AMP - Aviation Maintenance Technician Powerplant Practice Exam

What is a common cause of engine failure?

1. Improper fuel mixture only

2. Mechanical failures such as turbine blade fracture or fuel system malfunction

3. Excessive lubrication

4. Normal wear and tear during routine operations

The correct answer is: Mechanical failures such as turbine blade fracture or fuel system malfunction

A common cause of engine failure is indeed mechanical failures such as turbine blade fractures or fuel system malfunctions. Mechanical failures can occur due to a variety of reasons, including manufacturing defects, material fatigue, or inadequate maintenance practices. For instance, a turbine blade that fractures during operation can precipitate a catastrophic failure of the engine because these components endure extreme stresses and temperatures. Additionally, if there is a malfunction within the fuel system, it could lead to inadequate fuel delivery, resulting in loss of power and potentially causing the engine to fail. In contrast, while improper fuel mixture can affect engine performance and efficiency, it is not typically characterized as a direct cause of complete engine failure in itself without other contributing mechanical issues. Excessive lubrication is generally not a common cause of engine failure, as proper lubrication is crucial for engine health, although an imbalance in lubrication could lead to performance problems. Normal wear and tear is an expected aspect of engine operation; while it can lead to performance degradation over time, it does not directly translate to sudden engine failure unless severe wear is neglected. This context helps to clarify the importance of mechanical integrity and system functionality in the prevention of engine failures.