Originally Posted by
JohnBurke
Other than to maintain the lighting in the winglet, there is little maintenance to perform, but the only suggestion as to the loss occurs in a FAA statement that it failed in moderate to severe turbulence. No further information is given, meaning anything further is unfounded speculation.
The "investigation" is complete and they already know what happened.
There is a service bulletin about inspecting the enhanced winglet attach structure, and a modification that should be done at a heavy check. It was not done on this particular plane.
I bet the bulletin will be an AD very soon.