Originally Posted by
EEngr
One fan blade or the entire fan?
1 blade, if the whole fan comes off then the imbalance (and hence vibration) is far less so 1 FBO is worst case in terms of dynamic vibration.
I'm seeing reports from passengers of high vibration, therefore it was possibly a FBO event that was contained (blade in the bypass duct) but some secondary and perhaps further failures leading to fan loss but it would have had to have been a very rapid failure sequence as the fan slows and hence has reduced loading.
That blade in the duct also appears to still have it's root; It could be a red herring, defo not a black Griffon........
This is indeed a curious one.