C42 Owner’s Manual (Microlight) Page 10
SECTION 3 - OPERATION OF THE POWERPLANT
Description:
The Rotax 912 and 912S are 4 cylinder, four stroke, horizontally opposed engines. They are cooled by a
combination of air-cooled cylinders and liquid cooled heads. The engine oil is also air-cooled with a
small radiator.
The B Model aircraft utilise an oil/water heat exchanger in place of the oil radiator. A carburettor heat
control is also fitted which draws air from around the exhaust, via the usual air filter. This should only be
activated if carburettor icing is suspected (see Emergency Procedures sction).
Fuel Type: Min 91 Octane for the 80 hp, Min. 95 Octane for the 100 hp engine (RM/2 method)
automotive gasoline leaded or unleaded or AVGAS 100 LL . Prolonged use of AVGAS can cause
damage to the Rotax 912, precludes use of fully synthetic oil and requires more frequent oil and oil filter
changes. Please study the Rotax engine operating manual.
CAUTION: Never handle the propeller with the ignition on.
To Start:
Main fuel valve, OPEN
M
aster switch
ON
E
lectric fuel pump ON
Th
rottle at idle
FULL
AFT
Brakes ON
M
ags (both)
O
N
P
ropeller area
C
LEAR
Rear of aircraft CLEAR
Ch
oke (pulled out) ON Start
After engine starts, choke OFF
Ch
eck:
OI
L PRESSURE RISING.
Note: If the engine doesn’t start, repeat the procedure. If the engine floods, close the main fuel valve,
half open the throttle and turn over the engine. When it starts, reduce the throttle quickly to idle (2000
rpm) and turn on the fuel.
Open the main fuel valve - don’t forget!
Not
e: A water-cooled four stroke engine requires a fairly long warm up period. Run the engine at 2000
rpm for 2 minutes minimum then at 2500 rpm until the oil temperature is at least 120°F (50° C). Perform
an ignition system check at 3500 rpm by turning off each ignition switch in turn. The engine speed drop
should not exceed 300 rpm with a maximum difference of 120 rpm.
Failure to let the oil temperature reach 50°C can result in
carburettor ice forming during takeoff. It is imperative
that this procedure is followed otherwise serious injury or
death may result.
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