Originally Posted by
Harley Quinn
Isn't this issue similar to what is thought to have brought TWA800 down? As a layperson I wouldn't be surprised to learn this system was similar to that in the ill-fated 747.
Yes. This is pasted from the AD preamble:
The Boeing SFAR 88 report for the Model 727 showed that a combination of an in-tank wire fault or contamination condition (which can remain latent for multiple flights) and a hot short outside of the tank between the affected FQIS tank circuit and other aircraft power wiring cobundled with FQIS tank circuit wiring could result in an ignition source in the fuel tank. That combination of failures was classified by the FAA as a “known combination of failures” under the criteria in the policy memo due to the similarity of the Model 727 FQIS system architecture and design details to those of the Boeing Model 747 airplane involved in the TWA Flight 800 catastrophic fuel tank explosion accident in 1996. The National Transportation Safety Board (NTSB) concluded that an FQIS failure combination as described above was the most likely cause of that accident.