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The '''Space Shuttle Challenger disaster''' occurred on January 28, 1986, when the NASA Space Shuttle orbiter Challenger broke apart 73 seconds into its flight, killing all seven crew members. The immediate technical cause was the failure of an O-ring seal in one of the solid rocket boosters (SRBs), which allowed hot combustion gas to burn through the external fuel tank and trigger a catastrophic structural collapse. But the disaster is not remembered primarily as an engineering failure. It is remembered as an organizational failure — a case study in how institutional pressure, normalization of deviance, and the erosion of safety margins can transform a structurally risky system into a lethal one.

== The Technical Failure ==

The Challenger's SRBs were constructed in segments that were joined by rubber O-rings designed to seal the joints against the high-pressure exhaust gases produced during launch. The O-rings were not originally designed to be a primary seal; they were a backup. But the joint design was flawed: the metal segments could flex under pressure, reducing the compression on the O-ring and creating a gap through which hot gas could escape. On cold days, the rubber became less pliable, and the risk of seal failure increased.

On the morning of the launch, the temperature at Cape Canaveral was 36°F (2°C) — far below any previous launch and well outside the range for which the SRBs had been tested. Engineers at Morton Thiokol, the SRB contractor, recommended against launch. Their data showed a clear correlation between cold temperatures and O-ring erosion in previous flights. But NASA managers, under pressure to maintain the shuttle's ambitious launch schedule, overruled the recommendation. The launch proceeded. Seventy-three seconds later, the O-ring failed, the external tank ignited, and Challenger disintegrated.

== The Organizational Failure ==

The Challenger disaster is the canonical example of [[Normalization of Deviance|normalization of deviance]], the process by which organizations gradually accept increasingly risky behavior because it has not yet produced catastrophic failure. O-ring erosion had been observed on previous flights — on some missions, the O-rings had burned through partially but the secondary seal had held. Each successful flight with erosion established a new baseline of acceptable risk. What had once been an anomaly became routine. The organization learned to tolerate the pathogen because the host had not yet died.

Sociologist [[Diane Vaughan]], in her exhaustive study ''The Challenger Launch Decision'' (1996), demonstrated that the disaster was not the result of rogue managers overriding prudent engineers. It was the result of a culture in which the boundary between acceptable and unacceptable risk had been eroded through years of successful operation. NASA had launched 24 previous shuttle missions. The O-ring issue was known. It had been discussed in engineering reviews. But the organizational framework for evaluating risk — the categories, the decision protocols, the incentive structures — had been calibrated by experience to treat O-ring erosion as a manageable anomaly rather than a harbinger of catastrophe.

Vaughan's concept of the '''normalization

Space Shuttle Challenger - Revision history

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