C42E 540kg LSA POH Issue 3 China 15.03.2016
Page 15 of 36
4.2 Engine starting
Description:
The 912ULS is 4 cylinder, four stroke, horizontally opposed engines. This is cooled by a combination of
air-cooled cylinders and liquid cooled heads. The engine oil is cooled with a special oil / water heat
exchanger.
The C42E 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. AKI 91 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 912ULS,
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 ensure that :
Brakes ON
Aircraft FACING A SAFE DIRECTION AND AREA CLEAR ALL AROUND
Flap NEUTRAL (no flap)
Non essential electrics TURNED OFF
Carb Heat OFF
Main fuel shut off valve OPEN
Master switch ON
Electric fuel pump ON
Throttle at idle FULL AFT
Magnetos (both) ON
Propeller area CLEAR
Rear of aircraft CLEAR
Choke PULLED OUT
Shout “CLEAR PROP”
START ENGINE
After engine starts, choke OFF
Check: OIL PRESSURE RISING*.
* If Oil pressure does not rise turn off engine immediately.
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!
Note: 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 4000 rpm by turning off each ignition switch in turn. The
engine speed drop should not exceed 300 rpm with a maximum difference of 115 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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