时间：2011-03-11 23:18来源：蓝天飞行翻译 作者：航空 点击：次
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snap roll (airplane maneuver). An abrupt maneuver of an airplane in which the airplane does a single turn of a spin while flying in a horizontal direction. snips (metal-working hand tool). Hand-operated shears used for cutting sheet metal. The most generally used snips are called tin snips, because they are commonly used to cut commercial sheet metal which is often (though incorrectly) called “tin.” snow (type of precipitation). A type of precipitation that forms in the air when water vapor changes directly into crystals of ice. Snow forms when the air temperature is below 0°C. snow flurry (meteorology). A popular term for snow shower, particularly of very light and brief nature. snow grains (meteorology). Precipitation of very small, white, opaque grains of ice, similar in structure to snow crystals. The grains are fairly flat or elongated with diameters generally less than 0.04 inch (1 mm). snow pellets (meteorology). Precipitation consisting of white, opaque ice particles that are approximately round or sometimes conical. The particles have a snow-like structure and are about 0.08 to 0.2 inch in diameter. Snow pellets differ from snow grains in that they are crisp and easily crushed, and they rebound from a hard surface and often break up. snubber (fluid power system component). A component in a hydraulic or pneumatic actuator that slows the motion of the actuator piston. The snubber absorbs the shock when the actuator piston reaches the end of its travel. snubber (instrument component). A restrictor fitting installed between an oil pressure gage and the pressure pump. A snubber prevents the indicator pointer from fluctuating. soak (metal heat treatment). The procedure in which metal being heat-treated is held in an oven at an elevated temperature until it is heated uniformly throughout. soap. A material used for cleaning or as an emulsifier. Soap is made by the chemical action between the salt of a metal, such as sodium or potassium, and a fatty oil. Soap assists water in penetrating a film of grease or dirt on a surface so it can be washed away. SOAP (Spectrometric Oil Analysis Program). An oil analysis program in which a sample of oil is burned in an electric arc and an examination is made of the wavelength composition of the resulting light. Each chemical element in the oil, when burned, produces light containing a unique band of frequencies. A computer analyzes the amount of each band of frequencies and prints out the number of parts of the element per million parts of the entire sample. SOAP can predict engine problems by warning the engine operator of an uncharacteristic increase in the amount of any of the elements in the oil. soap bubble test. A type of test used to check for leaks in almost any kind of system in which a gas is held under pressure. A soap solution is brushed over all areas of a pressurized system where a leak could occur, and if there is a leak, the escaping gas will form bubbles in the soap film. |
