Allison 250-C20 Turbine Wheel. P/N 6877092-R. It is exceptionally clean and visually it checks out ok from what I can tell but I don't know anything about the history of it and I do not have any paperwork for it. Wheel will have to be inspected to make sure it is airworthy before it can be put back on an airplane. Can be used for a ground unit though. Sold as is, no returns. High $$ part!!