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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chattering (brake malfunction). A malfunctioning condition of aircraft brakes that produces heavy vibrations. Chattering is caused by a glazed surface on the disk that alternately produces friction and then allows the lining to slip over the disk. High-frequency chattering is called brake squeal. check (wood defect). Longitudinal cracks in a piece of wood, generally extending across the annual rings. check flight (aircraft maintenance procedure). A test flight of an aircraft conducted to find out if all the systems are functioning as they should. Check flights are normally conducted after an aircraft has been inspected or repaired. checklist. A systematic and sequential list of all operations that must be performed to properly accomplish a complex task. Checklists are used in preflight inspections as well as 100-hour and annual inspections of aircraft, to ensure that no required operation is overlooked. check nut. A thin nut that can be jammed down tightly against a plain nut on a bolt. The check nut keeps the plain nut from vibrating loose. checkpoint (navigation). A location that can be positively identified either visually or electronically. When an aircraft flies over a checkpoint, the pilot knows his exactly location. check valve (fluid power system component). A valve that allows fluid to flow through it in one direction, but prevents it flowing through in the opposite direction. See the illustration of ball check valve. cheek (reciprocating engine crankshaft). The offset portion of a crankshaft that forms the crankpin to which the connecting rod big end is attached. chemical element. One of the fundamental building blocks of which all matter is made. There are just a few more than 100 different chemical elements. Some elements exist in nature by themselves, and others exist only in chemical compounds. Oxygen, carbon, gold, silver, and hydrogen are examples of chemical elements. |
