It's interesting to note that in the TG 73 empty CWT explosion, the center tank pump was running. And the packs were running at max for 40 minutes at the jetway in 93F OAT.
That airplane was 8 years old.
In 1991 a PAL 73 CWT exploded during pushback under similar conditions. That airplane was less than one year old.
Not safe to have a 115VAC pump running inside a dry tank. A Boeing design flaw.
On the DC-8 the center tank pump is inside the No.2 Main tank, a fail safe design.
The best thing to do is to pull the CWT pump CB when the tank is empty.
Stay alive.
