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icing conditions
In aviation, icing conditions are those atmospheric conditions that can lead to the formation of water ice on the surfaces of an aircraft, or within the engine as carburetor icing. Inlet icing is another engine-related danger, often occurring in jet aircraft. These icing phenomena do not necessarily occur together. Many aircraft, especially general aviation aircraft, are not certified for flight into ''known icing''—icing conditions certain or likely to exist, based on pilot reports, observations, and forecasts.
==Definition of icing conditions==
Icing conditions exist when the air contains droplets of supercooled liquid water; icing conditions are characterized quantitatively by the average droplet size, the liquid water content and the air temperature. These parameters affect the extent and speed that characterize the formation of ice on an aircraft. Federal Aviation Regulations contain a definition of icing conditions〔(Federal Aviation Regulations, Part 25, Appendix C )〕 that some aircraft are certified to fly into. So-called SLD, or supercooled large droplet, conditions are those that exceed that specification and represent a particular hazard to aircraft.
Qualitatively, pilot reports indicate icing conditions in terms of their effect upon the aircraft, and will be dependent upon the capabilities of the aircraft. Different aircraft may report the same quantitative conditions as different levels of icing as a result.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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