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Originally Posted by Dragonwind
To be able to hear the bearing breaking down it will have to get loud enough to overcome the casing, exhaust noise, etc. There is so much noise going on in that area that until it is toast or 'ticking' you won't hear it. Certainly would be great if it did make a lot of noise before hand!
Chris
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Earlier someone mentioned that it must have been heard, look at the damage.
I could be wrong -- but it doesn't take long to create carnage when you have metal on metal.
It is possible that the majority of the damage was caused when the bearings
finally let loose.
I'm hoping that there is a method to see the failure before catastrophe.
However the only way I can see that happening in a realistic fashion
is hope for an audible alert -- and frankly those engines make so much
noise that I doubt you could isolate it consistently.
One other possibility is diligent oil analysis, looking for some tell tale sign.
Again, I'm not sure its the proper canary.
Mike