Icing Page: 14 of 22
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ANSWER: J. collective pitch and cyclic control.
Although most modern Army aircraft have turbine engines, some of the older airplanes and
helicopters in the inventory are still 'recip powered'-meaning that they have reciprocating
engines, just like the engine in your car. For these particular aircraft, the possibility of
CARBURETOR ICING is another "ice" hazard that can and should be avoided.
Carburetor ice can cause anything from a power loss (usually at the most critical moment) to
a complete engine failure. As vaporized air and fuel pass through the carburetor, the temperature
drop may be as much as 40 degrees. If you add moisture to the air (in the form of high relative
humidity) this moisture can freeze, forming enough ice to restrict-or completely stop -the flow
of fuel and air to the engine.
In level flight, carburetor ice will cause loss of power and airspeed. You can tell when it is
happening by a gradual dropping off of manifold pressure. It will not cause rough engine
operation, for carburetor ice has the same effect as slowly closing the throttle.
Ice may form on the throttle valve, causing it to stick. If ice is suspected, move the throttle
occasionally to keep it from sticking. AIR
Apply carburetor heat whenever ice is expectedDONT
WAIT FOR IT TO FORM!!
c f ENGIN E vel fight
Which one of the following statements would best describe carburetor icing in level flight?
/ Carburetor ice can be detected by noting a slow decrease in manifold pressure.
b. Ice in the carburetor has no effect on the manifold pressure or airspeed, but will cause the throttle
valve to stick.
c. Carburetor ice will cause the airspeed to decrease and the manifold pressure to increase.
d. All of the above.
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Reference the current page of this Pamphlet.
Snyder, Henry W. Icing, pamphlet, February 1971; Texas. (texashistory.unt.edu/ark:/67531/metapth46570/m1/14/: accessed May 26, 2017), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; crediting Boyce Ditto Public Library.