The disadvantage to this type of screw is that it is not self-locking. Ball screws are prevalent in powered leadscrew actuators. Jackscrews are also used extensively in aviation to raise and lower horizontal stabilizers.
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The failure of a jackscrew on a Yakovlev Yak airliner due to design flaws resulted in the crash of Aeroflot Flight in The destruction of a jackscrew on a Boeing F , brought down National Airlines Flight in This flight had just departed Bagram Airfield when a MRAP armoured vehicle broke loose and slid through the rear bulkhead, severing hydraulics lines and most importantly, destroying the jackscrew, rendering the aircraft uncontrollable. The term jackscrew is also used for the captive screws that draw the two parts of D-subminiature electrical connectors together and hold them mated.
When unscrewed, they allow the connector halves to be taken apart. These small jackscrews may have ordinary screw heads or extended heads also making them thumbscrews that allow the user's fingers to turn the jackscrew. Furthermore, the head sometimes has an internal female thread, with the male externally threaded screw shaft extending from that. The threaded-head type can be used to panel-mount one connector and provide a means to attach the mating connector to the first connector.
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The jackscrew figured prominently in the classic novel Robinson Crusoe. A farmer's jackscrew secured the damage until landfall. From Wikipedia, the free encyclopedia.
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