EVENT
The Ninety Seconds
The interval between the ignition of the Challenger's solid rocket boosters on the morning of January 28, 1986, and the moment when the external fuel tank breached — the ninety seconds during which the accumulated normalized deviance of twenty-four previous flights became the disaster of the twenty-fifth.
At 11:38 a.m. EST on January 28, 1986, the Space Shuttle Challenger launched from Kennedy Space Center in conditions colder than any previous shuttle flight. The O-rings sealing the aft joint of the right solid rocket booster, having lost resilience in the overnight cold, failed to maintain their seal. Hot combustion gases began escaping through the joint within seconds of ignition. Seventy-three seconds into the flight, the external fuel tank breached, the vehicle broke apart, and seven crew members died. The interval between ignition and breakup — roughly ninety seconds if one includes the initial escape of gases through the failing seal — compressed into visible catastrophe the cumulative effect of five years of normalized deviance that no single decision had authorized and every decision had enabled.
In The You On AI Field Guide
The ninety seconds became, through Vaughan's subsequent decade of reconstruction, the