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(DAU) through the Avionics Standard Communication Bus (ASCB) to 3 Integrated
Avionics Computers (IAC), and finally 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.
GX_07_011
IAC 3
FWC SG
IAC 2
FWC SG
IAC 1
FWC SG
DAU 1
CH A CH B
DAU 2
CH A CH B
DAU 4
CH A CH B
DAU 3
CH A CH B
AIRPLANE DATA
ASCB
DU 1 DU 2 DU 3 DU 4 DU 5 DU 6
For Training Purposes Only
Sept 04
7-13
P I LOT T R A I N I N G GU I D E
ELECTRONIC DISPLAY SYSTEM
The IACs perform the following functions:
CREW ALERTING SYSTEM
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: RED
• Caution messages: AMBER
• Advisory messages: CYAN
• Status messages: WHITE
Red 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 display. All warning
messages cause the MASTER WARNING lights on the glareshield to flash and
generate an aural alert of a triple-chime. Specific warnings are also accompanied by a
voice message. Once acknowledged, by pressing the warning light, the light will
extinguish and the system will re-arm to indicate any additional warning messages.
Failure to re-arm the system will mean that any subsequent CAS Warning Message
will not be announced by the triple chime and Master Warning lights, however, related
voice messages will remain valid.
NOTE
The Stall Warning System is not part of the MASTER WARNING
light system. The approach of an aerodynamic stall will be
indicated by a separate warning indication.
IAC 1 IAC 3 IAC 2
EFIS, EICAS, FWC, CAIMS EFIS, EICAS, FWC, CAIMS EFIS, EICAS, FWC, CAIMS
Tone/Aural generator LASERTRACK (if installed) Tone/Aural generator
Flight Management System FMS 3 (if installed) Flight Management System
Autothrottle Autothrottle
AFCS AFCS
7-14 For Training Purposes Only
Sept 04
P I LOT T R A I N I N G GU I D E
ELECTRONIC DISPLAY SYSTEM
MASTER WARNING/MASTER CAUTION LIGHTS
Two MASTER WARNING switch/lights come on flashing when any EICAS warning
message occurs. The lights remain on as long as the warning exists. Pushing either
MASTER WARNING switch/light extinguishes both MASTER WARNING lights for
the duration of that warning and resets the lights for future warnings.
Pushing the MASTER WARNING also silences the related aural warnings except for
the following cases:
• Configuration warnings
• Gear horn
Two MASTER CAUTION switch/lights flash when any caution occurs. Pushing
either MASTER CAUTION switch/light extinguishes both MASTER CAUTION
lights for the duration of that caution and resets the lights for future cautions.
Certain aural alerts/voice messages are not part of MASTER WARNING/MASTER
CAUTION light alerting system. The following aural alerts/voice messages will not
trigger a MASTER WARNING/MASTER CAUTION light:
- Stall warnings - Trim clacker
- EGPWS/TCAS (voice and aurals) - Autopilot disconnect cavalry charge
- Overspeed continuous horn (A-Chord) - Gear horn
MINIMUMS
RAD BARO IN Hpa
NAV SRC BARO SET
BRG V/L FMS BRG
HSI
Honeywell
PUSH STD
MINIMUMS
RAD BARO IN Hpa
NAV SRC BARO SET
BRG V/L FMS BRG
HSI
Honeywell
PUSH STD
MASTER
WARNING/CAUTION
ROLL SPLRS
PLT CONT
ROLL
SEL
PLT
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