel/air charge by obstructing airflow in the induction system. Ice can partially or completely block the intake, cutting off the flow of air, and it can also cause the fuel/air ratio to shift because the engine’s fuel metering continues while the available air changes. The result is a loss of power and rough running, and in some cases the mixture becomes too rich or too lean, which the engine cannot tolerate. This is why induction icing is hazardous.