Crack Presto 2013 Megal

Here is an example of a crack in thinner material, in this case the al. is between 2 and 3 mm thick and the crack has grown each side of the rivet to a total length of about 25mm. The crack is long enough so that as the crack opens and closes, a black fretting material is produced which in this case gave away the location which was well out of sight and photographed with a camera poked into an inspection hole. After finding this crack we checked the same location on the other wing and hey presto, a mirror image.

Crack Presto 2013 Megal