[aviator]

The final proof that it was a short circuit in the center fuel tank is that they NTSB grounded all 747’s to inspect the wiring...

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Since the center tank was empty, the fuel pump switches were still off when the flight engineer’s panel was raised from the water.

Pray tell me how a short circuit happens when the switch is off?

[Ronaldus Magnus]

Aviator, you clearly missed null and void's cleaver sarcasm. The NTSB never grounded the 747’s fleet to inspect the wiring.