At the moment it is Apple and Pears. Are the findings mentioned above unique with similar aged airframes of comparable types having far fewer issues?
I remember in the 60s either a much newer airframe that we filed a Special Occurence report on a high number of flights. Engines were shut down for precautionary reasons. Expected mtbf of 1000 hours was rarely achieved with 300 perhaps the norm and 30 not that rare. Later that curve became flat.
is the 135 climbing up the other side of the maintenanc e line?