Another one would be the recent Turkish AMS accident.
I would be very surprised if one could generate any meaningful statistics on this, because the overall numbers are very small.
I checked Aviation Safety Network on a couple of accidents involving check airmen and crew being checked out, and it wasn't mentioned. Overall, I think most Annex 13 accident reports are not public, so that would suggest that only ICAO can generate meaningful data.
In none of the accident reports of which I am aware does the phenomenon that one crew member was a check airman checking out the other occur in the list of causal factors.
Intuitively, one could imagine that the check-ride situation might bear some similarities with strong-hierarchy situations as apparently found continually, according to Boeing, in certain airlines. And phenomena directly related to that social feature does occur in causal-factor lists. For example Korean Air Guam.
PBL