Icing Page: 12 of 22
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ANSWER: b. Light icing.
WHERE ICE FORMS
There are several critical places on an aircraft where ice may form that will affect its flying
performance or even render it unfit for flight.
a. It may form within or on the pitot tube, which will cause your airspeed indicator to give
b. It may form in the carburetor, causing loss of power or even stopping the engine
c. It may cover the windshield to such an extent that you may have to break out the glass
in order to land safely, if your de-icing equipment fails to clear it.
d. It may form on the main rotor head assembly and interfere with collective pitch and
e. It may form on the main rotor blades. Several factors tend to reduce ice accretions on
the main rotor blades. At a hover a 3/16 inch coating of ice is sufficient to prevent some
helicopters from maintaining flight. The uneven accretion or shedding of this ice formation may
also produce severe rotor vibration.
f. It may form on the tail rotor which produces the same hazards as those associated with
the main rotor, but the vibration will be of a high frequency nature.
g. It may form on the engine and transmission air intake screens which results in
inadequate cooling of the engine and transmission.
Which one of the following statements is correct?
a. Ice formation in the pitot tube will cause the manifold pressure to decrease.
b. The formation of ice on the tail rotor will cause a low frequency vibration.
c. The formation of ice on the main rotor blades will have no effect on the aircraft flying ability.
0 Ice formation on the main rotor head could possibly interfere with the collective pitch and cyclic
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Snyder, Henry W. Icing, pamphlet, February 1971; Texas. (texashistory.unt.edu/ark:/67531/metapth46570/m1/12/: accessed July 25, 2017), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; crediting Boyce Ditto Public Library.