When is a teardown inspection on an engine necessary?

A teardown inspection on an engine is necessary when a component fails or an accident occurs because this is crucial for thoroughly assessing the extent of the damage and understanding the underlying causes of the failure. This type of inspection involves disassembling the engine, which allows mechanics to visually and physically examine each component for wear, fatigue, or any other issues that may not be apparent through standard inspection methods.

Such inspections not only help identify the precise nature of the failure, but they also serve to uncover any contributing factors that could lead to further problems or unsafe operating conditions. This level of scrutiny is essential for ensuring that the engine is fully safe and reliable for further operation.

While there are guidelines for routine inspections and maintenance schedules, they do not replace the need for detailed teardown inspections following failures or accidents, as these events necessitate a more in-depth evaluation to maintain the overall safety and performance of the aircraft engine.