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

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


antilogarithm. The number from which a logarithm is derived. The symbol for antilogrithm is log-1.
antimissile missile. A missile launched from the surface or from an aircraft to locate and destroy another missile.
antimony. A hard, brittle, lustrous, silvery-white metallic chemical element. Antimony’s symbol is Sb, its atomic number is 51, and its atomic weight is 121.75. Antimony expands as it changes from its molten state into a solid state, and because of this, it is an important alloying element with lead for type metal and for making lead-acid storage batteries.
antipropeller end (aircraft engine). The end of an aircraft engine opposite the end to which the propeller is attached. Front or back is not always a good way to identify the ends of an aircraft engine, because the engine may be used with the propeller either in front or in back. To identify the ends of an engine correctly, the terms propeller end and antipropeller end are used. The antipropeller end is often called the accessory end.
antiseize compound. A lubricant used on threads to prevent their locking together. Antiseize compound is specially needed on spark plugs in reciprocating engines and on threaded fasteners in the hot section of gas turbine engines.
antiservo tab. A tab installed on the trailing edge of a stabilator. The tab automatically moves in the same direction as the stabilator to produce a stabilizing aerodynamic force that tries to bring the surface back to a streamline position. An antiservo tab is also called an antibalance tab.

antiskid brake system. An electrohydraulic control in an airplane’s power brake system that prevents the wheels skidding on wet or icy runways.
A wheel-speed sensor monitors the deceleration rate of every main landing gear wheel. If any wheel decelerates too rapidly, indicating an impending skid, pressure to that brake is released and the wheel stops decelerating. Pressure is then reapplied at a slightly lower value.
antitear strips. Strips of aircraft fabric laid under the reinforcing tape before the fabric is stitched to an aircraft wing.
antitorque pedals (helicopter controls). Foot pedals used by the pilot to control the pitch of the antitorque rotor on the tail of a single-rotor helicopter.
Controlling the pitch of the antitorque rotor allows the pilot to rotate the helicopter about its
vertical axis.
anvil. A hard-faced block used as a surface on which parts may be hammered or shaped.
anvil cloud (meteorology). The popular term given to the top portion of a cumulonimbus cloud because of its anvil shape.
aperiodic compass. A form of aircraft magnetic compass that has damping vanes on the float. These vanes keep the compass from oscillating when flying in rough air or when the aircraft is turned to a new heading.
aperiodic damping. Damping which prevents an object overswinging, or moving past its at-rest position. If a pendulum does not have aperiodic damping, when it is disturbed from its at-rest position, it will move back toward this position but will overshoot and oscillate back and forth, with each oscillation smaller than the swing before it.

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