FlightMax EX5000
-20-
600-00105-000 Rev 01
Engine Instruments Lean Assist
The MFD is equipped with a lean assist function which is used to set the optimum
mixture for various operating conditions. The MFD will automatically detect whether
the pilot is leaning for best power or best economy and provide visual messages to
guide the pilot toward the correct mixture setting.
Leaning for Best Economy
1)
In order to lean the engine for best economy, begin by pressing the “Lean Assist”
button and smoothly lean the mixture control. Best Economy leaning should only
be undertaken at power levels below 75%.
2)
The MFD will annunciate "Looking for Peak" at the top of the temperatures section
of the display.
3)
As the TIT rises, the peak TIT will be detected and the MFD Engine Page will
annunciate “Best Economy,” indicating that the best economy mixture has been
achieved. Best Economy is indicated for temperatures between peak TIT and 20°F
to the lean side of Peak.
If 1650°F is detected prior to the TIT peak, the MFD will indicate “Best Economy”.
Best Economy will be indicated for temperatures from 1660°F to 1600°F.
4)
If the mixture is leaned too far to the
lean side, past the Best Economy
setting, the MFD shall annunciate
“Too Lean.” The pilot should slowly
enrichen the mixture until the annun-
ciation switches back to “Best
Economy.”
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” datablock
on the Map Page.
Engine Instruments - Lean Assist For Best
Economy (Saratoga II TC & Piper 6XT)
NOTE: It is important to adjust the mixture slowly and continuously.
Leaning the mixture too quickly could disrupt the MFD’s ability to
accurately track the peak TIT, and could result in a mixture setting
damaging to the engine.
CAUTION: If any of the CHT’s exceed 435°F or TIT exceeds 1660°F, the Lean
Assist function will be halted. Reducing power and increasing fuel flow is
recommended.
CAUTION: If at any time during the Lean Assist process the engine begins
to run roughly, richen the mixture until the roughness abates.