D-20 Appendix D – SYS Pages
For Piper Matrix aircraft:
To lean the engine for cruise, 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 in the lower-left of the display. When the TIT has peaked, the
status will change to “Best Economy”. Exit the Lean Assist
function by pressing the “End Lean Assist” (LSK R4).
If the fuel flow is increased after the peak occurs, the message
“Lean for Peak or Reset” is displayed in the Lean Assist status
box. In this event, the engine should be re-leaned by adjusting
the mixture and look for the message “Looking for Peak” again.
“Best Economy” should be expected to be displayed if the TIT
reaches 1750 degree.
If the TIT falls by more than 20 degrees from peak, the message
“Too Lean” will be displayed in the Lean Assist status box.
OTHER ENGINE GAUGES
Depending on the aircraft type, there may be other options for
engine displays to include Fuel Quantity indicators, De-ice
Vacuum gauges, Vacuum gauges, etc. The image below
indicates the locations for these extra gauges when available.
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