The allegations were initially reported in the Washington Post back in 2006:
Boeing Parts and Rules Bent, Whistle-Blowers Say - washingtonpost.com
I don't particularly agree with AlJazeera suggesting these components were responsible for any airframe breaking up, but the allegations of the whistle-blowers are far from baseless.
Doesn't this NG allegation remind you of the "
9/11 truthers" story about the WTC collapse sequence resembling a controlled demolition?
Not in the least.