时间：2011-03-11 23:13来源：蓝天飞行翻译 作者：admin 点击：次
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five-minute rating (battery capacity rating). The ampere-hour rating of a battery when current is taken from it at such a high rate that the battery will be discharged in five minutes. The high current drawn from a battery causes the ampere-hour capacity to be much less at its five-minute rating than it is at its five-hour rating. The five-minute rating gives an indication of the way the battery will respond under the load placed on it by the engine starter. fix (aircraft navigation). A geographical position determined by visual references to the surface, by reference to one or more radio navaids, by celestial plotting, or by other navigational methods. fix balancing (air traffic control). A process whereby aircraft are evenly distributed over several available arrival fixes. Fix balancing reduces delays and controller workload. fixed fire-extinguishing system. A fire-extinguishing system installed in an aircraft. fixed landing gear (aircraft landing gear). A nonretractable landing gear. A fixed landing gear cannot be retracted into the aircraft structure to decrease the wind resistance. fixed-pitch propeller (aircraft propeller). A type of propeller used on aircraft when low cost and simplicity are more important than efficient performance. The blades of a fixed-pitch propeller are set at one pitch angle which cannot be changed. Up through World War II, most fixed-pitch propellers were made of laminated birch, but since that time, most have been made of forged aluminum alloy. The pitch angle of a fixed-pitch propeller is a compromise between that which allows the engine to turn fast enough to produce the maximum horsepower for takeoff, and that which moves the aircraft through the air a maximum distance for each revolution, giving the best fuel economy and speed. fixed-wing aircraft. An airplane or glider whose wing is rigidly attached to the structure. The term fixed-wing is used to distinguish these aircraft from rotary-wing aircraft, such as helicopters and autogiros. flag alarm (instrument warning device). A warning device incorporated in certain airborne navigation and flight instruments indicating that instruments are inoperative or otherwise not operating satisfactorily, or that signal strength or quality of the received signal falls below acceptable values. flameout (gas turbine engine operation). A condition in the operation of a gas turbine engine in which the fire in the engine unintentionally goes out. If too much fuel is sprayed into the combustors, the fire will go out, and this is called a rich flameout. If there is too little fuel, the fire will go out, and this is called a lean flameout. flameout pattern (air traffic control). An approach normally conducted by a single-engine military aircraft experiencing loss or anticipated loss of engine power or control. The standard overhead approach starts at a relatively high altitude over a runway (high key) followed by a continuous 180° turn to a high, wide position (low key), followed by a continuous 180° turn to final. The standard straight-in pattern starts at a point that results in a straight-in approach with a high rate of descent to the runway. |
