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航空術(shù)語(yǔ)詞典 Dictionary of Aeronautical Terms 上

時(shí)間：2011-03-11 23:11來(lái)源：藍(lán)天飛行翻譯 作者：admin 點(diǎn)擊：次


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.
cheesecloth. A lightweight cotton gauze which has no sizing in it. Sizing is a substance, such as starch, used to make a cloth stiff.
Cheesecloth is used as a straining element to remove lumps and contaminants from liquids.
chemical compound. A combination of two or more atoms of chemical elements which have joined together to form molecules. A compound is different from a mixture in that the elements in a compound unite in specific amounts to form a substance different from any of the original elements. In a mixture, the elements keep their identity.
When two atoms of hydrogen join one atom of oxygen by sharing some of their electrons, the chemical compound water (H2O) is formed.

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.
chemical energy. Energy that exists in a chemical element or in a chemical compound. This energy may be released when the element or compound joins (reacts with) other chemicals to produce new compounds.
For example, when gasoline (C8H18) burns, it reacts with oxygen (O2) in the air and forms carbon dioxide (CO2) and water (H2O). It also releases a large amount of energy in the form of light and heat.

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