Icing Page: 9 of 22
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FRAME 2 (Continued)
RIME ICE FORMATION:--Shape: Sharp, pointed.
only slight "burbling" of air over rotor blades
FROST is composed of ice crystals and is formed by sublimation when water vapor contacts
a cold surface. On the ground, it may form on your aircraft during a clear night on subfreezing
surfaces. Frost may also form in flight during a descent into warmer moist air - or when the
aircraft passes from a sub-freezing air mass into a slightly warmer moist air mass at the same
Clear ice is encountered in cumuliform clouds where the temperature is between
a. 0 degrees F and -10 degrees F.
b. -10 degrees C and -20 degrees C.
c. -10 degrees F and -20 degrees F.
0 degrees C and -10 degrees C.
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Snyder, Henry W. Icing, pamphlet, February 1971; Texas. (texashistory.unt.edu/ark:/67531/metapth46570/m1/9/: accessed August 20, 2017), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; crediting Boyce Ditto Public Library.