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航空術(shù)語詞典 Dictionary of Aeronautical Terms 上

時間：2011-03-11 23:11來源：藍(lán)天飛行翻譯 作者：admin 點(diǎn)擊：次

automatic gain control (electronic circuit). An electronic circuit within a radio receiver that keeps the output volume relatively constant, even though the strength of the signal picked up by the receiver changes.
automatic intake valve (reciprocating engine component). An intake valve that is opened by the low pressure created inside the cylinder as the piston moves down. There is no mechanical means of opening it.
automatic mixture control (aircraft fuel metering system component). See AMC.
automatic pilot. An automatic flight control device that controls an aircraft about one or more of its three axes.
The primary purpose of an autopilot is to relieve the pilot of the control of the aircraft during long periods of flight. Automatic pilots may be directed by the human pilot, or they may be coupled to a radio navigation signal.
automatic pilot controller. The component in an automatic pilot system that allows the human pilot to direct the aircraft to hold a specified heading and/or altitude or to couple to one or more of the navigation radios for cruise flight or for a landing approach. Other controls allow the pilot to command a turn, and to trim the aircraft about any of its three axes.
automatic-reset circuit breaker. A thermally actuated electrical circuit protection device installed in some electric motors that opens the power circuit when the motor overheats and automatically closes to restore the circuit when the motor cools down.
Automatic-reset circuit breakers are not approved for use in aircraft electrical systems.

automatic terminal information service. See ATIS.
automatic volume control (radio receiver circuit). A circuit in a radio receiver that keeps the volume relatively constant as the input signal strength varies.
automation (manufacturing process). A process in which various manufacturing steps are programmed so they can be performed automatically, without requiring any input from a human operator.
automaton. A robot that can be programmed to automatically follow a predetermined set of instructions.
autopilot. See automatic pilot.
auto rich (reciprocating engine fuel air mixture). A fuel-air mixture whose ratio is kept constant in the rich range by an automatic mixture control in the carburetor or fuel injection system.
autorotation (aircraft flight condition). The rotation of an aircraft about any of its three axes caused by an aerodynamic force. An aircraft in a spin rotates because of an autorotative force.
autorotation (helicopter operation). Descent of a helicopter without engine power applied to its rotor. An aerodynamic force causes the rotors to spin.
If the engine in a helicopter fails, the freewheeling unit between the engine and the rotor allows the rotor to free-wheel, or turn without engine power, and an aerodynamic force, called an autorotative force, turns the rotor.
A landing made in a helicopter without the use of engine power is called an autorotative landing.

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