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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asymmetrical loading (propeller thrust). The loading of a propeller disk in such a way that one side produces more thrust than the other side. asymptote (mathematics). A curve that comes nearer and nearer to a given line without ever touching it. asynchronous (electronic circuit operation). Operations at a speed determined by circuit functions and not by any timing device. ATA 100 (Air Transport Association Specification No. 100). The standardized format for aircraft maintenance manuals developed by the Airline Transport Association. This classification of aircraft systems and components allows standardization of maintenance information. ATC (air traffic control). See air traffic control. ATC (Approved Type Certificate). A certificate of approval issued by the Federal Aviation Administration for the design of an airplane, engine, or propeller. An ATC certifies that the product meets at least the minimum design standards. “ATC advises” (air traffic control). A phrase used to prefix a message of noncontrol information when it is relayed to an aircraft by other than an air traffic controller. ATC assigned airspace. Airspace defined by vertical and lateral limits assigned by ATC for the purpose of providing air traffic segregation between specified activities being conducted within the assigned airspace. ATCCC (air traffic control command center). An air traffic service facility that consists of four operational units: Central flow control function (CFCF). Responsible for coordination and approval of all major intercenter flow control restrictions. Central altitude reservation function (CARF). Responsible for coordinating, planning, and approving special user requirements under the altitude reservation concept. Airport reservation office (ARO). Responsible for approving IFR flights at designated high-density traffic airports. ATC contingency command post. A facility which enables the FAA to manage the ATC system when significant portions of the system’s capabilities have been lost or threatened. “ATC clears” (air traffic control). A phrase used to prefix an ATC clearance when it is relayed to an aircraft by other than an air traffic controller. ATC instructions (air traffic control). Directives issued by air traffic control for the purpose of requiring a pilot to take specific actions. Typical instructions are “turn left heading two five zero,” “go around,” and “clear the runway.” “ATC requests” (air traffic control). A phrase used to prefix an ATC request when it is relayed to an aircraft by other than an air traffic controller. ATCSCC (air traffic control system command center). See ATCCC. ATF (aerodynamic twisting force). The aerodynamic force that acts on a rotating propeller blade to increase its blade angle. The axis of rotation of a blade is near the center of its chord line, and the center of pressure is between the axis and the leading edge. Aerodynamic lift acting through the center of pressure tries to rotate the blade to a higher pitch angle. |
