Page 16 Engine Data Management
Continue leaning slowly. With a vernier mixture control, turn the knob
about a quarter turn every second. With a non-vernier or quadrant
mixture control, lean slowly and smoothly about 1/16 inch every five
seconds. Eventually, one cylinder will reach peak before any of the other
cylinders. The EDM will determine this automatically. Notice that this
cylinder does not necessarily have the hottest EGT.
The EDM will indicate success in finding a peak by displaying the words
LEANEST for two seconds, followed by flashing the column and
displaying the value of the EGT of the cylinder that peaked first. The
word SET will also be displayed. (With the Fuel Flow Option the current
fuel flow rate will be displayed on the right side of the digital display
instead of the word SET.) The flashing cylinder will be locked—or
set—into the digital display during the remainder of the LeanFind
procedure to allow you to set the final mixture. The peak EGT value is
remembered by the EDM and will be displayed as long as you hold the
LF button.
You may now enrichen the mixture to operate at peak or continue
enriching to 100° rich of peak, or a value of your choice, consistent with
the procedures defined in your aircraft engine manual.
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