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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.
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
Rev 3, Apr 25, 2005 Flight Crew Operating Manual Volume 2
ELECTRICAL
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.
The reset circuit breaker will automatically be removed from STATUS page list, after successful reset and
GF0710_013
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.
Volume 2 Flight Crew Operating Manual Rev 3, Apr 25, 2005
ELECTRICAL
AC SYSTEM EICAS MESSAGES
APU GEN OVLD
Indicates an overload on the APU generator.
CB TRIP AC FEED
Indicates that a circuit breaker for an AC feeder/AC cabin feeder has tripped.
ELEC SYS FAIL
(on ground only) Indicates that a major fault has been detected in the electrical system.
GEN 1 (2)(3)(4) OVLD
Indicates an overload on affected generator channel.
RAT GEN FAIL (on ground only)
Indicates that a fault has been detected in the RAT generator system during built in test (BIT).
EMER PWR ONLY
Indicates that RAT is powering the AC ESS BUS or the battery is powering the BATT BUS.
AC BUS 1 (2)(3)(4) FAIL
Indicates that affected bus is not powered or has a fault.
AC ESS BUS FAIL
Indicates that AC ESS BUS is not powered or has a fault.
APU GEN OVERHEAT
Indicates that the APU generator oil has overheated.
CB TRIP DC FEED
Indicates that a circuit breaker for a DC feeder/DC cabin feeder has tripped.
GF0710_016b
Rev 11, Apr 17, 2006 Flight Crew Operating Manual Volume 2
ELECTRICAL
AC SYSTEM EICAS MESSAGES (CONT'D)
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