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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load bank (electrical component). A heavy-duty electrical resistor, used to dissipate large amounts of electrical energy. Load banks are used to discharge storage batteries for servicing them and to dissipate large amounts of current when loading a generator as is done with a reciprocating engine dynamometer. load cell (electronic weighing system component). A component in an electronic weighing system that contains strain gages. When an aircraft is weighed, the load cells are placed between the jacks and the jack pads on the aircraft, and the aircraft is raised by the jacks. The weight of the aircraft compresses the load cells, and the compression changes the resistance of the strain gages. The change in this resistance is converted into units of weight the load cell is supporting. load factor (aircraft structure). The ratio of the amount of load imposed on an aircraft structure to the weight of the structure itself. Load factors imposed on an aircraft in flight are measured by accelerometers and are expressed in terms of G-units (gravity units). 14 CFR Part 1: “The ratio of a specified load to the total weight of the aircraft. The specified load is expressed in terms of any of the following: aerodynamic forces, inertia forces, or ground or water reactions.” load matching network (electrical circuit). An electrical circuit used to match the input impedance of an electrical load to the output impedance of a power circuit, such as an amplifier. loadmeter (electrical instrument). A type of ammeter installed between the generator output and the main bus in an aircraft electrical system. Loadmeters are calibrated in percentage of the generator’s rated output, rather than in amperes. local airport advisory (air traffic control). A service provided by flight service stations or the military at airports not serviced by an operating control tower. This service consists of providing information to arriving and departing aircraft concerning wind direction and speed, favored runway, altimeter setting, pertinent known traffic, pertinent known field conditions, airport taxi routes and traffic patterns, and authorized instrument approach procedures. This information is advisory in nature and does not constitute an ATC clearance. localizer (instrument landing system). The portion of an instrument landing system (ILS) that directs the pilot of an aircraft down the center line of the instrument runway for the final approach in an instrument landing. The localizer transmits two signals, one modulated with a 90-hertz tone, and the other with a 150-hertz tone. These two signals are transmitted from highly directional antennas so they overlap along the center line of the runway by two and a half degrees. The vertical needle of the cross-pointer indicator in the aircraft responds to these two signals. When the aircraft is flying along a path lined up with the center line of the runway, the needle is centered. When the aircraft moves to one side of the center line or the other, the signal for the side it is on is the stronger, and the needle swings over to show the side of the runway over which the airplane is flying. |
