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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accelerate-stop distance (aircraft performance). The length of runway needed for an aircraft to accelerate to a specified speed, and then, in case of engine failure, be able to stop on the runway. accelerating agent. A component or substance used to hasten a chemical action or change. accelerating pump (carburetor component). A small pump in a carburetor used to produce a momentarily rich fuel-air mixture to the engine when the throttle is suddenly opened. The fuel supplied by the accelerating pump prevents the hesitation that would otherwise occur between the time the engine stops operating on the idle metering system and the time there is enough air flowing through the carburetor for it to supply fuel through the main metering system. acceleration. The amount the velocity of an object, measured in feet per second, is increased by a force during each second it is acted upon by that force. Acceleration is normally expressed in terms of feet per second, per second (fps2). acceleration caused by gravity. The acceleration of a freely falling body caused by the pull of gravity. Acceleration caused by gravity is expressed as the rate of increase of velocity over a given unit of time. This rate, in a vacuum, near sea level at a location of 40° north latitude is 32.2 feet, or 9.8 meters, per second, per second. This acceleration decreases with an increase in altitude until it becomes zero outside of the earth’s gravitational field. acceleration check (gas turbine engine maintenance check). A maintenance check of a gas turbine engine in which the time required for the engine to accelerate from idle RPM to its rated-power RPM is compared with the time specified for this acceleration by the engine manufacturer. acceleration control unit. See ACU. acceleration error (magnetic compass error). An error in the indication of a magnetic compass that shows up when the aircraft accelerates or decelerates while flying on an easterly or westerly heading. The float in an aircraft magnetic compass is unbalanced to compensate for the downward pull of the vertical component of the earth’s magnetic field (dip error), and the inertia caused by a change in speed acts on this unbalanced condition. When the aircraft accelerates on an easterly or westerly heading, the compass indicates that the aircraft is turning to the north, and when it decelerates on either of these headings, the compass indicates that the aircraft is turning to the south. acceleration switch. A switch in a piece of airborne electronic equipment actuated by an abnormal acceleration. Emergency Locator Transmitters (ELTs) have an acceleration switch that causes them to begin transmitting if the aircraft crashes and subjects the ELT to an abnormally high longitudinal acceleration. Acceleration switches are also called inertia switches. acceleration well (carburetor component). An enlarged annulus around the discharge nozzle of some float-type carburetors. The acceleration well fills with fuel when the engine is idling, and when the throttle is suddenly opened, this additional fuel discharges into the engine through the main discharge nozzle. |
