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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deadhead. A return trip made by a commercial aircraft in which no cargo or persons are carried for hire. dead reckoning navigation (aircraft navigation). A method of navigating an aircraft in which the direction and speed of movement of the aircraft are determined by graphically computing the effect of the wind on the aircraft. A flight computer is used to plot the true airspeed and true heading against the wind direction and velocity to find the true course, or track, and the ground speed of the aircraft. dead room (acoustic testing). A room or chamber used to test acoustic devices. The floor, walls, and ceiling of the dead room are treated in such a way that they prevent the reflection of sound energy. Dead rooms are also called anechoic rooms or anechoic chambers. dead short (electrical circuit condition). A short circuit in an electrical device in which there is an absolute minimum of resistance across the source of electrical energy. dead-stick landing (aircraft maneuver). A landing made by an aircraft when the engine is producing no power. dead-weight tester (instrument calibration equipment). A device used to produce an accurate amount of pressure to calibrate pressure-measuring instruments. Oil pressure built up in the tester is applied to a cylinder fitted with a free-floating piston. This piston has an accurately known area and is loaded with an accurately known weight. The amount of pressure needed to raise the piston is found by dividing the weight being lifted by the area of the piston. This pressure is applied to the gage being calibrated, and the gage is adjusted to read this amount. deaerator chamber (gas turbine engine lubrication system component). A chamber in the lubrication system of a gas turbine engine in which the return oil from the engine collects before it is returned to the reservoir. Any air in the oil is allowed to escape while the oil is in this chamber. debooster (aircraft brake component). A component in a power brake system between the power brake control valve and the wheel cylinder. The debooster lowers the pressure of the fluid going to the brake and increases its volume, allowing the brakes to be applied more smoothly and released more quickly than they could be if system pressure went directly into the brakes. debugging. The process of troubleshooting a piece of electronic hardware or software to find any faults that would prevent the equipment operating as it should. |
