The point that the FAA made is that it doesn't matter. A plane should not be experiencing these conditions ever outside of a test environment. The concern over

The point that the FAA made is that it doesn't matter. A plane should not be experiencing these conditions ever outside of a test environment. The concern over 99.5% is splitting hairs, since at this point the plane is probably in the middle of a tornado or something Additionally, this test was done while the plane was over-pressurized, which is not required, which adds a lot of stress to the airframe, and added to the "blow up" factor.