时间：2011-03-11 23:13来源：蓝天飞行翻译 作者：admin 点击：次
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The term joystick has been changed to control stick or, more simply, to just “stick.” JP-4 (gas turbine engine fuel). A gas turbine engine fuel composed of approximately 65% gasoline and 35% distillates in the kerosine range. JP-4, the equivalent of commercial Jet-B fuel is a primary fuel for military jet aircraft. JP-8 (gas turbine engine fuel). A gas turbine engine fuel which is a form of highly refined kerosine. JP-8 is the NATO equivalent of Jet-A fuel. jumper (electrical circuit). A short wire used to temporarily connect two points in an electrical circuit. Jumpers are normally used to temporarily bypass a portion of a circuit for test purposes and for troubleshooting. jump seat. A removable seat that can be set up between, and slightly behind, the pilot’s and copilot’s seats in an airplane. A flight mechanic (flight engineer) or observer riding in the jump seat can watch the instruments and can operate some of the auxiliary controls. junction (thermocouple). The point in a thermocouple at which the dissimilar metals join. A thermocouple has two junctions: the hot, or measuring, junction, and the cold, or reference, junction. junction box (electrical equipment). A box in which electrical wires can be joined and the junction of the wires protected from damage. Junction boxes are normally made of metal or fiberglass-reinforced plastic. junction field effect transistor. See JFET. junction transistor. A semiconductor device made of three layers of doped silicon or germanium. In an NPN junction transistor, layers of N-material are used as the emitter and collector. Between the two layers of N material is a very thin layer of P-material, which acts as the base. Electrons flowing between the emitter and base control the electrons flowing between the emitter and collector. A PNP junction transistor is like an NPN transistor except that the base is made of N-material between an emitter and collector of P-material. See illustration for bipolar transistor. jury strut (airplane structure). A small strut that connects the center of the main wing struts of a strut-braced monoplane to the wing spar. A jury strut stiffens the main struts to prevent their vibrating. |
