Test Run Of Engine - Rotax 912 Series Maintenance Manual

2.8)

Test run of engine

- Ensure that all the operating fluids (engine oil, coolant, fuel) are replenished
to the specified level.
- Make sure that no loose objects (e.g. tools) are scattered in the engine
compartment.
- Inspect tight fit of propeller.
- Anchor the aircraft suitably to ground and fix wheel chocks. Ensure that the
aircraft area is clear and safe, before starting the engine.
WARNING: Always observe the engine while running from a secure place
In succession:
- establish fuel supply.
- activate choke.
- throttle to idle position.
- master switch "ON".
- ignition for both ignition circuits "ON".
- press starter button for max. 10 sec. followed by a cooling period of 2 min.
- after engine start, observe oil pressure. Pressure has to be built up within 10
sec. If no rise, immediately shut down and investigate.
- start warm up period by running engine at 2000 engine rpm., approximately
for 2 minutes then proceed to 2500 engine rpm. until oil temperature reaches
50°C (120°F).
- observe temperatures and oil pressure. At a steady oil temperature above
50°C and oil pressure above 2 bar (29 psi) engine speed may be increased.
- ignition inspect as per the current Operator's Manual.
- conduct a short full throttle run and verify that the engine reaches the max. full
power speed. Consult the Aircraft Manual for maximal speed as it depends
on the propeller used.
- after full-load run, allow a short cooling period to prevent formation of vapour
lock in cylinder heads.
- stop engine.
WARNING: When stopping the engine, switch off ignition and remove the
Effectivity: 912 Series
AIRCRAFT ENGINES
MAINTENANCE MANUAL
and verify that the cockpit is occupied.
ignition key.
12-00-00
page 12
Rev. 1, Jan. 01/2002