Test Run Of Engine - Rotax MML-912 Maintenance Manual

8) Test run of engine

General note
Preparation of the engine for test run:
Preparation
- Ensure that all the operating fluids (engine oil, coolant, fuel) are
- Make sure that no loose objects (e.g. tools) are left in the engine com-
- Inspect tight fit of the propeller.
- Anchor the aircraft suitably to the ground and fix wheel chocks. Ensure
Test run as follows:
Test run
Step
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5
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Effectivity: 912 Series
Edition 2 / Rev. 0
BRP-Powertrain
MAINTENANCE MANUAL
Danger of life threatening injuries caused by the pro-
WARNING WARNUNG
peller, rotating and stressed parts of the engine!
Always observe the engine from a safe place while it is
running. Check that the cockpit is occupied by a com-
petent operator.
replenished to the specified level.
partment.
that the propeller zone is clear and safe before starting the engine.
Establish fuel supply (open fuel cock).
Activate choke.
Throttle lever to idle position.
Master switch "ON".
Ignition for both ignition circuits "ON".
Press starter switch for max. 10 sec. (followed by a cooling period of 2 min.).
After engine start, observe oil pressure. Oil pressure has to be built up within
10 sec.
Let engine run for approx. 2 min. at 2000 rpm. Then first use the throttle lever
to bring the engine to approx. 2500 rpm and then run through warming up pe-
riod, until the oil temperature reaches 50 °C (122 °F).
Check temperatures and oil pressure: At a steady oil temperature above
50 °C (122 °F) and oil pressure above 2 bar (29 psi) engine speed may be in-
creased.
Ignition check as per the current Operators Manual.
Conduct a short full throttle run and check that the engine reaches the max.
full power speed. Consult the pilot's operating handbook for maximum speed,
as it depends on the propeller used.
After full-load run, conduct a short cooling run to prevent formation of vapour
lock in cylinder heads. This is necessary to prevent steam locks in the cooling
and fuel system after shut-down.
Shut engine down.
NOTE:
Procedure
On switching off the engine switch off ignition and withdraw
the ignition key.
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October 01/2009