FAA Powerplant Written Practice Test

What is a common consequence of engine corrosion?

1. Improved efficiency

2. Increased fuel consumption

3. Decreased engine performance

4. Reduced emission levels

The correct answer is: Decreased engine performance

Engine corrosion typically leads to significant deterioration in the internal components, such as the cylinder walls, bearings, and other vital elements. When these components corrode, they can develop pitting, flaking, or even complete failure, which can obstruct normal engine function. As a result of this degradation, the engine may struggle to maintain optimal performance levels, leading to a noticeable decrease in overall engine effectiveness. This degradation manifests in various ways, such as reduced power output, increased friction, and potential leaks, all of which contribute to a reduction in the capability of the engine to perform as designed. The impact on engine performance is often felt during operation when the engine may produce less thrust or require more power to function, ultimately compromising its efficiency and reliability. The other options do not accurately reflect the implications of engine corrosion. For example, corrosion would not lead to improved efficiency or reduced emission levels, both of which contradict the effects of increased wear and inefficiency associated with corroded engine components. Similarly, increased fuel consumption is a possible consequence, but it is more a byproduct of decreased performance rather than a direct consequence of corrosion itself. Thus, the notable consequence of engine corrosion is indeed a decrease in engine performance.