時間：2011-03-11 23:11來源：藍天飛行翻譯 作者：admin 點擊：次
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angular acceleration. The rate at which a rotating object increases its rotational speed. angular measurement. Units of measurement used to specify the difference in direction of two lines that radiate from a common point. Three units of angular measurements are commonly used: The degree, the radian, and the grad: One degree is the amount of separation between two lines that is equal to 1/360 of a circle. One radian is the amount of separation between two lines that is equal to 360° ÷ 2π, or 57.3°. One grad is the amount of separation between two lines that is equal to 1/400 of a circle, or 1/100 of a right angle. angular momentum. The momentum possessed by a body because of its rotation. angular velocity. The rate of change of angle as a shaft rotates. Angular velocity is measured in degrees per second, or in radians per second. AN hardware. Standard hardware items such as bolts, nuts, screws, and rivets made according to standards established by the Air Force and Navy. AN hardware is approved for use in both military and civilian aircraft. anhydrous. A material that contains no water. anion. A negative ion that moves toward the anode (the positive electrode) in the process of electrolysis. anneal. To soften a plastic or metal by means of heat treatment. annealed wire. Wire that has been softened by heat after its diameter has been decreased by drawing it through dies. Annealed copper wire is used as electrical hookup wire. annealing (metal heat treatment). A method of heat treatment in which a metal is softened so it loses some of its hardness and brittleness. Steel is annealed by heating it to a specified temperature and allowing it to cool very slowly, in an oven. Copper is annealed by heating it red-hot and quenching it in water. annual inspection (aircraft inspection). A complete inspection of the airframe and powerplant required for FAA-certificated aircraft operating under 14 CFR Part 91 (General Operating and Flight Rules) that are not on one of the authorized special inspection programs. An annual inspection must be conducted every 12 calendar months by an Aviation Maintenance Technician who holds an Aircraft rating with an Inspection Authorization. The scope of an annual inspection is the same as that of a 100-hour inspection. annual rings. The rings that appear in the end of a log cut from a tree. The number of annual rings per inch gives an indication of the strength of the wood. The more rings there are and the closer they are together, the stronger the wood. The alternate light and dark rings are caused by the difference in the growth rate of the tree. A tree grows fast in the spring and summer, producing the light-colored, less dense rings. The slower growth during the fall and winter produces the dark-colored, denser rings. annular combustor (gas turbine engine component). A single-piece combustor for a gas turbine engine made in the shape of a ring or a cylinder. Fuel is sprayed from nozzles mounted around a fuel manifold into the inner liner of the combustor. There, it is mixed with air from the compressor and burned. |
