航空術(shù)語(yǔ)詞典Dictionary of Aeronautical Terms 下

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

nonlinear system. A system whose output does not change in the same proportion as the input. If the output voltage of a system changes as the square of the input voltage, the system is nonlinear.
nonmagnetic material. Any material that cannot be magnetized nor is attracted to a magnet. Wood, paper, and most plastics are nonmagnetic, and aluminum, brass, and most nonferrous metals are nonmagnetic.
nonmovement area (air traffic control). Taxiways and apron (ramp) areas not under the control of air traffic.
nonporous. The state of a material having no pores or openings through which liquids or gases can seep. Glass is an example of a nonporous material.
nonprecision approach procedure. 14 CFR Part 1: “A standard instrument approach procedure in which no electronic glide slope is provided.”
nonrepairable damage. Damage to an aircraft or component that cannot be repaired. This type of damage requires the part to be replaced.
nonrigid airship. A form of steerable lighter-than-air aircraft that uses the pressure of the gas to maintain the shape of the envelope. A blimp is an example of a nonrigid airship.
nonscheduled airline. An airline that carries passengers or cargo for hire, but does not operate according to a regular or published schedule.
nonservo brakes (aircraft brakes). Brakes that do not use the weight of the aircraft to increase the friction. Disk brakes and expander tube brakes are examples of nonservo brakes.
nonskid brakes. Aircraft power brakes that do not lock up and allow a tire to skid. Wheels equipped with nonskid brakes have a wheel-speed sensor in their hub that measures the rate at which the wheel decelerates (slows its rotation). If the wheel decelerates at a rate that shows a skid is beginning, the nonskid valve between the power brake control valve and the wheel cylinder is signaled to release the hydraulic pressure to the brake until the wheel begins to speed up. Then the valve automatically reapplies the pressure.
A wheel equipped with a nonskid brake is held on the edge of a skid, but a skid is not allowed to develop. Nonskid brakes are also called antiskid brakes.
nonspecular. Nonreflecting. Nonspecular lacquer is used to finish the deck of an aircraft fuselage ahead of the cockpit so light reflections will not impair the pilot’s vision.
nontautening dope. Aircraft dope that causes almost no shrinkage of the fabric on which it is applied. Nontautening dope is used on polyester fabric after it has been shrunk with heat.
nonvolatile memory (digital computer memory). Memory in which the stored data is not lost when power to the computer is turned off. ROM (Read Only Memory) is nonvolatile, while RAM (Random Access Memory) is volatile.
NOR gate (logic gate). A NOT OR logic gate that has two or more inputs and one output. The output is logic zero (NOT one) when the signal on any one of the inputs is logic one. The symbol for a NOR gate is the symbol for an OR gate, followed by a small circle, to show that the output of the gate is inverted. (Its logic condition is changed.)

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