I am not sure if this directive covers the "butt straps" which are used to tie the various sections of aeroplanes together. They are strengthening pieces of metal which overlap the joints, ie the fwd fuselage to the wing box etc. I have noticed there has been an alarming increase in 737s breaking at these points in minor crashes. They are obviously weak points in an a/c and as such need to be oversized and stronger than the surrounding structure. The TV program mentioned above is well worth viewing.