22) Test Run Of Engine - Rotax 914 F Maintenance Manual

12.3.22) Test run of engine

Page Date
110 1997 02 01
Ensure that all the operating fluids are replenished to the specified level.
Make sure that no tools are scattered in engine compartment. Check tight fit
of propeller. Anchor aircraft suitably to ground and place chocks under the
wheels. Secure area and make absolutely sure not to endanger any person
involved or onlookers.
WARNING: Always observe the engine while running from a secure
place. The cockpit must be occupied.
In succession:
— open fuel cock
— activate choke
— throttle to idle position
— main 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.
— start warming up period with running at 2000 rpm., continue with 2500
rpm. until oil temperature reaches 50° C (120° F).
— observe temperatures and oil pressure. At a steady oil pressure above
2 bar (29 psi) engine speed may be increased.
— Ignition check:
check the two ignition circuits at 4150 rpm. Speed drop with only one
ignition circuit must not exceed 300 rpm.; 120 rpm. max. difference of
speed by use of either circuit, A or B.
— Short full throttle run and check if engine reaches max. full throttle
speed. Consult aircraft manual for nominal engine 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
ignition key!
— replenish engine oil and coolant as required
— carry out leakage test
— register operations in log book
Main
914 F
Reference Modification no.
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