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Electrical system warnings, cautions advisories and status messages are presented on
the EICAS primary display. General views of airplane electrical systems (either AC or
DC) are presented through synoptic diagrams on the EICAS secondary display (after
selecting the appropriate key on the EICAS control panel).
STAT
HYD
AC
ELEC
BLEED
AIR
COND
DC
ELEC
FUEL
FLT
CTRL
SCROLL
EICAS
SYSTEMS SELECT
NORM
MFD 1 MFD 2
AC ELECTRICAL
00
0
V
KVA
HZ
GEN
APU
AC BUS 1
115
15
V
KVA
AC BUS 2
115
12
V
KVA
GEN
2
GEN
1
AC ESS BUS
AC BUS 4
AC BUS 3
115
12
V
KVA
115
15
V
KVA
GEN
3
GEN
4
GX_06_013
EICAS Control Panel
Generator Voltage
Readout
Displays, in VAC, the
generator voltage level.
• Green - 100 - 125
VAC
• Amber - GCU fault
• White - GEN off
• Magenta - Invalid
data.
Generator Load
Readout
Displays, in KVA, the
load on the generator.
APU Generator Frequency Readout
Displays, in Hz, the generator frequency
level.
Generator Output
Flow Line (Lower)
• Green - Generator
is on.
• Blank - Generator
is off.
Generator Output
Flow Line (Upper)
• Green - Generator
line contactor at
generator position.
• Blank - Generator
line contactor at tie
position.
For Training Purposes Only
Sept 04
6-15
P I LOT T R A I N I N G GU I D E
ELECTRICAL
The AC electrical page contains digital readouts of generator output voltage,
frequency (APU only), load in kVA, input/output flow on the bus bars, general status
indications via color logic and the following messages:
• SHED message - Corresponding AC bus has been shed
• AC BUS 1, 2, 3, 4 MAN OFF icon - Corresponding AC bus is isolated
AC BUS 1, 2, 3, 4 MAN OFF status message displayed on EICAS
AC BUS FEED SYSTEM
Each AC bus is normally powered by its own generator through generator line
contactors. In the event of a generator malfunction, the priority system will
automatically provide an alternate generator (feed), to power that bus (APU must be
started to be available to the feed system), through generator transfer contactors.
The AC buses are normally powered by their own generator, but can be powered by
alternate generators in the following descending order:
• AC BUS 1 - GEN 1, GEN 4, GEN 3, GEN 2, APU GEN
• AC BUS 2 - GEN 2, GEN 3, GEN 4, APU GEN
• AC BUS 3 - GEN 3, GEN 2, GEN 1, APU GEN
• AC BUS 4 - GEN 4, GEN 1, GEN 2, GEN 3, APU GEN
• AC ESS BUS - RAT generator (if deployed), GEN 4, GEN 1, GEN 2, GEN 3,
APU GEN. Normal power for AC ESS BUS is generator 4. When the RAT is
deployed and RAT generator is ON, the AC ESS Bus is fed directly from the RAT
generator
AC buses 2 and 3 are automatically load shed when a single generator is powering the
buses.
External AC power will power all AC buses when selected ON and interacts with
other generator power as per APU.
The AC bus feed is displayed on the AC ELECTRICAL synoptic page as follows:
GX_06_014
AC BUS 2 AC BUS 3
SHED SHED
GX_06_015
AC BUS 1 MAN OFF
AC BUS 2 MAN OFF
AC BUS 3 MAN OFF
AC BUS 4 MAN OFF
AC BUS 1
MAN OFF
Note:
A maximum of 3 busses only
can be manually isolated
concurrently.
6-16 For Training Purposes Only
Sept 04
P I LOT T R A I N I N G GU I D E
ELECTRICAL
AC BUS 1
AC ELECTRICAL
0HZ
AC ELECTRICAL
000
V
KVA
HZ
GEN
APU
00
V
KVA
AC BUS 2
115
12
V
KVA
GEN
2
GEN
1
AC BUS 3
115
12
V
KVA
GEN
3
AC BUS 1
AC ESS BUS
AC BUS 4
115
24
V
KVA
GEN
4
AC ELECTRICAL
00
0
V
KVA
HZ
GEN
APU
AC BUS 1
115
12
V
KVA
AC BUS 2
115
12
V
KVA
GEN
2
GEN
1
AC ESS BUS
AC BUS 4
AC BUS 3
115
12
V
KVA
115
15
V
KVA
GEN
3
GEN
4
APU
GEN
1
GEN
4
GEN
3
GEN
2
GEN
GEN 1 GEN 4
　
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