Garmin G2000 Cockpit Reference Manual page 169

Appendix
Accesses environmental controls (air conditioning, defogger, fan speed,
etc.)
Controls Annunciator system test.
Shows additional EIS information in a display plane. Refer to the EIS
section for more information.
Performs fuel calculations (Fuel Remaining/Used, Endurance, Range).
Refer to the EIS section for more information.
Activates Lean Assist Mode on the display pane. Provides additional
indications for performing engine leaning procedures on the EIS display.
Refer to the EIS section for more information about the Lean Assist
feature.
Enables/disables supplemental oxygen system. Refer to the EIS section
for more information.
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190-01264-01 Rev. A Garmin G2000 Cockpit Reference Guide for the Cessna Corvalis T240