Instrument Flying: Technique in Weather Page: 20
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RESTRICTED
T. O. No. 30-100D-14
a
Glaze occurs most frequently in clouds of high density, that is, composed of numer-
ous large, water particles. Glaze also forms in freezing rain and freezing drizzle.When the air, before lifting, was initially quite cold
or dry, it could not contain much moisture and any
cloud which formed in it could produce only light icing.
At temperatures below -200C, the possibility of serious
icing is, therefore, small in any except cumulonimbus
clouds. Within cumulonimbus, however, the accumu-
lation of ice at a low temperature may be extremely
rapid. In this case, the windshield will rapidly be
20 REcoated with ice and the view through it obscured. The
appearance of the windshield should never be taken as
an indication of the thickness of ice on the plane. The
pilot should always judge the degree of icing by ob-
serving the formation on the airfoil surfaces.
In summer the freezing level will be, on the aver-
age, higher than in winter, so most icing will occurSTRICTED
Section 4
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ft4 t :n q, x sr r
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Army Air Forces. Instrument Flying: Technique in Weather, book, January 1, 1944; Ashland, Ohio. (https://texashistory.unt.edu/ark:/67531/metapth873973/m1/26/: accessed July 16, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu; crediting National WASP WWII Museum.