HC - there is a common theme however in all of those accidents. Somewhere in the chain someone has accepted a standard that was unacceptable. Why? HUMS Warnings not heeded or used, inadequate maintenance guidlines, SOPs ignored, possibly ineffective training, the acceptance of compromise where it is not required. If I had time it would not take long to do a more detailed analysis of some basic failings and causal factors across the board. There is of course a pilot centric element, as their should be. It is the visible part of the "iceberg" in this case. It is where things finally manifest. I keep asking myself "how the hell have we let it go so far?" These are crew room discussions we have been having for years. There is nothing that new here.