Appendix D – SYS Pages D-19
USING LEAN ASSIST
This feature is intended to aid you in setting the optimum mixture
for various operating conditions. When in Lean Assist mode, the
system will automatically detect whether you are leaning for best
power or best economy and provide visual indications to guide
you toward the correct mixture setting.
Note: It is very important that you adjust the mixture slowly and
continuously. Leaning the mixture too quickly can disrupt the
system’s ability to accurately track the peak EGT, and could
result in a mixture setting that can damage the engine. Always
be sure to monitor Oil Temperature and CHT readings to ensure
they stay within specified limits. If, at any time during the Lean
Assist process, the engine begins to run roughly, richen the
mixture slightly until the roughness abates.
For Cirrus aircraft:
To lean the engine for Best Power, begin by pressing the “Start
Lean Assist” (LSK R4) and smoothly lean the mixture control.
The engine tab displays “Looking for Peak” in the Lean Assist
Status box. When leaning for best power, the final mixture setting
is based on the first cylinder to peak, indicated by a message.
When this happens, you can begin to richen the mixture. As the
mixture is richened, the display first annunciates “Looking for #x
to Peak (Rich)”, then “Peak Detected (Rich)” as it determines the
peak temperature. Finally, “Best Power” displays when the
optimum best power mixture has been achieved. Exit the Lean
Assist function by pressing the “End Lean Assist” (LSK R4).
To lean the engine for Best Economy, ensure the engine is
below 75%, press the “Start Lean Assist” (LSK R4), and smoothly
lean the mixture control. The same “Looking for Peak” message
is displayed which will eventually change to “Looking for Last
Peak” as the leaning continues. Continue slowly leaning after
“Last Peak Detected” is displayed until “Best Economy” has been
achieved. At that point, exit the Lean Assist function by pressing
the “End Lean Assist” (LSK R4).
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