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This not a new issue unfortunately. In the 70's a number of RR TSIO 360 engines were installed on T337G's (P337's) by various entities (engine shops, MRO's etc.). In a number of cases, the FAA became aware and forced the removal of the RR engines as they were never certified in the US in the first place.
I owned N78C a while back and the log books contained several entries including paperwork from the FAA forcing the removal of the RR engines shortly after installation. The FAA had been notified by a shop doing maintenance on the airplane...
It would be interesting to find out how some owners overcame that hurdle.
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