Word: prestart
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...mazes of wires that fill the control cabinets. The start-up countdown begins in earnest. Engineers watch the gauges as the needles begin to move. An exacting series of 14 conditions must be met before the computer will allow operation to start. When the computer is satisfied, the green prestart light goes on, the master control switch is turned to start, and the gates that let water into the turbine are opened. The generator begins to turn, slowly at first, then quickly builds to its 300 r.p.m. speed. A high-pitched hum fills the building, but the generator...
Pilot Smith was given the order to prestart the auxiliary power units that would operate Challenger's control surfaces and swivel its engine nozzles. The last pints of oxygen were pumped into the external tank...
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