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Jan. 01/2007
Effectivity: 447 SCDI, 503 DCDI,
582 DCDI
OM Edition 1 / Rev. 0
BRP-Rotax
Noise:
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 ROTAX.
Winter:
Winter can create additional problems such as carburetor icing,
frozen fuel lines, higher air densities etc., which may affect
carburetor calibration and require longer warm-up periods.
Carburetor icing:
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 system
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.
Remedies:
- Fuelling without traces of water (use shammy as filter).
- Generously sized water trap.
- Fuel line routing inclined.
- Prevent condensation of humidity, i.e. avoid temperature
differences between aircraft and fuel.
■ CAUTION: 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.
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