Cold Weather Operation - Rotax 912 ULS 3 Operator's Manual

3.9) Cold weather operation

General note
Coolant
Lubricant
Cold start
Icing in the air in-
take system
Remedy
Effectivity: 912 Serie
OM Edition 2 / Rev. 0
Generally, an engine service should be carried out before the start
of the cold season.
For selection of coolant and mixing ratio, see "Coolant",
Chapter 2.3)
For selection of oil, see table of Lubricants
- With throttle closed and choke activated (open throttle renders
starting carb ineffective).
- Be aware, no spark below crankshaft speed of 220 rpm (pro-
peller speed of 90 rpm).
- As performance of electric starter is greatly reduced when hot,
limit starting to periods not much longer than 10 sec. With a
well charged battery, adding a second battery will not improve
cold starts.
Remedy - Cold start
Step
1 Use of multigrade oil with the low end viscosity code of 5 or
10.
2 Gap electrode on spark plug to the minimum or fit new
spark plugs.
3 Preheat engine.
Icing due to humidity
Carburetor icing due to humidity may occur on the venturi and on
the throttle valve due to fuel evaporation and leads to perfor-
mance loss and change in mixture.
- Intake air pre-heating is the only effective remedy. See Flight
Manual supplied by the aircraft manufacturer.
BRP-Powertrain
Chapter 2.5)
Procedure
April 01/2010
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page 3-11