FAA Powerplant Written Practice Test

What can excessive oil temperature lead to in an aircraft engine?

1. Improved engine performance

2. Accelerated wear and potential failure

3. Increased fuel efficiency

4. No impact on engine integrity

The correct answer is: Accelerated wear and potential failure

Excessive oil temperature in an aircraft engine is a critical issue that can lead to accelerated wear and potential failure of engine components. High oil temperatures can diminish the lubricating properties of the oil, causing it to lose its viscosity and effectiveness in reducing friction between moving parts. This can result in increased metal-to-metal contact, leading to greater wear on components such as bearings, pistons, and cylinder walls. In addition, high oil temperatures may cause thermal breakdown of the oil itself, resulting in the formation of sludge or varnish which can obstruct oil passages and further inhibit proper lubrication. This scenario not only accelerates wear but can also lead to catastrophic engine failure if critical components overheat and seize up due to inadequate lubrication. Understanding the impact of oil temperature on engine performance is crucial for maintaining engine health and ensuring safety. Thus, monitoring and managing oil temperature is an essential aspect of engine maintenance and operation to prevent these serious issues.