Suggesting a unique failure pattern for one of these hinges demands a similar artifact in the other. If inadvertent, it was repeated in its partner, quite unlikely.
By the same token, similar breaks in mirrored parts suggests rather strongly a shared defect, and most likely in design. A separate though similar component failing in virtually the same way, right?
The outstanding question, where is the aileron? In the Lake? We know they float.
The similar artifact could have been a faigue crack initiation in both (either static stress or vibratory stress). One progressed for a longer faitigue crack to failure while the other picked up the load and ending in a overload fracture from only a small pre-existing fatigue crack.
There seems to be enough of both hinge points left for an easy confirmation in a lab. Some engineer and metalurgist has no doubt seen similar in these parts and already is working out corrective action as we write these words.
We could be having this disussion in the technical session
