I just thought of another possible scenario. Somebody might have attempted to "overhaul"
it by cutting off the the original turbine and welding on another relatively good
used turbine.

Paul Lamar

I had a failure once where the outer oil seal leaked oil into the exhaust stream -- crystalization accumulated in the form of a steadily growing pyramid until finally it became high enough to interfere with and stop the turbine.  In the case shown here, it is conceivable that such a buildup occurred, broke off in a large chunk with the turbine at high rpms, causing the failure.  Pure speculation----

Bob

ERuttan wrote:

Bob that's it.

John stated a witness saw a large plume of white smoke when he lost
power, likely the oil seal failed and dumped oil into the exhaust.

The accumulation would have caused the stress right at the seal and
snapped off the turbine right where it broke.
 

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