600-00105-000 Rev 01
-21-
FlightMax EX5000
Leaning for Best Power
When leaning for best power, the final mixture setting is based on the peak TIT
minus 125°F. The Lycoming Operator’s manual recommends the best power be
achieved by adjusting the mixture from a full rich position.
1)
In order to lean the engine for best power, begin by pressing the “Lean Assist”
button and smoothly lean the mixture control.
2)
The MFD will annunciate "Looking for Peak" at the top of the temperatures section
of the display.
3)
When Best Economy is detected, richen the mixture.
4)
As the mixture is richened the display will first annunciate “Set mixture to full rich”.
When a full rich mixture is detected the annucation will change to “Lean to 125°
Below Peak TIT.”
When the mixture is leaned to full rich, the manifold pressure and RPM may
change slightly, re-adjust as necessary.
When the TIT Best Power Temperature is achieved the display will annunciate
“Best Power”.
If after Best Power is reached the TIT becomes more than 145° below
peak, the display will be “Rich of Best Power.”
If after Best Power is reached the TIT becomes less than 105° below peak,
the display will be “Lean of Best Power”.
In either Lean or Rich of Best Power cases, the pilot should slowly adjust
the mixture to the Best Power TIT.
5)
After the desired engine lean setting is achieved, press the “Normalize” or
“Absolute” button to exit the Lean Assist function. The Lean State is also displayed
in the “Lean” Map page Datablock.
6)
To return to a Best Economy setting after using Best Power, move the mixture to full
rich and then press the Lean Assist button to go to the beginning of the Lean Assist
procedure.
Engine Instruments - Lean Assist For Best Power
(Saratoga II TC & Piper 6XT)
NOTE: The MFD will wait for TIT to stabilize before commanding this step.
