Page 325 - PPL-engelsk 2025
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Meteorology
The figure below shows at which temperatures the risk of icing is greatest.
At the top there is no danger of
icing – the crystals are solid and
slide off the plane.
o
o
Between -40 and -15 there is
less risk of icing.
Between the freezing point and -
o
15 there is a high incidence of
supercooled droplets and thus a
high risk of icing.
If you start to get ice formations:
seek an altitude with positive temperatures, or land!!
Catastrophic ice formations can happen in less than 5 minutes!!!
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3.9.3 Carburetor icing
Another problem is carburetor icing. It has no connection to the icing
mentioned previously.
Carburetor icing occurs, even in clear air, due to the temperature drop in the
carburetor during the evaporation of gasoline and the pressure drop in the
venturi.
Carburetor icing can form at temperatures up to +27°C, but most often
between +10°C and +15°C.
By properly operating the carburetor heating, these problems can be solved.
Flight Theory PPL(A)(UL)/LAPL Henning Andersen, Midtjysk Flyveskole© 2025 325
