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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breakers (tire component). Layers of reinforcing fabric (cords) in an aircraft tire between the casing plies and the tread rubber. Breakers protect the casing plies and strengthen the tire. breakout (air traffic control). A technique used to direct aircraft out of the approach stream. In the context of close parallel operations, a breakout is used to direct threatened aircraft away from a deviating aircraft. breast drill. A hand-held drill motor used to drill relatively large holes in wood or metal. The handle of the drill motor is fitted with a curved plate that allows the user to apply a pushing force with his upper body as the drill cuts the hole. breather (engine lubricating system). A vent line in an aircraft engine that allows the air pressure inside the engine crankcase to be the same as the pressure of the surrounding air. An effective breather system prevents pressure building up inside the engine and forcing oil out of the crankcase. breather-pressurizing valve (turbine engine lubrication system component). An aneroid-operated valve in the overboard vent line of the lubrication system of some turbine engines. The breather-pressurizing valve is open at sea level, but closes with increasing altitude to maintain sea level pressure inside the vent system as the aircraft goes up in altitude. breech chamber (cartridge-pneumatic starter). A locking chamber in a cartridge starter that holds a pyrotechnic cartridge (a powder charge). The cartridge is placed in the breech, the breech is closed and locked, and the cartridge is fired. The expanding gases produced by the burning powder spin the turbine in the starter. breeder reactor (nuclear energy). A reactor that produces fissionable material as well as consuming it. bridge circuit (electrical circuit). An electrical circuit containing four impedances connected in such a way that their schematic diagram forms a square. One pair of diagonally opposite corners is connected to an input device, and the other two corners are connected to the output device. See illustration for balanced bridge. bridge-type rectifier. An electrical rectifier circuit using four diodes to change alternating current into full-wave rectified direct current. bright band (radar meteorology). A narrow, intense echo on the range-height indicator scope resulting from water-covered ice particles of high reflectivity at the melting level. |
