Engine Start-Up - Pipistrel Sinus 503 Flight And Maintenance Manual

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SINUS motorglider
Normal procedures
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Engine start-up

Before engine start-up
CAUTION!
engine's limitations and engine manufacturer's safety warnings. Before engine start-up make
sure the area in front of the aircraft is clear. It is recommended to start-up the engine with air-
craft's nose pointing against the wind.
Make sure the fuel quantity will suffice for the planned flight duration.
Make sure the pitot tube is uncovered and rescue parachute safety pin removed.
Engage wheel brakes.
Engine start-up
Make sure both fuel valves are open and master switch in OFF position (key full left).
Set propeller pitch to flat (prop. pitch screw to the left fully).
Should the engine be cold, apply choke (lever full back).
Set master switch ON (key in full right position). Set both magneto switches ON.
Engage engine starter and keep it engaged until the engine starts.
For two-stroke engines, set throttle to at most 3500 RPM, for four-stroke engines to 2500 RPM.
Slide the choke lever forward gradually.
CAUTION!
the choke handle fully backwards and hold it there for some 20 seconds to make mixture richer.
Engine warm-up procedure
A two-stroke engine should be warmed-up at 3500 RPM, a four-stroke, however, at 2500 RPM up to
the point working temperature is reached.
Warming-up the engine you should:
1 Point aircraft's nose against the wind.
2 Verify the engine temperature ranges within operational limits.
CAUTION!
engine to overheat.
With wheel brakes engaged and control stick in full back position, first set engine power to 3500
RPM (two-stroke engine) or 4000 RPM (four-stroke engine) in order to perform the magneto check.
Set the magneto switches OFF and back ON one by one to verify RPM drop of not more than 250
RPM (two-stroke engines) or 300 RPM (four-stroke engine).
When the magneto check has been completed, add full power (throttle lever full forward) and
monitor engine's RPM. Make sure they range between maximum recommended and maximum
allowable RPM limits.
Note that engines do not reach 5800 RPM on ground. Engines are factory set to reach maximum
ground RPM of 5300 - 5500 at sea level at 20° C with propeller at minimum pitch setting. Maximum
ground RPM may vary depending on the season and service elevation.
CAUTION!
maximum allowable RPM on ground during this manoeuvre, check engine and wiring for correct
installation.
To ensure proper and safe use of aircraft it is essential for one to familiarise with
When the engine is very cold, the engine may refuse to start. Should this occur, jerk
Avoid engine warm-up at idle throttle as this causes sparks to turn dirty and the
Should engine's RPM be lower than max. recom. RPM on ground or in excess of
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