Interesting isn't it:-
Aircraft equipped with nitrided shafts:- All EC225/725, as the nitrided shaft is the only design certified for this aircraft type.
- Some AS332/532 are also equipped with nitrided vertical shafts and as a consequence they are also concerned by the limitation
The first-generation carburized vertical shafts are not concerned.
One assumes they have now moved on from the shaft numbers M330 after the production change and now are focused on material spec. Although it will be interesting to see what changed that view other than simply running down a failure list that was available in the summer.