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Crew Alerting Message Pagination
Figure 03.10.20
AURAL/VISUAL WARNING SYSTEM Description Vol. 2 03.10.22
Oct 05/06
CAS Message De-Clutter
The CAS button can also be used to de-clutter the EICAS message stack, should a large number of messages be shown. When selected, the CAS message stack is removed from view and replaced with a white MSGS icon, indicating that CAS messages are being hidden. Warning messages, however, cannot be hidden and always remain in view.
The CAS message stack can be viewed by reselecting the CAS button. On ground, the de-cluttering function can only be carried out when both engines are running. In the air, the function can be carried out at any time, regardless of engine operation. The decluttering function does not cause any new messages to be hidden. Rather, new messages are displayed on initial occurrence as normal.
Should the CAS function of both DCUs fail, a red X is displayed across the full CAS message block.
Crew Alerting Message De-Clutter Figure 03.10.21
EICAS Comparator Monitoring
All of the EICAS warning and caution messages and accompanying aural alerts, issued by one DCU, are compared with the results of the other DCU. An EICAS status message of CAS MISCOMP is displayed, should the two DCUs disagree for a particular message or aural alert.
Each DCU continually cross-checks engine data processed by the other DCU. A caution message of EICAS COMP INOP is displayed, should either DCU circuitry lose this ability to cross check engine data.
Takeoff Configuration Warning
Certain warning messages are triggered by the DCUs, should a takeoff be commenced when the aircraft is not in the proper takeoff configuration. The takeoff configuration warning function is armed on the ground when both thrust levers of both engines are advanced above 70% N1.
The takeoff configuration warning condition is accompanied by a voice warning, EICAS takeoff configuration warning message and flashing MASTER WARNING/CAUTION switch/lights.
AURAL/VISUAL WARNING SYSTEM Description Vol. 2 03.10.23
Oct 05/06
The following table defines the conditions for a takeoff configuration warning annunciation. The warning is automatically removed when the configuration error is corrected.
Takeoff Configuration Warnings
Inhibited EICAS Caution Messages
During the takeoff and landing phases of flight, the DCUs inhibit the display of certain EICAS messages that may be distracting to the flight crew. Generally, these are messages that do not require immediate crew action during takeoff and landing.
Message Inhibit – Takeoff
During takeoff, the DCUs inhibit caution messages that are not considered critical. The takeoff phase, for the purpose of caution message inhibiting, occurs when the following conditions are set:
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Aircraft is on the ground;
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