OPERATIONS MANUAL

Electrical
EICAS Messages:
CAUTION MESSAGES (accompanied by caution light and beeper sound)
ELEC AC BUS ()
ISLN
LIGHT
OFF
LIGHT
AC bus (1, 2, 3, or 4) is not powered
ELEC GEN OFF ()
OFF
LIGHT
IDG (1, 2, 3, or 4) generator breaker is open
while engine is running
[message inhibited by ELEC AC BUS ()]
>BAT DISCH APU
>BAT DISCH MAIN
>BATTERY OFF
>DRIVE DISC ()
ELEC BUS ISLN ()
ELEC DRIVE ()
>ELEC SSB OPEN
ELEC UTIL BUS L
ELEC UTIL BUS R
>STBY BUS APU
>STBY BUS MAIN
>STBY POWER OFF
OFF
LIGHT
ISLN
LIGHT
OFF
LIGHT
OFF
LIGHT
ADVISORY MESSAGES
APU battery is discharging
[message inhibited during APU start]
main battery is discharging
battery switch is set to OFF
IDG (1, 2, 3, or 4) drive shaft is disconnected from
engine gearbox and IDG frequency is below 200 Hz
bus tie breaker (1, 2, 3, or 4) is open
[message and light inhibited during autoland]
[message inhibited by ELEC AC BUS ()]
{ IDG (1, 2, 3, or 4) oil pressure is low
OR oil temperature is above 185°C }
AND engine is running
AND drive is connected to gearbox
split system breaker is open
while commanded to close
at least one ELCU on AC bus 1 or 2 is unpowered
due to a fault or manually switched off
at least one ELCU on AC bus 3 or 4 is unpowered
due to a fault or manually switched off
APU standby bus is not powered
main standby bus is not powered
standby busses are not powered
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