EC225 crash near Bergen, Norway April 2016

[Concentric]

Originally Posted by turboshafts

I still don´t agree to the fact that LN-OJF had "no" spalling Before the breakdown.

I should say that I did not mean to imply in my post that there was ‘no’ spalling (i.e. zero) on the recovered fragments, but rather 'no notable spalling' and not enough to be detected. To my mind a notable or significant extent of spalling would be similar to that shown in Fig 33 in the AAIB report 2/2011 and that was associated with a crack that had not yet reached fracture. My personal experience is with much larger machinery bearings where spalling would often be measured in several square inches.
The extent of spalling in the CT scan Fig 6 in the AIBN preliminary report is minimal in comparison to Fig 33.