Operation In Flight - Bombardier-Rotax 377 UL Operator's Manual

Diagram for torque sequence when
manifolds are in place
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NOTE: Consider both cylinders as one unit because they are joined by exhaust and intake manifolds.
Use a cross sequence for 'tightening the nuts, starting from the center. Ensure that cowl screws
are torqued less than head nuts.
1117
Ignition point rubbing blocks wear rapidly during the first hours of operation till they "polish-in" on
the cam of crankshaft, therefore the points gap will require adjustment after break-in (betw. 8to 20
hrs.).
• Refer to ignition timing procedure. After _initial break-in adjustment is performed, only normal
maintenance is required (see maintenance schedule).
Section 6
6) Operation in flight:
It is recommended to use full throttle during take-off climb. Slight throttle reduction may create a
leaner mixture and must be avoided.Select a cruising speed where the engine is running smooth.
• Do not-exceed maximum engine rpm (refer section 18 technical data).
During cruise and descending it is very important not to create a lean condition with high rpm and
low throttle opening. The less fresh charge the engine gets, the more hot residual gas remains in the
cylinder. This raises the temperatures to a critical level. For this reason, you may also experience
higher exhaust gas and cylinder head temperatures at reduced throttle openings.
Idling r.p.m. is 2000 minimum. High idle setting will reduce enrichment action of starting system in
carburetor (choke), making cold starting difficult.,
Prior to shutdown, engine should be run for a few minutes at the lowest smooth running r. p.m. to cool
, down, depending on previous power setting.
Do not idle for prolonged periods as normal rich condition at this power setting can cause unnecessary
, carbon deposits and spark plug fouling. Avoid running conditions where gearbox shaking occurs.