One thing that I note is that this type of duplex bearing might not be suitable to this application. Obviously, failure of the bearing in this installation can lead to loss of the aircraft. The predicted life / failure rate of the bearing might appear very good but, is it satisfactory in such a critical component? Packed and sealed bearings will fail when the lubricant leaks out and / or water or other contamination gets in. The internal structure of the bearing may also promote early failure if the grease fill from both of the races can all leak out or, if the contamination or debris can migrate internally from one race to the other. This accident bearing is described as packed with debris and, in general terms, this is an issue with sealed lubrication. A similar bearing with oil circulation lubrication may avoid debris packing and, any debris particles from a failing bearing may be detected early with monitoring of the lubricating oil.
OAP