Rolls-Royce/Detroit Diesel Allison turbine disc failures

Anchor anecdote for the limits of the Ishikawa diagram as a problem-solving tool. Thirteen unexplained failures over ten years; blue-ribbon panel; Tom shuts down a planned hour-and-a-half walk through the fishbone diagram.

As with most things, I have a story. This story comes from what used to be called Detroit Diesel Allison. Now it's still in Indianapolis, but it's called Rolls-Royce aero engines. Rolls-Royce bought Detroit Diesel Allison from General Motors. They build aircraft engines and all kinds of other smaller engines for industrial use — typically turbine engines.