Rotax 582 UL series Operator's Manual page 41

Noise
Winter
Carburetor icing
Remedies
Effectivity: 582 UL
Edition 3 / Rev. 0
The air intake silencer kit will provide significant engine noise
reduction. Further noise reduction may be obtained by the use
of an after-muffler kit. Be aware that modifications will require a
different carburetor setting.
Enquire at your dealer for more information, and consult author-
ized ROTAX® aircraft engines distributor or their independent
Service Center.
Winter can create additional problems such as carburetor icing,
frozen fuel lines, higher air densities etc., which may affect car-
buretor calibration and require longer warm-up periods.
Distinguish between two kinds of carburetor icing.
• Icing due to water in fuel
Water in fuel will accumulate at the lower parts of the fuel sys-
tem and leads to freezing of fuel lines, filters or jets.
• Icing because of high air humidity
Carb icing due to humidity may occur on the fuel exit and on the
carb piston and lead to performance loss by changes to the
mixture. Effective remedy is possible only by preheating intake
air.
• Fuelling without traces of water (use deerskin as filter).
• Generously sized water trap.
• Fuel line routing inclined.
• Prevent condensation of humidity, i.e. avoid temperature dif-
ferences between aircraft and fuel.
Fuels containing alcohol always carry a small amount of water
in solution. In case of temperature changes or increase of alco-
hol content, water or a mixture of alcohol and water may settle
BRP-Rotax
ATTENTION
and could cause troubles.
Page 3-7
January 01/2018