Episode
Normalization of Deviance: The Challenger Disaster and How Shop Standards Drift [E236]
- Published
- May 13, 2026
- Duration seconds
- 1677
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Summary
Thanks to our Partners, Pico Technology, Autel, and Independent Wrench Jobs Watch Full Video Episode Matt Fanslow revisits the Challenger disaster, not just as a historical tragedy, but as a case study in how standards, tolerances, and risk perception can shift over time. The common simplified story is that management ignored engineers, pushed the launch forward, and disaster followed. While that is part of the story, Matt looks at the deeper concept sociologist Diane Vaughan identified: normalization of deviance . The Challenger disaster happened 73 seconds after launch in 1986, killing all seven astronauts onboard. The failure was traced to O-rings in the solid rocket boosters that lost sealing ability in unusually cold conditions. But the broader lesson is not simply that one part failed. It is that warning signs had appeared before, yet each successful mission expanded the boundary of what NASA considered acceptable. What would have once been treated as outside tolerance gradually became normal. Matt connects this idea to the phrase, “slowly, then all at once,” often used to describe the collapse of relationships, marriages, systems, and businesses. The visible failure may seem sudden, but the conditions that made it possible usually developed over a long period of tolerated drift. From there, the discussion moves into automotive repair. Shops can experience the same pattern with ADAS calibrations, wheel torque procedures, tire repairs, safety glasses, uniforms, training expectations, and other operating standards. A procedure gets missed once. Nothing bad happens. It gets missed again. Still nothing bad happens. Eventually, the shop no longer treats the original standard as the standard at all. The absence of immediate consequences becomes false evidence that the…