Garmin G3X TOUCH SYSTEM Flight Manual Supplement page 49

If the engine is warm, do not use the choke.
Throttle
•
Propeller area
•
Ignition
•
As soon as the engine fires up, release starter key to disconnect the
•
starter motor. If the engine does not fire after 10 seconds of starter
operation, stop and wait for at least 2 minutes for starter to cool-
down. Then try again.
An automatic electronic device adds the ignition with a time delay of
three seconds after the starter is actuated, which means that the starter
must always be operated for at least three seconds. The time delay
allows the propeller blades to be fully deployed before the engine starts,
and consequently reduces the loads for the propeller blades and their
corresponding stops. In case that the propeller blades are not fully
unfolded after two seconds, the engine start-up should be aborted
before the ignition comes on. In case of repeated problems to unfold
the propeller blades in time, make sure that the spring load of the
propeller blades is correct, and that the blades can be easily moved
and folded (  aircraft maintenance manual (AMM)).
If the engine fires before the expected time delay of three seconds is
over, i.e. in case of a malfunctioning electronic device, the following
checks must be performed before the intended flight in accordance
with the aircraft maintenance manual:  AMM section 5.3.13 item 5 for
the retarder module, and  AMM section 5.3.15 items 3 through 5 for
the propeller.
DOCUMENT NUMBER
L400-912816 ISSUEFEBRUARY 21 2020
FLIGHT MANUAL STEMME S12
NOTICE
CAUTION
CAUTION
IDLE (if engine is cold) / MAX 10% (if
engine is warm)
CLEAR of persons and obstacles
START (for a minimum of three
seconds)
PAGE: 4-27
REVISION: --
DATE: --- --, ----