| 21. | That plane's jackscrew assembly was replaced.
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| 22. | The airline, like other carriers, has focused on jackscrews since the crash.
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| 23. | The jackscrew assembly consists of a nut that rides up and down a screw.
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| 24. | This has resulted in much more frequent inspection and lubrication of the jackscrew assembly.
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| 25. | Boeing believes this is why grease was not getting to the jackscrew during lubrication.
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| 26. | Every plane in America's fleet had its original jackscrew, Guzzetti said.
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| 27. | American Airlines, 284 planes, one jackscrew lacked lubricant, it was lubricated.
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| 28. | Northwest Airlines, 172 planes, one with grit in grease, jackscrew replaced.
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| 29. | Mechanics had tested the jackscrew assembly seven times within a few days in 1997.
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| 30. | An FAA metallurgist said a tube that put grease on the jackscrew was clogged.
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