LeanFind Procedure—General Explanation
Lycoming and Continental engines have established
specific restrictions on leaning that must be followed, such
as percentage of power, climb leaning, and TIT limits.
Lycoming recommends operation at peak EGT for power
settings of 75% or lower, while Continental recommends
operation at peak EGT for power settings of 65% or lower.
This guide is not meant to supersede any specific
recommendations of the engine manufacturer or airframe
manufacturer.
It is your responsibility to know your aircraft’s
limitations.
Pre-lean the mixture to about 50° below peak. After pre-leaning, wait for
one minute for the temperatures to stabilize. Next, begin the leaning
process by tapping the LF button.
The LeanFind procedure will begin on the first engine you lean — the one
that first indicates a 15° EGT temperature rise. The examples below
assume the left engine is leaned first. Begin leaning the mixture. When a
15° rise occurs, the LeanFind mode becomes activated, shown when the
cylinder number above the column of the hottest cylinder begins flashing.
LeanFind is not active if a cylinder number is not blinking.
With the Fuel Flow Option, instead of seeing the word LF in the
display, you will see numerical fuel flow rate during the leaning
process on the right side of the digital display. This allows you to
observe the EGT rise and at the same time watch the fuel flow
rate decrease.
To show the progress of the leaning process, the EDM-760/790 selects the
hottest cylinder for reference in the digital display. In the example below,
the 1360 is the current temperature of the hottest cylinder. If the fuel flow
option in installed, instead of LF you will see the fuel flow rate, for
example 12.4.
Page 18 Engine Data Management
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