MAINTENANCE MANUAL
Effectivity: All
Page 71-3
Edition 2 | Rev. 0
GENERAL
1. INTRODUCTION
The Sportstar RTC airplane is equipped with the engine ROTAX 912 ULS2 or ROTAX 912 S2.
The ROTAX 912 is a four-cylinder four-stroke engine with opposed cylinders and one camshaft. Valve
trains: OHV engine. Cylinder bore of the engine 84 mm, stroke 61 mm. Engine displacement 1352
cm
3
. The compression ratio 11:1.
The engine is cooled by air and liquid; the cylinders are cooled by ram air; the cylinder heads are
cooled by liquid.
The engine lubrication system is designed with a dry-sump.
The recommended kinds of oil are shown in Section 12-00.
The ignition is doubled, contactless, of a condenser type.
For a uniform distribution of mixture, the engine is equipped with two constant depression carburettors
BING and with a mechanical fuel pump. Mixture charging: atmospheric pressure. The recommended
kinds of fuel are shown in Section 12-00.
The engine is started electrically, using a starter (12 V; 0,7 kW).
The engine is equipped with the generator of alternate current with the 12 V / 20 A regulator (rectifier).
Optionally the engine can be equipped with an auxiliary generator driven from the reduction gear case
(see Section 24-30).
The propeller is driven by the crankshaft via the reducer with a gear ratio of 2,43:1. The sense of
propeller rotation (the output shaft of the reducer) is clockwise. The speed reducer of the crankshaft is
equipped with the torsional vibration damping and depending on a manufactured version it is also
equipped with a slipping coupling.
The monitored parameters of the fuel system and the oil system are described in Chapters 28, 77 and
79.
NOTE
The more detailed information concerning the engine
maintenance are shown in the document Maintenance Manual
(Line Maintenance) for Rotax Engine Type 912 Series, doc. No.
MML-912, 899191.
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