航空術(shù)語詞典Dictionary of Aeronautical Terms 下

時(shí)間：2011-03-11 23:18來源：藍(lán)天飛行翻譯 作者：航空 點(diǎn)擊：次

nose gear (aircraft landing gear). The wheel under the forward end of the fuselage of an aircraft equipped with a tricycle landing gear.
nose-gear centering cam. A cam in the shock strut that causes the wheel of a retractable nose gear to straighten fore-and-aft when the strut is fully extended. When the aircraft takes off and the strut extends, the wheel straightens so it can be retracted into the wheel well.
nose rib (airplane wing component). A partial wing rib that extends back only to the front spar. Nose ribs, also called false ribs, are installed between each full rib to support the leading edge and give the wing its correct aerodynamic shape.
nose section (aircraft reciprocating engine component). The forward section of an aircraft reciprocating engine crankcase that contains the thrust bearing and propeller reduction gears.
NOTAM (Notice to Airmen). A notice containing information (not known sufficiently in advance to publicize by other means) concerning the establishment, condition, or change in any component (facility, service, or procedure of, or hazard in the National Airspace System), the timely knowledge of which is essential to personnel concerned with flight operations.
notch sensitivity. A measure of the loss of strength of a material caused by the presence of a notch, or V-shaped cut.
NOT gate (logic gate). A NOT gate is an inverter. A NOT gate has one input and one output, and the logic condition at the output is always opposite the logic condition at the input. The symbol for a NOT gate is a triangle (the symbol for a buffer), followed by a small circle to show that the output is inverted. See inverter.

Notice to Airmen. See NOTAM.
Notice to Airmen Publication. See NTAP.

no transgression zone. See NTZ.
NOZ (normal operating zone) (air traffic control). The operating zone within which aircraft flight remains during normal independent simultaneous parallel ILS approaches.
nozzle. A tapered end of a duct through which fluid flows. The area of a converging nozzle decreases in the direction the fluid is flowing, and when fluid flows through a converging nozzle at a subsonic speed, it speeds up. The area of a diverging nozzle increases in the direction the fluid is flowing, and when fluid flows through a diverging nozzle at a subsonic speed, it slows down.
nozzle diaphragm (gas turbine engine component). The ring of stationary vanes directly ahead of the turbine wheel. The vanes in the nozzle diaphragm form a series of convergent ducts which accelerate the air as it leaves the combustors and direct it into the turbine blades at the angle that gives the turbine its maximum efficiency.
The nozzle diaphragm is also called the turbine inlet guide vanes. See turbine inlet guide vanes.
nozzle guide vanes. See turbine inlet guide vanes.
NPN transistor. A bipolar transistor made of three pieces of semiconductor material (silicon or germanium) joined together. The emitter and collector are made of N-type material, and the base, which is sandwiched between them, is made of P-type material.

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