Electrical Installation; Power Distribution - Garmin G1000 Maintenance Manual

2.2 Electrical Installation

2.2.1 Power Distribution

Distribution of power to the G1000 system occurs on four aircraft electrical buses. See Figure 2-11 for
diagram.
Left Bus: The left bus is tied directly to the aircraft left battery (battery 1) via the left battery master
switch. When the left battery master switch is turned on, power is immediately supplied to the left bus.
The left bus will also receive power from the right bus when the cross tie relay is closed. The cross tie
relay is operated by the switch in the overhead console.
Right Bus: The right bus is tied directly to the right battery via the right battery master switch. When the
right battery master switch is turned on, power is immediately supplied to the right bus. The right bus will
also receive power from the left bus when the cross tie relay is closed. The cross tie relay is operated by
the switch in the overhead console.
Essential Bus: The essential bus is diode-fed from the left and right buses. When either the left or right
battery master switch is turned on, power is immediately supplied to the essential bus.
Avionics Bus: The Avionics bus is tied to the left and right bus via the avionics master switch.
Page 2-8 G1000-Columbia 350/400 System Maintenance Manual
Revision C 190-00577-03