So, what if they find such particles? – Conclude that the Type B gear/bearing spalls at or before 300 FH? That wouldn’t be good, would it?
Or, what if they don’t find any? – Eureka!? Or maybe ‘Hey Presto’? The Type B’s are safe??? Try again at 600 FH, 900 FH etc…?
Sounds logical. Did we get to the bottom of the process that identified a batch of drive shafts in a previous event?