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By Equipping Their DC-10s with Three Independent Hydraulic Circuits so that No Failure Could Cut Them All, the Americans Literally Left One Engine Debris to Cut Them Together over the Iowa

Summary by SciencePost
Over the Iowa, on July 19, 1989, a United Airlines DC-10 instantly lost all its control systems when a failure to manufacture the rear engine caused an explosion that cut off the three independent hydraulic circuits. For 46 minutes, the crew had only one lever: the differential power of the engines. A passenger instructor and exceptional pilots would turn this disaster into a quasi-miracle. More
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Over the Iowa, on July 19, 1989, a United Airlines DC-10 instantly lost all its control systems when a failure to manufacture the rear engine caused an explosion that cut off the three independent hydraulic circuits. For 46 minutes, the crew had only one lever: the differential power of the engines. A passenger instructor and exceptional pilots would turn this disaster into a quasi-miracle. More

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SciencePost broke the news on Tuesday, September 8, 2026.
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