Cruise Leaning - Cirrus SR22 Pilot Operating Handbook

S 4: N
ECTION ORMAL
N P
ORMAL ROCEDURES

Cruise Leaning

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
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:
Mixture Description
Best Power
Best Economy
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.
Figure 4-2: Fuel Flow Reference For Leaning
MAXIMUM
CONTINUOUS:
The top of the upper green band is the Maximum Power Fuel Flow. The
bottom of the upper green band is the approximate reference fuel flow for
best power. The top of the lower green band is the approximate fuel flow
for best economy. These references are advisory guidance computed using
RPM, Manifold Pressure, and Manifold Air Temperature based on the
theoretical air fuel ratio associated with best power or best economy. Power
setting should be made using reference to lean of peak or rich of peak in
accordance with the Continental Engine Operator's and Maintenance
Manual.
4-20
P
ROCEDURES
65% power or less.
BEST POWER:
• N •
OTE
Exhaust Gas Temperature
75 °F Rich Of Peak EGT
50 °F Lean Of Peak EGT
C D
IRRUS
BEST
ECONOMY:
SR22_FM04_5541
P/N 13772-006
Reissue A
ESIGN
SR22