1. How many times in the past has the FBI taken over the investigation of an airplane crash from the FAA and NTB? I can't think of one.
2. Once the FBI determined there was no crime involved how come they stayed with the investigation until the end? Why did they not just drop out and let the FAA/NTB finish the investigation like what is normally done?
3. I had one more good point but it has been two long since the crash and my memory is not what it used to be.
None of those items sheds any light on the truth of the hypothesis.
1. The airplane ran on the Tarmac for several hours prior to takeoff with the packs running.
2. Uscavenged center tank fuel was heated by the packs above its flashpoint.
3. A short in a wiring harness provided a spark to ignite the fuel.
4. Boom