I just don't get it. The FAA Airworthiness Directive seems terribly inadequate. All the posts on this and other forums on composite structures tell of the difficulty in adequately (non-destructive) testing of composite material. How is a cursive visual inspection (literaly "lights" and "mirrors") going to determine the structural integrity of the vertical stab?
I would have thought that perhaps the newer aircraft in the fleet could initially be subject to less scrutiny, but the older higher time/cycle aircraft be inspected more thouroughly.
Comments from some engineering types?