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DIR BUS
ESS BUS and
BATT BUS
Bus Bar Outline
Bus powered
Bus not powered
Invalid data
ESS BUS
ESS BUS
ESS BUS
BATT BUS
BATT BUS
BATT BUS
ELECTRICAL
7-50 For Training Purposes Only
May 03
P I LOT T R A I N I N G GU I D E
EICAS Messages
MESSAGE MEANING AURAL WARNING
(IF ANY)
EMER POWER ONLY ADG is supplying the AC essential bus, and no power is
available from AC BUS 1 or 2. TRIPLE ATTENSON
AC 1 AUTOXFER Respective automatic AC bus tie function has been inhibited because of an overcurrent
AC 2 AUTOXFER condition on the respective AC bus.
AC BUS 1
Respective AC bus is unpowered.
AC BUS 2
AC ESS BUS AC essential bus is unpowered.
APU BATTERY OFF APU battery is less than 18 VDC.
APU GEN OFF APU generator is off-line with the APU running.
APU GEN OVLD Load on the APU generator exceeds 34.5 kVA.
BATTERY BUS Battery bus is unpowered.
DC BUS 1
Respective DC bus is unpowered.
DC BUS 2
DC EMER BUS DC emergency bus is unpowered.
DC ESS BUS DC essential bus is unpowered.
GEN 1 OFF
Respective generator is OFF.
GEN 2 OFF
GEN 1 OVLD
Load on respective generator exceeds 34.5 kVA.
GEN 2 OVLD
MAIN BATTERY OFF Main battery is less than 18 VDC.
AC ESS ALTN AC essential bus is powered by AC BUS 2.
AC UTIL 1 OFF
Respective AC utility bus is unpowered.
AC UTIL 2 OFF
APU BATT CHGR FAIL APU battery is not charging or APU charger has failed.
ESS TRU 1 FAIL
Respective essential transformer-rectifier unit output is less than 18 VDC.
ESS TRU 2 FAIL
MAIN BATT CHGR FAIL Main battery is not charging or main battery charger has failed.
EICAS Messages
Table 7-1

　
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