ATC Watcher:
Yep, I know all too well about both ( first the change in the virtual glide slope, then the RNP-AR) But if you read carefully the accident report of the TK A330 you will see the limits of the Nepalese CAA. But I do not blame them ,after these recent series of accidents we should be more inclined to help them than to blame them.
The database error at the time of the THY accident did not cause the accident. In any case, THY's flight operations management would have caught the database error had they "bench" validated the amendment to the procedure for the displaced threshold.
RNP AR is supposed to go through database validation with any amendment.