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Jan. 01/2007
Effectivity: 912 Serie
OM Edition 1 / Rev. 0
BRP-Rotax
— Preheat engine using hot air.
Beyond that observe following advices for operation at extremely low
temperatures:
◆ NOTE: Distinguish between two kinds of carb icing:
1) Icing due to water in fuel
2) Icing because of high air humidity
Addendum to note 1)
Water in fuel will accumulate at the lower parts of the fuel system and
leads to freezing of fuel lines, filters or jets.
Remedy:
— Use non-contaminated fuel (filtered through suède)
— Generously sized water separators
— Fuel lines routing inclined
— Prevent condensation of humidity, i.e. avoid temperature differ-
ences between aircraft and fuel.
▲ WARNING: Fuels containing alcohol always carry a small
amount of water in solution. In case of temperature
changes or increase of alcohol content, water or a
mixture of alcohol and water may settle and could
cause troubles.
Addendum to note 2)
Carburetor icing due to humidity may occur on the venturi and on the
throttle valve due to fuel evaporation and leads to performance loss
and change in mixture. Intake air pre-heating is the only effective
remedy.
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