When taking-o, always make sure propeller is set to minimum pitch to ensure maximum engine
eciency. To set the propeller to minimum pitch, screw the propeller pitch knob located on the in-
strument panel counter clockwise completely. Prior to taking-o, engine and propeller ground check
must be performed. At full power and propeller pitch at minimum, RPM must not exceed designated
limits. Verify also, that the RPM drop signicantly when setting propeller pitch to maximum setting
(knob screwed to the right fully, but not feathered!). When returning propeller pitch back to mini-
mum setting, the RPM must reach same initial value as before engine and propeller ground check!
CAUTION! Verify RPM and engine parameters multiple times.
If propeller pitch is increased (rotate knob clockwise), engine’s RPM will drop. Do not, under any
circumstances, allow engine underrotation. Should this occur, immediately decrease prop. pitch to
regain proper engine cruise parameters.
WARNING! Both engine under- and overrotation may cause signicant damage to the en-
gine and propeller.
Propeller feathering
WARNING! Feather propeller only after the engine has stopped and at minimum pitch.
To feather the propeller, rst reduce airspeed to 90 km/h (50 kts), then pull the propeller pitch knob’s
metal base backwards fully and then rotate it 20° clockwise. A propeller pitch of approximately 70° is
reached by doing so. To feather the propeller fully (90°), rotate the knob clockwise a couple of times
until it stops.
Propeller unfeathering
To unfeather the propeller, rst reduce airspeed to 90 km/h (50 kts) and screw the propeller pitch
knob to the left fully. Then pull the propeller pitch knob’s metal base slightly, rotate it counter clock-
wise for 20° and gently push it all the way to the instrument panel.
WARNING! Do not, under any circumstances, attempt to restart the engine while the propel-
ler is feathered. This would most denitely result in engine, propeller and/or aircraft’s structural
damage.
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