1.   In the event of a power failure, most companies have standby diesel generators to power the pumps.

2.   Their closed-cycle engines, often using a clever process known as staged combustion, begin the explosive burning of fuel in a preburner that powers pumps.

3.   They included importing a generator from an independent contractor to power the pumps that transfer fuel to airliners from underground tanks.

4.   Those wires, which power the pump for the center tank, also run in conduits through the wing tanks.

5.   The pump is powered by batteries and monitored by an electronic controller, both of which Hege carries around in a pack.