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or greater
Respective TRU/battery is on-line and output is less than
18 VDC or no supply is being provided to respective bus
ELECTRICAL
For Training Purposes Only
May 03
7-49
P I LOT T R A I N I N G GU I D E
DC Synoptic Page - DC Electrical Power Distribution (2 of 2)
Figure 7-41
Description Symbol Condition
P604_07_054
APU BATT
DIR BUS
Bus Bar Outline
Battery voltage is greater than 18 VDC, BATT MASTER
switch ON, and EXT DC not in use
Battery voltage is less than 18 VDC, BATT MASTER
switch ON, and EXT DC not in use
APU BATT
DIR BUS
APU BATT
DIR BUS
MAIN BATT
DIR BUS
Bus Bar Outline
Invalid data
Battery voltage is greater than 18 VDC and BATT MASTER
switch ON
Battery voltage is less than 18 VDC and BATT MASTER
switch ON
Invalid data
MAIN BATT
DIR BUS
MAIN BATT
DIR BUS
MAIN BATT
DIR BUS
APU BATT
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
Table of Contents
For Training Purposes Only
May 03
8-i
P I LOT T R A I N I N G GU I D E EMERGENCY EQUIPMENT
Introduction .........................................................................................................................8-1
Oxygen System.............................................................................................................8-1
Description ..............................................................................................................8-1
Components and Operation ....................................................................................8-1
Controls and Indicators .................................................................................................8-2
Overboard Discharge Indicator(s) ...........................................................................8-2
Flight Compartment.................................................................................................8-4
EICAS Messages..........................................................................................................8-6
Emergency Exits .................................................................................................................8-8
Main Entrance Door ......................................................................................................8-8
Overwing Emergency Exit.............................................................................................8-8
Emergency Egress Lighting ..........................................................................................8-8
Locating Devices.................................................................................................................8-9
Components and Operation..........................................................................................8-9
Emergency Locator Transmitter (ELT)....................................................................8-9
Underwater Locating Devices (ULDs).....................................................................8-9
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