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(WARNING)
RED MESSAGE (CAUTION)
AMBER MESSAGE (ADVISORY)
CYAN MESSAGE (STATUS)
WHITE MESSAGE Require immediate crew attention. These messages are accompanied by flashing master warning, triple chime attenson with or without voice message or dedicated tone. Require immediate crew awareness and future crew action may be required in the form of alternate system selection or performance limitation. These message are accompanied by flashing master caution and a single chime. Indicate safe or normal system operation which require crew awareness, over and above the dark cockpit philosophy. Indicate minor failures or reduction in systems capability, which require no crew action.

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05/02/16

Overview

The AC power generation system supplies and controls the 3-phase, 115 VAC power supply for the aircraft.

The electrical control of the AC power supply is done by the components that follow:

  • The generator control units (GCUs)
  • The ELECTRICAL control panel

Each GCU adjusts the voltage output of one generator, and controls the contactors installed in the AC power center (ACPC).

The ELECTRICAL control panel is used to put the AC power generators on-line, to control the external power application, and to start battery power. It is installed on the overhead panel in the flight compartment.

The four variable frequency generators (VFGs) are kept cool by the VFG oil system.

The pump for the VFG oil-management system is installed at one end of the VFG, opposite to the drive. Oil from the sump/reservoir of each VFG lubricates the bearings and keeps the VFG cool.

The electrical power for the equipments that cannot be connected directly to the aircraft electrical system is supplied by the Power Converter System. This system supplies electrical power at a fixed frequency which is distributed to the cabin printer and electrical power outlets installed in the cockpit and cabin.

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