时间：2011-03-11 23:11来源：蓝天飞行翻译 作者：admin 点击：次
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area navigation (electronic navigation). A form of aircraft electronic navigation, commonly called RNAV, in which VORTAC stations can be electronically moved to any convenient location. A station that has been “moved” is called a way point, and the flight path goes from one way point to the next. 14 CFR Part 1: “A method of navigation that permits aircraft operations on any desired course within the coverage of station-referenced navigation signals or within the limits of self-contained system capability.” area navigation high route. 14 CFR Part 1: “An area navigation route within the airspace extending upward from, and including, 18,000 feet MSL to flight level 450.” area navigation low route. 14 CFR Part 1: “An area navigation route within the airspace extending upward from 1,200 feet above the surface of the earth to, but not including, 18,000 feet MSL.” area-rule fuselage. The fuselage of a supersonic airplane built so the combined frontal area of the fuselage and the wing form a smooth curve from nose to tail. An airplane with an area-rule fuselage has the minimum transonic drag. argon. A colorless, odorless, inert, gaseous chemical element. Argon has an atomic number of 18 and an atomic weight of 39.998. The symbol for argon is Ar. Argon is commonly used to fill electric light bulbs and the envelopes of electron tubes. The argon takes the place of air, which contains oxygen, and by keeping oxygen away from the hot filaments in the bulbs and tubes, the filaments will not burn out, or oxidize. ARINC (Aeronautical Radio Incorporated). A corporation whose principal stockholders are the airlines. Its function is to operate certain communication links between airliners in flight and the airline ground facilities. ARINC also sets standards for communication equipment used by the airlines. arithmetic. The basic foundation of all the systems of mathematics. Operations in arithmetic are: addition, subtraction, multiplication, and division of both whole numbers and fractions. Arithmetic deals only with real numbers. See real number. arithmetic sum. The arithmetic sum of two or more numbers is the value obtained when the absolute values of the quantities are added. See absolute value. arm (lever). The distance on a lever between the fulcrum and the point of application of the force or the weight. arm (weight and balance). The horizontal distance in inches between a reference datum line and the center of gravity of an object. If the object is behind the datum, the arm is positive, and if it is ahead of the datum, the arm is negative. armature. The rotating element in an electric motor or generator. armature core (electrical machine). The assembly of soft iron laminations on which the coils of an armature are wound. armature gap (electrical machine). The space between the armature core and the field poles of an electric motor or generator. armature reaction. The distortion of the magnetic flux between the field poles in an electric generator or motor caused by the magnetic field produced by current flowing in the winding of the armature. |
