Glimmerings

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April 18, 2005

the Apollo 13 rescue

Four months earlier, Aaron had saved the Apollo 12 mission when, during launch, the rocket was struck by lightning—twice. The second strike knocked the CSM's fuel cells off line, sent the guidance system spinning, and scrambled telemetry to the ground. With warning lights blazing and alarms sounding, it looked like the crew would have to abort the mission, scant seconds after liftoff.

Aaron was in the EECOM's seat for the launch, and as he watched the scrambled data ripple across his console, he was suddenly reminded of a ground test he had seen a year earlier where an electrical malfunction had caused a similar problem. The crazy pattern of the data on his console "was a pattern that I remembered," says Aaron. And, thanks to hours of research he'd put in after the ground test, he knew how to fix it. He uttered the terse command, "Set S.C.E. to Aux," to his flight director, Jerry Griffin. Griffin, like everyone else in mission control, had no clue what that meant. Nevertheless, trusting in his EECOM, Griffin ordered the command to be passed up to the crew immediately. The corresponding switch was flipped onboard and valid telemetry was restored. With valid data, Aaron could see that the fuel cells were off line, and with a second command to reset the cells, Apollo 12 was on its way to moon. The incident cemented Aaron's reputation as a "steely-eyed missile man."

Apollo 13, We Have a Solution

Posted by thdyck on April 18, 2005

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