WT-9 Dynamic Club S FLIGHT MANUAL Section 7 Page 7-6
7.9 Powerplant
Standard powerplant consists of 4 cylinder horizontally opposed, 4-stroke engine
ROTAX 912 ULS with power 73
kW and a three blade in flight electrically
adjustable airplane propeller. This engine is suitable for ultralight airplane, but it
must never fly at locations, airspeeds, altitudes, or in any other circumstances from
which a successful no-power landing cannot be made, after sudden engine stoppage.
Description
ROTAX 912 ULS is 4-stroke, 4 cylinders horizontally opposed, spark ignition
engine, one central camshaft-push-rods-OHV. Liquid cooled cylinder heads, ram air
cooled cylinders. Dry sump forced lubrication. The engine is fitted with electric
starter, AC generator, mechanical fuel pump and the reduction gear with integrated
shock absorber. Refer to the Operator’s Manual for all versions of ROTAX 912 ULS
for more details about versions difference.
WARNING
Due to carburettors, flights in icing conditions are prohibited.
The cooling system of the engine is designed for liquid cooling of the cylinder heads
and ram-air cooling of the cylinders. As coolant for the cooling system 50 %
antifreeze concentrate with additives against corrosion and 50 % pure water is used.
Satisfactory results were achieved with “BASF Glysantin Anticorrosion”. Use this or
equivalent coolant. The coolant must be renewed every two years. Refer to the
Operator’s Manual for all versions of ROTAX 912 ULS for renewal of the coolant.
The periodic inspections are structured on 25, 50, 100 and 200 hours check which
must be performed according to the maintenance schedule.
There are two laminated cowlings ( upper and lower ) which cover the engine
suspended at the engine bed. The disassembly and assembly of the upper cowling is
easy – just release the quick-closing locks. The upper cowling is usually removed
during engine pre-flight inspection to check the engine compartment, operating fluids
quantity ( oil, coolant ) and to check engine installation.
After removing the upper cowling of the engine, check the following:
1. Oil quantity check: Remove the cover of the oil tank (3). The oil level in the oil
tank should be between two marks ( max./min. ) on the dip-
stick, but must never fall below the min. mark.
2. Coolant quantity check: Remove the cover of the expansion tank (7). The coolant
level in the overflow bottle should be between min. and
max. mark.
Date: 1.12.2001
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