jackscrew
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Alternative forms
Etymology
Noun
jackscrew (plural jackscrews)
- A jack (mechanical lifting device) which is operated by turning a leadscrew.
- 2002 December 30, National Transportation Safety Board, “2.2.2.1 Cause of the Jam”, in Aircraft Accident Report: Loss of Control and Impact with Pacific Ocean, Alaska Airlines Flight 261, McDonnell Douglas MD-83, N963AS, About 2.7 Miles North of Anacapa Island, California, January 31, 2000, archived from the original on 16 June 2022, page 129:
- As previously mentioned, the horizontal stabilizer's jackscrew assembly includes an acme screw and nut, both of which have two threads. After the accident, severely worn and sheared remnants of the acme nut threads were recovered wrapped around the acme screw. The condition of the recovered acme nut thread remnants indicated that approximately 90 percent of the thread thickness had worn away before the remainder of the threads sheared off. In comparison, a jackscrew assembly with the maximum amount of wear permitted in service, as indicated by an end play measurement of 0.040 inch (that is, 0.030 to 0.037 inch of wear), would only have about 22 percent of the thread thickness worn away.
- A leadscrew; a screw used to translate rotational into linear motion.
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