Pipistrel Virus 912, Flight And Maintenance Manual, Page: 34 / 108

34
VIRUS
www.pipistrel.si
REV. 0
35
VIRUS
www.pipistrel.si
REV. 0
Engine start-up
Before engine start-up
CAUTION!
To ensure proper and safe use of aircraft it is essential for one to familiarise with
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 knob screwed 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.
Set throttle to 2500 RPM.
Slide the choke lever forward gradually.
CAUTION!
When the engine is very cold, the engine may refuse to start. Should this occur, jerk
the choke handle fully backwards and hold it there for some 20 seconds to make mixture richer.
Engine warm-up procedure
The engine should be warmed-up 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!
Avoid engine warm-up at idle throttle as this causes sparks to turn dirty and the
engine to overheat.
With wheel brakes engaged and control stick in full back position, first set engine power to 4000
RPM 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 300 RPM.
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!
Should engine’s RPM be lower than max. recom. RPM on ground or in excess of
maximum allowable RPM on ground during this manoeuvre, check engine and wiring for correct
installation.
Normal procedures