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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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05/04/16

Overview

The DC generation system supplies all DC electrical power to the aircraft. The DC generation system changes AC power to DC power and keeps DC power in storage. This power can start the APU, or give DC power temporarily if the system cannot convert AC power to DC power. External DC power can be used to bypass the DC generation system during ground operations.

05/04/16

DC Power Conversion

The DC power conversion system has four transformer rectifier units (TRUs) that change AC power to DC power. The TRUs are installed in the forward equipment compartment. The cockpit circuit-breaker panel (CCBP) supplies AC power to each TRU from one of the four aircraft AC power busses. Each TRU changes the AC power to DC power. The electrical-load distribution circuits in the DC power center (DCPC) connect the DC power outputs from the TRUs to the four DC power busses on the aircraft.

05/04/16

Battery System

The battery system has two batteries and two battery chargers. These are the APU battery and its battery charger, and the avionics battery and its battery charger. The avionics battery and its charger are installed in the forward equipment compartment. The APU battery and its charger are installed in the aft equipment compartment.

Each battery charger gets AC power and changes it to DC power. The APU battery charger gets AC power from the AC power center (ACPC). The avionics battery charger gets AC power from the CCBP. Each battery charger supplies DC power to charge its related battery and to keep it fully charged.

The APU battery is rated at 25.2 VDC and 42 Ahr. It keeps energy, which it gets from the APU battery charger, in storage. The APU battery supplies DC power to start an onboard APU. The APU battery is used during ground operations and during flight when there is no other electrical power.

The avionics battery is rated at 24 VDC and 25 Ahr. It keeps energy, which it gets from the avionics battery charger, in storage. The avionics battery supplies DC power to selected electronic equipment. The avionics battery is used during ground operations and during flight when there is no other electrical power.

The DC power output from the APU battery can be connected to the DCPC through a switched branch of the APU battery bus. The outputs from both batteries can be connected together in the DCPC. This gives 135 A DC for a minimum of 15 minutes in an emergency.

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