时间:2011-03-11 23:11来源:蓝天飞行翻译 作者:admin 点击:次
A bug on the horizontal situation indicator can be used to direct the automatic pilot to turn to and hold the heading on which the bug is set. bug (malfunction). A commonly used term for anything that prevents a system or component functioning as it should. This term has gained much use in the field of computer programs in which some small error can keep the program from working. Most newly written programs must be debugged before they work as they should. bug light (aircraft maintenance tool). A handy tool for rough troubleshooting an aircraft electrical system. A bug light has a flashlight bulb and batteries to check for continuity in the aircraft wiring, and a bulb of the proper voltage to check for the presence of voltage in the part of the system being examined. build-up and vent valve (liquid oxygen system). A manually operated valve on a liquid-oxygen converter used to control the amount of pressure inside the converter. When the valve is in the build-up position, pressure inside the converter is allowed to build up to a preset value. When the valve is moved to the vent position, gaseous oxygen is vented into the atmosphere without building up pressure. bulb angle (aircraft structural material). An L-shaped metal extrusion having an enlarged, rounded edge that resembles a bulb on one of its legs. A bulb angle is used to provide stiffness to a structure, while keeping the weight to a minimum. bulb root (turbine blade attachment method). A rounded end on a turbine blade that mates with a rounded hole in the periphery of the turbine disk, or wheel. Bulb-root blades are loose when the wheel is cold to allow for different rates of expansion between the blades and the wheel, while holding the blade against the centrifugal loads. Other types of blade roots are the dovetail and the fir-tree. |