(…) For a start, there are two different cracks being investigated:
Hairline cracks around fastener holes in the internal wing structure, and
Cracks at the edges of the vertical web of the feet.Airbus
The fastener holes are located in “rib feet” which are L-shaped brackets extending from the wing rib for attaching to the aircraft skin, using bolts through these holes. It is my understanding that it is the rib-feet attached to the lower skin which have this problem. (…)
