4-18 P/N 21399-004
Section 4 Cirrus Design
Normal Procedures SR20
Cruise
Normal cruising is performed between 55% and 85% power. The
engine power setting and corresponding fuel consumption for various
altitudes and temperatures can be determined by using the cruise data
in Section 5.
The selection of cruise altitude is made based on the most favorable
wind conditions and the desired power settings. These significant
factors should be considered on every trip to reduce fuel consumption.
• Note •
Mineral oil should be used for the first 25 hours of engine
operation or until oil consumption stabilizes (mineral oil
promotes better wear-in of piston rings during this period).
The first hour of engine operation should be at 75% power or
greater, with mixture maintained at best power (75°F to 125°
rich of peak EGT, provides higher cylinder pressures,
promoting better wear-in).
The second hour of engine operation should vary between
75% power and 65% power, with mixture at best power; power
should be varied between these two levels, changed every 15
to 30 minutes.
1. Fuel Pump................................................................................OFF
• Note •
The Fuel Pump may be used for vapor suppression during
cruise.
The Fuel Pump must be set to BOOST during maneuvering
flight (i.e. flight training maneuvers, chandelles, stalls, etc.).
2. Cruise Power ...........................................................................SET
3. Mixture ............................................................... LEAN as required
4. Engine Parameters ........................................................ MONITOR
• Note •
Fuel BOOST must be used for switching from one tank to
another. Failures to activate the Fuel Pump before transfer
could result in delayed restart if the engine should quit due to
fuel starvation.
5. Fuel Flow and Balance ..................................................MONITOR
Revision A1
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