Electrics - EICAS Messages

Message Level Light Condition
APU BAT DISCH Advisory APU BAT
DISCH
APU battery is discharging.
Message Level Light Condition
MAIN BAT DISCH Advisory

DISCH

MAIN BAT DISCH

Main Battery is discharging.
Message Level Light Condition
L AC BUS OFF
R AC BUS OFF
Caution BUS OFF AC Bus is unpowered.
APU GEN OFF Advisory OFF APU Generator control breaker is open due to a fault with the APU running.
BATTERY OFF Advisory OFF Battery Switch is OFF.
L BUS ISOLATED
R BUS ISOLATED
Advisory ISLN Bus Tie Breaker is open open due to an AC electrical system fault.
L GEN DRIVE
R GEN DRIVE
Advisory DRIVE Generator Drive oil pressure is low or generator drive oil temperature is high.
L GEN OFF
R GEN OFF

Advisory

Caution

OFF Generator Control Breaker is open.
Message Level Light Condition
STANDBY BUS OFF Advisory OFF Standby AC or DC Bus is unpowered.
L UTIL BUS OFF
R UTIL BUS OFF
Advisory OFF Galley and Utility Buses are unpowered.

Engines and APU