He does and he is pretty much talking out of his arse. Every thing that is written down In aviation usually has a really solid foundation, on why it is written down in that way.

I don't say that a plainly wrong maintenance guide is not to blame here. I'm saying that the much more likely reason, lies in less definable areas. Like bad maintenance crew training or undiscovered faults in the maintance processes, like storing badly labeled bolts with similar threading but different tolerances near each other.

may be, it could also mean that boeing didn't adequately specify the kind and amount of maintenance that has to be done. it could also mean that delta changed the maintenance procedure so much that this failure could occur.

there have been many cases where either has led to catastrophic failure