Allan McDonald
The space shuttle Endeavor is set for liftoff tomorrow evening. One member of the crew will be Barbara Morgan, a teacher.
21 years ago, Allan McDonald was a top manager at Morton Thiokol, a company that made the booster rockets for the Challenger. The Challenger exploded just after liftoff, killing six crewmates and Christa McAuliffe, who was to be the first teacher in orbit.
Before the Challenger launched, Allan worried there was a problem and argued, unsuccessfully, for a delay. He joins Aaron to talk about what it was like to work as an engineer on the space shuttle and watch as it exploded.
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