Comment by class3shock

There is nothing here to say it being a maintenance issue is doubtful. It could quite literally be a similar issue to Flight 191, we don't know yet.

It did have ample engineering reserve beyond the load it was subject to... before fatigue damage initiated a crack which then grew until there was no reserve left. The question is why the fatigue crack initiated prematurely? Maintenance damage? Analysis mistake? We don't know yet.