Essential power is defined as "that power that is necessary to continue the flight indefinitely."It is the power necessary to operate the items that are essential to flight. Any generator on-board is capable of providing essential power to the flight critical systems.
The Essential Power selector switch is located on the lower right hand corner of the Electrical Panel.
The switch has two basic modes of selection, MANUAL and AUTO. The switch position determines the source of power to the AC Essential Bus.
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