Garmin G3X Touch
™
Pilot’s Guide for Certified Aircraft
190-02472-00 Rev. D
90
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3.2 LEAN ASSIST MODE (OPTIONAL)
NOTE: The pilot should follow the engine manufacturer’s recommended
leaning procedures as described in the Pilot’s Operating Handbook (POH).
A Lean Assist Button is displayed on the Eng Page when Lean Assist Mode is enabled
and at least one Exhaust Gas Temperature (EGT) or Turbine Inlet Temperature (TIT)
input is configured (refer to the G3X Touch Installation Manual for more information).
Using Lean Assist Mode:
From the Main Tab of the Eng Page, touch Lean Assist. As the mixture is
leaned, one of the cylinders’ exhaust temperature will peak. Continuing to lean
the mixture will cause each additional cylinder to peak (if applicable) until the
last of the cylinders peaks. To cancel Lean Assist Mode, touch Lean Assist
again.
When the Lean Assist is selected, the Lean Assist Mode waits for a cylinder’s EGT
to reach a peak temperature and decrease by at least 7°F. To prevent detection of
false peaks, the system waits for a cylinder’s EGT to increase by at least 15°F before
detecting a peak. In addition, if the cylinder temperature rises above a previously
detected peak by more than 100°F, the previous peak is considered false.
The following bar graph is displayed when four or more EGT cylinders are configured
and the same number of EGT and CHT probes are configured. When each cylinder
peaks, its bar changes from green to blue, and the white EGT number changes to a
blue delta number. The blue delta number is the difference between current EGT and
peak EGT for each cylinder. The first cylinder to peak is identified with a solid blue box
around the delta number, and the last cylinder to peak is identified with a hollow blue
box. The outline and grey number above each bar displays the actual peak EGT value.
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