But then -
What explains the
PR 737 ground explosion in 1990 that preceded TW800? Wasn't it unequivocably the center tank?
And don't forget - early B-47's used to inexplicably blow up in the landing pattern after long training missions. The problem went away after changing out the DC fuel pumps (w/commutators) for AC pumps. (This from an ex-SAC pilot who lost a colleague or two in the 50s)