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5. Fuel Pump................................................................................OFF
• Note •
Fuel BOOST should be left ON during takeoff and for climb as
required for vapor suppression with hot or warm fuel.
March 2010
Information Manual 4-19
Cirrus Design Section 4
SR20 Normal Procedures
Cruise
Normal cruising is performed between 55% and 75% 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 on the basis of the most
favorable wind conditions and the use of low power settings. These
significant factors should be considered on every trip to reduce fuel
consumption.
• Note •
For engine break-in, cruise at a minimum of 75% power until
the engine has been operated for at least 25 hours or until oil
consumption has stabilized. Operation at this higher power will
ensure proper seating of the rings, is applicable to new
engines, and engines in service following cylinder
replacement or top overhaul of one or more cylinders.
1. Fuel Pump ...............................................................................OFF
• Note •
The Fuel Pump may be used for vapor suppression during
cruise.
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
March 2010
4-20 Information Manual
Section 4 Cirrus Design
Normal Procedures SR20
Cruise Leaning
The engine is equipped with an altitude compensating fuel pump that
automatically provides the proper full rich mixture. Because of this, the
mixture should be set to full rich to allow the aneroid to provide auto
leaning for the engine during all flight conditions. If additional cruise
leaning beyond that provided by the aneroid is desired, be advised that
there may not be a 75° temperature rise from full rich to peak. This is
acceptable provided the airplane is at 75% power or less and engine
temperatures are within limits.
• Caution •
If moving the mixture control from the full rich position only
decreases the EGT from the full rich value, place the mixture
control back in the full forward position and have the fuel
system serviced.
Exhaust gas temperature (EGT) may be used as an aid for mixture
leaning in cruise flight. For “Best Power” use 75% power or less.
For “Best Economy” use 65% power or less. To adjust the mixture,
lean to establish the peak EGT as a reference point and then adjust
the mixture by the desired increment based on the following table:
Under some conditions, engine roughness may occur while operating
at best economy. If this occurs, enrich mixture as required to smooth
engine operation. Any change in altitude or Power Lever position will
require a recheck of EGT indication.
Mixture Description Exhaust Gas Temperature
Best Power 75° F Rich Of Peak EGT
Best Economy 50° F Lean Of Peak EGT
March 2010
Information Manual 4-21
Cirrus Design Section 4
SR20 Normal Procedures
Descent
1. Altimeter................................................................................... SET
2. Cabin Heat/Defrost ................................................ AS REQUIRED
3. Landing Light .............................................................................ON
4. Fuel System....................................................................... CHECK
5. Mixture ................................................................... AS REQUIRED
6. Brake Pressure .................................................................. CHECK
Before Landing
1. Seat Belt and Shoulder Harness .....................................SECURE
2. Fuel Pump ......................................................................... BOOST
3. Mixture ......................................................................... FULL RICH
4. Flaps ...................................................................... AS REQUIRED
5. Autopilot ................................................................. AS REQUIRED
　
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