For Your Safe Flight Page | 27
Lean Find-Activation: When a 15° EGT rise occurs, Lean Find activates
(indicated by a cylinder I.D. box flashing over the number of the hottest
EGT). Remember: The Lean Find mode is not active until a cylinder
I.D. box is flashing. To show the progress of the leaning process, the
EDM now displays the hottest EGT in the left side of the digital display
and the fuel flow in the right side. This information allows you to observe
the EGT behavior throughout the leaning process.
Lean Find - Rich Of Peak Detection: Eventually, one cylinder will reach
peak before any of the other cylinders. The EDM will determine this
automatically. The EDM will indicate success in finding a peak by
displaying the word LEANEST for two seconds and flashing the peaked
EGT column. The Scanner® Information Area will also display the current
value for the peaked EGT and fuel flow value, for final adjustment of the
mixture. The peak EGT and FF value when peak occurred is
remembered by the EDM and can be displayed by holding the PEAK
button.
Lean Find - Finalizing the Rich Of Peak Mixture: You may now
enrichen the mixture to operate at peak or continue enriching to a value
of your choice (typically between 50 to 100° rich of peak for best power),
consistent with the procedures defined in your aircraft and/or engine
manual. You can tap PEAK to see the current difference (delta) from the
peak temperature. This is handy for finalizing mixture. Note: If you lean
too much, the EGT will drop off on the lean side of peak. Enrichen if this
occurs and set final mixture rich of peak. Tapping EXIT exits the lean find
mode and automatic scanning resumes.
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