National Weather Service and TV / radio sleet and snowfall and their depths on the ground are measured in tenths of an inch, with actual rainfall in hundredths, and ice accretion in either fractions or decimals.
12.
"Economic considerations must not be allowed to overcome what has been learned about the ice accretion on this aircraft and its effects on performance in actual line operations and tests, " he said in a letter to Transportation Secretary Federico Pena.
13.
:That said, there are tests you can make with ice-cores cut in the antarctic that demonstrate year-on-year pollen grain deposition and ice accretion thicknesses that could be done and analysed fairly quickly . . . but still, it's not something that exactly easy.
14.
Preliminary research ( mainly performed in Canada and the United States ), revealed that under certain conditions these ice crystals may lead to ice accretion on aircraft heated surfaces ( heated engines and probes ), even though the temperature of the surface is positive when the phenomenon starts.
