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Alert messages are automatically displayed in the upper left corner of the primary engine page. These alert messages are further divided into three levels. 1) Level A-Warning messages indicate an abnormal condition
that requires immediate corrective or compensory action. Warning messages are red in color and are displayed at the top of the alert message list.
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2) Level B-Caution messages indicate an abnormal condition that requires immediate crew awareness with some future compensory action. Caution messages are yellow in color and are displayed below the last warning message.
3) Level C-Advisory messages indicate an abnormal condition that requires only immediate crew awareness. Advisory messages are also yellow in color and are displayed below the last Caution message. Advisory messages are indented one space to distinguish them from Caution messages.
Alert messages are displayed in order of occurrence. The latest occurring message is positioned on the top line of its proper A, B, or C level. Any alert message is cleared from the display when the condition causing the alert is cleared.When a new level A warning message appears, the Warning System provides siren and bell warning aurals and drives the master warning lights (Ref 31-51-00). The Warning System also provides an owl caution aural when a new level B caution message appears, unless inhibited by the engines being shut down. The master caution lights also come on with a new level B message. Level C advisory messages have no aural indications.Level S (status messages) are shown on the right half of the status page. They are only seen if the status page has been selected for display. Status messages, white in color, indicate a condition for which crew awareness is only required at dispatch.Level M (maintenance messages) for all systems are displayed on the right half of the ECS/MSG maintenance data page. They are only seen if the ECS/MSG page has been selected. Maintenance messages, white in color, indicate conditions which do not require flight crew attention. They are generated only to assist the maintenance crew. The maintenance message list also includes a repeat of most of the conditions currently indicated in the status message list.Message Inhibits 1) An Engine Start inhibit is applied to all messages (except
level A; level B L ENG SHUTDOWN, R ENG SHUTDOWN; level B L STARTER CUTOUT, R STARTER CUTOUT; level C L ENGINE STARTER, R ENGINE STARTER; and Master Caution and owl Aural), master caution lights, the beeper tone, and AUTO EVENT displays during either engine start. This inhibit prevents nuisance displays of messages and associated alerts that occur during engine start. The engine start inhibit begins when starter is engaged and ends when engine is running, engine start is aborted, or after 2 min.
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本文链接地址：757 AMM 飞机维护手册 仪表 CHAPTER 31 - INSTRUMENTS 2(26)
