The second design challenge is are the bearing assemblies.

Contamination in the lubricant is abrasive and greatly reduces the operating life of the bearing assembly.

The bearing assembly consists of two races, essentially grooved tracks for ball bearings.

This method has been used to test the flatness of surfaces and the trueness of a bearing assembly.

The bearing assembly which allows the crankarms to rotate relative to the frame.

He lingered for another two hours shaking his head and mumbling bitterly over the massive bearing assembly in the long narrow shaft tunnel.

Modifications of the design include longer blades and a new bearing assembly.

The balls are inserted through the gap and then evenly distributed around the bearing assembly, causing the races to become concentric.

The cracks were considered too small to cause trouble in flight, but if such cracks widened and split the bearing assembly, they could cause an explosion.