Certified Flight Instructor - Flight Instructor Airplane Practice Exam

What is the effect of incorrect fuel/air mixture during flight?

1. Increases engine efficiency

2. May lead to engine overheating

3. Improves fuel economy

4. Reduces engine noise

The correct answer is: May lead to engine overheating

The effect of an incorrect fuel/air mixture during flight can indeed lead to engine overheating. When the mixture is too rich (too much fuel relative to air), it can cause the engine to run cooler, but if it is too lean (too much air relative to fuel), it can create excessive heat in the combustion chamber because the engine runs less efficiently and the fuel isn't effectively cooling the engine components. This overheating can damage engine parts, leading to significant issues during flight. In the realm of engine performance, the proper fuel/air mixture is crucial for optimal combustion and engine function. If the mixture is not correctly adjusted, it can adversely influence the engine's thermal efficiency and lead to overheating conditions. Understanding this balance is essential for ensuring that the engine operates within safe temperature ranges and prevents potential mechanical failures during flight.