Certified Flight Instructor - Flight Instructor Airplane Practice Exam

What effect do excessively high engine temperatures have on an aircraft engine?

1. Cause damage to heat-conducting hoses and warping of the cylinder cooling fins.

2. Cause loss of power, excessive oil consumption, and possible permanent internal engine damage.

3. Not appreciably affect an aircraft engine.

The correct answer is: Cause loss of power, excessive oil consumption, and possible permanent internal engine damage.

Excessively high engine temperatures can have a significant and detrimental impact on an aircraft engine, leading to loss of power, excessive oil consumption, and potentially permanent internal engine damage. When engine temperatures rise beyond normal operating levels, it can indicate that the engine is not cooling properly. This excessive heat can cause the engine components to expand beyond their design limits, which leads to a loss of efficiency and power output. Moreover, high temperatures can accelerate oil breakdown, causing it to lose its lubricating properties. This deterioration results in greater oil consumption as the engine may require more oil to maintain lubrication at elevated temperatures. Over time, continual exposure to high temperatures can result in serious internal damage, such as scoring of the cylinders or warped engine components, which may be irreversible and necessitate extensive repairs or complete engine replacement. This understanding is crucial for pilots and instructors, as maintaining optimal engine temperatures is essential for the longevity and reliability of the aircraft's engine. Monitoring engine temperatures consistently allows for early detection of potential issues that could lead to more severe damage if not addressed promptly.