200 kPa
Wheels pressures for tires are stated on placards stuck on the aeroplane, also. A car
pump or a compressor or a pressure bottle may be used to pump a wheel.
3.14 Winter operation
3.14.1 General
The aeroplane is considered as a winter one, if outside temperature falls below + 5°C ,
the aeroplane must be prepared for winter operation.
3.14.2 Preparing the aeroplane for winter operation
Aeroplane airframe:
• Lubricate the aeroplane per Lubricating Chart, if from the last 100 hrs. Inspection did
not pass more than 6 months.
• Check fuel tank venting.
• Check attachment of wing, ailerons, flaps and tail units; lubricate per Lubricating
Chart.
Power plant
• The cooling system of the cylinder heads is filled with the mixture of the non-
freezing liquid and water, which protects the cooling system against the freezing up
to – 18 ° C. If the temperature is below this value, the coolant must be drained or
renewal with pure the non-freezing liquid. The coolant must be renewal after each
two years. Use only coolant according to the current Operator’s Manual for engine
ROTAX 912 UL / 912 S2.
• Fill engine oil suitable for low temperatures. The required operation oil temperature
and operation temperature of the coolant are not reached in the winter operation. The
oil temperature must be higher than 90°C.
• Cover the oil cooler face or a part of face only. Cover a part of radiator face by
means of a width adhesive tap so, that is a small 10 – 15 cm width slot for cooling
and for the inlet of air for the heating. The oil tank must be isolated by means of
suitable thermal insulation in case of the lower outside temperatures.
CAUTION
The limit temperatures of the coolant, cylinder heads and oil
must be kept after these arrangements.
• Check electrode gap of the spar plugsand adjust as necessary or renew as required.
Date: 01.03.2002 WT-9 Dynamic Section 3 Page 3 - 22
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