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Where to look and what to expect when the forecast mentions ice
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1990
[PDF-2.38 MB]
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Description:Ice — a chilling thought when it is considered in relation to airplanes. Mysterious, too. At least, there is little understanding of the phenomenon. The National Weather Service forecasts ice all winter long, when actually it is present only a small percentage of the time that it is forecast. And the Federal Aviation Administration shewed its lack of understanding with a proposal that "known" ice be defined as any time the temperature is lower than +5°C and there is visible moisture present. The FAA also used accidents related to carburetor ice in drumming up numbers to justify a proposal to prohibit flight in such conditions without appropriate equipment. That proposal was withdrawn, but the image of an FAA that is confused about the nature of airframe ice remains.
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