FAA Powerplant Written Practice Test

What are indentations on bearing races caused by high static loads called?

1. Indentations

2. Brinelling

3. Waviness

4. Pitting

The correct answer is: Brinelling

The indentations on bearing races caused by high static loads are referred to as brinelling. This phenomenon occurs when a bearing is subjected to excessive static or dynamic loads that exceed the bearing material's yield strength. As a result, small indentations form on the raceways of the bearing, impairing its function and leading to premature wear. Brinelling is particularly important to recognize in the maintenance of bearings, as it can signal that the bearing has been overloaded or inadequately supported. This can lead to increased friction and heat generation, further reducing the lifespan of the bearing assembly. Identifying brinelling early allows for corrective actions to be taken before more extensive damage occurs. Understanding this concept is crucial for ensuring the longevity and performance of rotating machinery, where proper bearing operation is essential for effective and efficient functionality. The terminology used in maintenance and repair can help assess physical conditions accurately and aid in the implementation of preventative measures.