Instrument Flying: Technique in Weather Page: 26
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RESTRICTED
T. O. No. 30-100D-1is flying through clear air. Cloud particles, if pres-
ent, will contribute to the process, particularly if
their size and number is sufficient to result in a con-
tinuous deposit.
Carburetor ice is readily prevented by the appli-
cation of carburetor heat before the conditions which
may produce ice are encountered. The heated air
keeps the temperature above freezing throughout the
induction system, thus preventing the ice from form-
ing or melting that already formed.
Carburetor ice will not usually form in flight
through snow. However, large snowflakes may be
partially melted upon first entering the induction sys-
tem, and later may be frozen on contact with the cold
walls of the adapter.
APPLY CARBURETOR HEAT
Application of carburetor heat in sufficient time26
to prevent carburetor ice is always advisable; but as
carburetor ice can form in clear air, judgment must
be used in watching the manifold pressure and in ap-
plying carburetor heat as soon as a drop in manifold
pressure is noted, in preference to running the engine
with carburetor heat on at all times. However, if
serious carburetor icing is expected in clouds or
precipitation, do not hesitate to use carburetor heat
as a preventive.
Remember that this heat is supplied by the engine
exhaust. When the engine has lost power because of
carburetor ice, it may be too late to melt the accumu-
lated ice in the carburetor or induction system. If
anilol is available, however, it may be used under
these circumstances and in certain types of engines
it will have the added advantage of increasing the fuel
octane number.RESTRICTED
I I
Section 4
9
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4
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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/m1/32/: accessed July 16, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu; crediting National WASP WWII Museum.