historyWikipedia1986 · Cape Canaveral, Florida, USA

Cold O-rings doomed Challenger in 1986, and engineers' warnings had gone unheeded

the gist

On January 28, 1986, Space Shuttle Challenger broke apart 73 seconds after launch from Cape Canaveral, killing all seven crew members. The cause was the failure of O-ring seals in a joint of the right solid rocket booster, which had stiffened in record-low temperatures that morning. Hot gas burned through the joint and into the external fuel tank, and the stack was torn apart by aerodynamic forces. The crew compartment fell into the Atlantic at about 207 mph and was recovered from the ocean floor during a three-month search. The disaster was watched live in many American schools because schoolteacher Christa McAuliffe was on board. The Rogers Commission later found that NASA managers had ignored known flaws and engineers' cold-weather warnings.

so what

The disaster changed how NASA handled safety, reliability and decision-making, and it led to a 32-month pause in shuttle flights. Its lesson that organisational culture can override engineering evidence is still cited in safety-critical industries.

fun fact

The shuttle orbiter Challenger had no launch escape system, and Endeavour was built in 1987 to replace it.

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