@lomapaseo (#421), I am still curious, although indeed the matter which is the subject of that AD may or may not be related to this incident. I assume, in case of a positive result, it has to be fixed right away before returning it to service. Perhaps also some more extensive inspection is triggered? So in fact it would not (should not) be possible to learn how fast the cracks develop, from these inspections alone. And therefore, I do not see how to measure the effectiveness of this AD alone.