Airplane Factory SLING 2
Pilot Operating Handbook
Page | 7-20
DC-POH-002-X-B-6
Revision : 2.6
7.13
Engine
The Rotax 912 ULS engine is a 4-stroke, 4-cylinder, horizontally opposed,
spark ignition engine with one central camshaft-push-rod-OHV. The engine
features liquid cooled cylinder heads with air cooled cylinders. It utilizes dry
sump forced lubrication and has a dual contactless capacitor discharge
magneto type ignition system. The engine is fitted with an electric starter,
AC generator (alternator) and mechanical fuel pump. A back-up electrical
fuel pump is fitted.
Propeller drive is via reduction gear with integrated
shock absorber. The engine will continue to run after an alternator and / or
battery failure.
See the manufacturer documentation and applicable supplements to this
Pilot operating Handbook for applicable information should the airplane be
fitted with a Rotax 914 UL or a Rotax 912 iS engine.
7.14
Cooling system (914 UL / 912 ULS / 912 iS)
Cylinders are air cooled.
Cylinder heads are liquid cooled via a closed circuit system with an
expansion tank. A camshaft driven coolant pump circulates coolant from a
radiator through the cylinder heads, then through an expansion bottle and
back to the radiator.
The expansion tank is closed by a pressure cap. At temperature rise of the
coolant an excess pressure valve in the expansion tank opens and coolant
flows (via a hose) at atmospheric pressure to an overflow bottle mounted
on the firewall. When cooling down the coolant in the overflow bottle is
sucked back into the cooling circuit.
Refer to the latest revision / edition of the applicable Rotax engine operator
and maintenance manuals.