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through the Avionics Standard Communication Bus (ASCB), to 3 Integrated Avionics Computers
(IAC), to the Display Units (DU).
The 4 dual channel DAUs operate with one channel active and the other channel on standby, with
both channels updating data at the same time.
The ASCB is the principal communications network interconnecting the system components. Data
traffic flow on the ASCB is managed by 3 bus controllers (one bus controller in each IAC). Only one
bus controller is in control at a time, with the other 2 in standby status.
The three IACs, each contain a Symbol Generator (SG) and a Fault Warning Computer (FWC). The
SGs process data from various sources and output the data to the 6 DUs. The FWC compares
sensor input data, verifies all critical display data and displays warning, caution, advisory and status
messages as applicable.
DU 1 DU 2 DU 3 DU 4 DU 5 DU 6
The IACs perform the following functions:
IAC 1 IAC 2 IAC 3
EFIS, EICAS, FWC, CAIMS EFIS, EICAS, FWC, CAIMS EFIS, EICAS, FWC, CAIMS
Tone/Aural generator Tone/Aural generator LASERTRACK (if installed)
Flight Management System Flight Management System FMS 3 (if installed)
Autothrottle Autothrottle
AFCS AFCS
AURAL AND VISUAL WARNINGS
Flight Crew Operating Manual REV 41, Jul 08, 2004
CSP 700−6
Volume 2
03−10−2
CREW ALERTING MESSAGES
The crew alerting system portion of EICAS continually monitors all airplane systems. If an
operationally significant fault occurs on a system, EICAS displays a crew alerting message on the
EICAS display unit. In addition to the display messages, some crew alerts are also indicated by aural
tones, voice advisories, MASTER WARNING and MASTER CAUTION lights.
All crew alerting system messages are divided into one of four categories and in the following priority:
Warning messages are generated when immediate recognition and corrective or
compensatory action is required. They are the most urgent type of crew alerts. They always
appear at the top of the message stack on the EICAS primary display. All warnings cause the
MASTER WARNING lights on the glareshield to flash and have an aural alert consisting of a
unique tone or a triple chime plus a voice advisory. Once acknowledged flashing stops.
L ENG FIRE
Glareshield EICAS Display Aural
"LEFT ENGINE FIRE"
Triple Chime
MASTER
WARNING/CAUTION
WARNING
CAUTION
Warning messages cannot be removed from view, unless the applicable failure has been
rectified. If a failure is rectified, messages which appeared below the deleted message, will
move up one line. When a new fault occurs, the new message will move to the top of the stack.
Caution messages are generated when immediate crew awareness is required and
subsequent crew action will be required. Caution messages appear immediately below the
warnings in the message stack on the EICAS display. All cautions cause the MASTER
CAUTION lights on the glareshield to flash and have an aural alert consisting of a single
chime. Once acknowledged flashing stops .
L ENG SHUTDOWN
Glareshield EICAS Display Aural
Single Chime
GF0310_005
MASTER
WARNING/CAUTION
WARNING
CAUTION
Caution messages can be paged and scrolled from view, using SCROLL knob on EICAS
control panel. If a new abnormal situation occurs, the corresponding caution message will flash
and the remaining messages will remain steady. To view all of the nondisplayed
messages,
turn SCROLL knob on the EICAS control panel. If a new message is posted, it will be
displayed at the top of the stack.
EICAS Control Panel
Scroll Knob
AURAL AND VISUAL WARNINGS
REV 41, Jul 08, 2004 Flight Crew Operating Manual
CSP 700−6
Volume 2
03−10−3
CREW ALERTING MESSAGES (CONT'D)
Advisory messages are generated when crew awareness is required and subsequent crew
action may be required. Advisory messages appear immediately below the cautions in the
message stack on the EICAS display. When a new advisory message appears, it will flash for
5 seconds, then steady. There is no aural alert for advisory messages.
GF0310_007
L REVERSER FAULT
EICAS Display
Advisory messages can be paged and scrolled from view, using SCROLL knob on EICAS
control panel. To view all of the nondisplayed
messages, turn SCROLL knob on the EICAS
control panel.
Status messages are generated to indicate nonnormal
pilot selections and are reminders to
the crew. They are set in the message stack below the advisories. There is no aural alert for
status messages.
GF0310_008
L ENG SOV CLSD
EICAS Display
Status messages can be scrolled from view, using SCROLL knob on EICAS control panel.
　
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