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Electrical System.
The circuit breaker STATUS page will automatically appear anytime a circuit breaker trips (CB TRIP
message appears on EICAS). The STATUS page can be selected using STATUS page select key.
GF0710_010
STAT SYS BUS PREV CNTL TEST
PAGE
NEXT
PAGE
EMER
CNTL
BUS
CIRCUIT BREAKER − SYSTEM 1/2
CIRCUIT BREAKER SYSTEM
H STAB TRIM 1
H STAB TRIM 2
FUEL COMP B
DISPLAY UNIT
RAD ALT 1
OUT
OUT
OUT
2 LOCKED
TRIP
LOCKED − Circuit breaker
has been locked by
CCBP − Thermal
circuit breaker located
on Cockpit Circuit
Breaker Panel.
FUEL COMP B − Circuit
breaker identification
DC 1 − BUS location of
affected circuit breaker.
ACPC − Thermal circuit breaker
located on the component within ACPC.
OUT − Circuit breaker
has been selected out.
TRIP − Circuit
breaker has tripped.
1 − Trip counter.
Automatically displays the
number of times a circuit
breaker has tripped.
CIRCUIT BREAKER − STATUS 1/1
DISPLAY UNIT 1 DC ESS LOCKED
CCBP
H STAB TRIM 1 AC 1 LOCKED
H STAB TRIM 2 AC ESS OUT
FUEL COMP B DC ESS OUT
RAD ALT 1 DC 1 TRIP
ACPC
maintenance personnel.
1
2
AC1
AC ESS
DC ESS
DC ESS
DC 1
ACPC
CCBP
2
1
BRT
ELECTRICAL
Flight Crew Operating Manual REV 41, Jul 08, 2004
CSP 700−6
Volume 2
07−10−10
ELECTRICAL MANAGEMENT SYSTEM (CONT'D)
Effectivity:
· Airplanes 9002 thru 9122 not incorporating Service Bulletin:
· SB 700−24−045, AC and DC Power Distribution − Unit Change and Activation of Build 4
Electrical System.
The linking function is not available.
The EMS CDUs are designed to be linked. When linked, a CDU (secondary) is operating exactly as
the controlling CDU (primary). A primary CDU controls itself and, when linked, the other CDU. The
following table identifies the possible relationships:
Link State EMS CDU
Pilot Copilot
Initial Power Up Secondary Secondary
Pilot CDU Linked Secondary Primary
Copilot CDU Linked Primary Secondary
Both unlinked Primary Primary
A CDU is considered secondary in the following conditions:
· At initial power up,
· A CDU display is turned on by pressing a function control key on the other CDU (except PREV
page key).
A CDU is considered primary in the following conditions:
· When any key of a secondary CDU is pressed,
· When in the TEST page, a selection is made on the other CDU,
· When the STAT page is selected.
ELECTRICAL
REV 41, Jul 08, 2004 Flight Crew Operating Manual
CSP 700−6
Volume 2
07−10−11
ELECTRICAL MANAGEMENT SYSTEM (CONT'D)
An “S“ character is displayed in the lower left corner of the screen of a secondary CDU and an “M”
character in the lower left corner of the screen of a primary CDU.
GF0710_012
M − Linked CDU indication
STAT SYS BUS PREV CNTL TEST
PAGE
NEXT
PAGE
EMER
CNTL
BUS
CIRCUIT BREAKER − SYSTEM 1/2
CIRCUIT BREAKER SYSTEM
RAD ALT 1
H STAB TRIM 1
H STAB TRIM 2
FUEL COMP B
DISPLAY UNIT 1
TRIP
OUT
OUT
OUT
LOCKED
DC 1
AC 1
AC ESS
DC ESS
DC ESS
ACPC
CCBP
M
BRT
ELECTRICAL
Flight Crew Operating Manual REV 41, Jul 08, 2004
CSP 700−6
Volume 2
07−10−12
ELECTRICAL MANAGEMENT SYSTEM (CONT'D)
Circuit breakers can be acknowledged or acknowledged and reset, using the line select keys.
Most recent tripped circuit breaker will automatically highlight. To select another circuit
breaker, use the line select key, this acknowledges and highlights the displayed breaker.
Once acknowleged or reset, the CB TRIP message goes out.
Select activation key adjacent highlighted circuit breaker.
removed from STATUS page
list, after successful reset and
a new status list is selected.
CB TRIP message goes out.
NOTE
Will appear if an attempt to
reset is carried out on a
thermal circuit breaker.
A thermal breaker cannot be
reset using EMS CDU. The
affected circuit breaker can
only be manually reset at its
location.
THERM CB CAN’T BE CHANGED FROM CDU.
2
1
GF0710_013
STAT SYS BUS PREV CNTL TEST
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PAGE
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