DESCRIPTION OF AIRPLANE AND SYSTEMS / ENGINE 7-19
CHANGE A2 ICON A5-B / PILOT’S OPERATING HANDBOOK
CHAPTER 7
7.10 ENGINE
The A5-B is powered by a Rotax 912iSc2 Sport fuel injected
4-cylinder engine, rated at 100 hp (73.5 kW) at 5800 RPM. The
912iSc2 Sport is based on the proven 912 ULS engine with
significant upgrades to improve performance and reliability. It is
equipped with an electric starter, dual-redundant ignition system,
and a fully digital Engine Control Unit (ECU) that automatically
adjusts fuel/air mixture throughout flight to maintain optimal
performance, efficiency and low emissions, thereby reducing fuel
consumption and overall operating costs. The ECU also obviates the
need for a carburetor and associated mixture controls in the
cockpit, making operation of the engine fully automatic for the pilot
and eliminating the threat of carburetor icing. The 912iSc2 Sport is
both liquid cooled (cylinders heads) and air-cooled (cylinders) with a
dry sump forced lubrication system and separate oil tank. It can run
on either Aviation Gasoline (AVGAS), motor gasoline (MOGAS), or a
combination of both. Engine cooling on the A5-B is augmented by a
fan located on the propeller shaft ahead of the spinner. Best cooling
on the ground is achieved with engine set from 3000 to 4000 RPM.
Commanded throttle position is sensed and transmitted to the ECU
as a pilot request for specific power output. This signal is then
combined with environmental inputs to provide the commanded
response. The interface is simple and seamless for the pilot,
automating the process of adjusting fuel/air mixture and ensuring
optimal performance. Move the throttle and the engine does the
rest.
Engine power is displayed as RPM on the tachometer gauge on the
right lower flight instrument cluster. Fuel flow is directly proportional
to this RPM, although actual power output and useful thrust
delivered is a function of both RPM and aircraft density altitude.
Normal operating range is from 1700 to 5500 RPM with a redline of
5800 RPM.
7.11 PROPELLER
The A5-B uses a Sensenich, 3-blade propeller. The blade
construction is hollow carbon fiber and fiberglass with UV
protection. The blade leading edges are equipped with metal
erosion shields. The two-piece hub is made from anodized
aluminum.
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